Thanks for sharing that with us.

 

Awesome write-up. How's the reliability on the 3.73? Do the axle seals tend to leak like the ATS 3.27?

 

I had two 3.27 differentials and I never had a single issue. 3.27 SDL and LSD. The 3.73 no issue. I will say, the Cadillac ATS 3.27 breather on the differential is in a bad location, thus why I can see why water or dirt, and dust would get into the differential and over time west the gears out. The camaro 2.0 3.27 amd SS 3.73 breather are located at the very top out of the way of debris.

 

Keeping this area clean is the key for preventing failures, and avoiding driving though deep water.you can see the dirt buildup around the breather. (Nipple)

 

Question, was this swap done just for the just the gear change? Was it to add a LSD and a gear change?

 

I believe he already had the 3.27 LSD and wanted higher gears.

Also, thank you for this post! This will be super useful to the rest of the community.

 

UPDATE:

Got the 3.73 differential in. Installed new flanges from a Camaro 3.27 lsd. GM also thought it was a good idea to make the 3.73 SS diff Companion Flange bolts mount up just a little bigger then the already existing 3.27 Companion Flange that connects to driveshaft. We made it work. Just carefully notched out the holes and cut a little off the guides where the bolts go into the Companion Flange. Made sure it was centered. Overall very please with results. I noticed 2/3 miles per gallon better gas mileage and don’t have to down shift when passing cars, and going over the skyway bridge. Big bridge. Lol

Matt and myself figured out what needed for the ATS to get the 3.73 swap. If you have a Camaro and want to upgrade to a 3.73 it’s a lot easier then the ATS. Camaro 3.27 flanges swap easy into the 3.73. If you want to upgrade the to SS CV axles just buy SS CV axles. The spine on the Camaro’s 2.0 and SS have 33 spline. They fit right in. You could also upgrade the flanges on your 3.27 to SS Flanges and the SS CV axles will work. The 3.27 flanges won’t mount to the SS CV axles. 3.27 flanges are a smaller diameter then the SS flanges. These differentials are hard to come by.

As for the ATS you can install the 3.73 just keep in mind the flanges don’t interchange. You have to get flanges from the 3.27 manual camaro 2.0. Buy the flanges separately to swap to SS 3.73 successfully. You can use the same CV axles as stock or the manual cars CV axles (there thinker then auto’s) but you CANT upgrade ATS to SS CV axles because the ATS has a 30 spline count and they won’t fit. So we spent half the day seeing if SS axles will fit the ATS, took a trip to Tracy Lewis shop and took apart a v6 differential. That’s totally different beast...😆. So in order to make it work, I ordered some flanges for the Camaro 3.27 manual to make this work. I heard many talk about this subject but never shared properly with others. It was something that’s been throw out there a few times and now it’s clear what needs to be done for the ATS to get a 3.73 SS differential. These differentials all mount the same way in ATS, camaro’ 2.0, and SS 6.2 manuals. We figured it out. Hope this helps anyone that’s looking into it.

Thanks for the write up. From reading through it I can't tell if the problems you had with the flanges being because it was a 3.73 instead of a 3.27 or if it was because of the Camaro part vs. ATS part. I think stock ATS is 3.27? My ATS came with an LSD, if it fails, what would be needed to replace it with the Camaro LSD 3.27? I think there would be a lot more options (aftermarket or junk yard Camaro) and possibly just being "Camaro" would make it cheaper.

Looks like the V8 Camaro diff isn't a simple solution because of the axles.

 

If your current lsd fails you can buy a camaro manual 3.27 differential and it bolt right in. The ats and the camaro are to different designes but all mounts the same way. If you own a camaro 3.27 and want to up grade SS 3.73. You just swap the flanges from your stock 3.27. The ats flanges wont swap with the SS 3.73 thus why you have to purchase the flanges separately 3.27 from a camaro.

 

hello, I’m trying to help my dad get his 2013 ATS 2.0 fixed, it’s auto. I want to do the 3.27 Camaro diff because it’s a lot cheaper and seems to be a solid diff with no issues for him and the issue I’m having is those diffs dont have flanges, so are you suppose to use the ATS flanges off the old diff and put them into the Camaro manual 3.27 diff in order for it to work? Because when I look on eBay they all show up as 2010-2015 and they don’t have flanges. The 2016-2021 diffs have the flanges but idk if that is the diff you are talking of, any help would be appreciated.

 

hello, I’m trying to help my dad get his 2013 ATS 2.0 fixed, it’s auto. I want to do the 3.27 Camaro diff because it’s a lot cheaper and seems to be a solid diff with no issues for him and the issue I’m having is those diffs dont have flanges, so are you suppose to use the ATS flanges off the old diff and put them into the Camaro manual 3.27 diff in order for it to work? Because when I look on eBay they all show up as 2010-2015 and they don’t have flanges. The 2016-2021 diffs have the flanges but idk if that is the diff you are talking of, any help would be appreciated.

Go check out projectltg.com go to installs and scroll down to 3.73 differential. It the same install as 3.27.

View attachment 619191
This one looks a little different from the one you posted. It's from a Camaro 3.27 ratio. Any thoughts on this?

That will not work.

Sorry to bring up an old thread, but I just the same diff to swap into a 2015 ats and gm has no 2.0 camaro flanges in the country 😅 any help on where to get some ? Thanks . Dan from st Pete Fl

Ot sucks. So many people have done this swap now, now their no extras flanges. They didn’t give you a ETA?

 

Don't have to downshift when passing cars, what's the fun in that? haha jk great info thanks for sharing!

 

Read post, as original poster wrote about doing this.

Roy

 

Read post, as original poster wrote about doing this.

Unless I'm missing something (possible), the original post talks about putting a 3.73 from a Camaro SS into an ATS. We are talking about putting the 3.27 from the Camaro into an ATS with 3.27 LSD.

 

I love this. Can some one post photos in the difference of flanges? And where can I find what stock gears I have in my ATS? Or are all 2.0t rwd ats gears the same?

 

UPDATE:

Got the 3.73 differential in. Installed new flanges from a Camaro 3.27 lsd. GM also thought it was a good idea to make the 3.73 SS diff Companion Flange bolts mount up just a little bigger then the already existing 3.27 Companion Flange that connects to driveshaft. We made it work. Just carefully notched out the holes and cut a little off the guides where the bolts go into the Companion Flange. Made sure it was centered. Overall very please with results. I noticed 2/3 miles per gallon better gas mileage and don’t have to down shift when passing cars, and going over the skyway bridge. Big bridge. Lol

Matt and myself figured out what needed for the ATS to get the 3.73 swap. If you have a Camaro and want to upgrade to a 3.73 it’s a lot easier then the ATS. Camaro 3.27 flanges swap easy into the 3.73. If you want to upgrade the to SS CV axles just buy SS CV axles. The spine on the Camaro’s 2.0 and SS have 33 spline. They fit right in. You could also upgrade the flanges on your 3.27 to SS Flanges and the SS CV axles will work. The 3.27 flanges won’t mount to the SS CV axles. 3.27 flanges are a smaller diameter then the SS flanges. These differentials are hard to come by.

As for the ATS you can install the 3.73 just keep in mind the flanges don’t interchange. You have to get flanges from the 3.27 manual camaro 2.0. Buy the flanges separately to swap to SS 3.73 successfully. You can use the same CV axles as stock or the manual cars CV axles (there thinker then auto’s) but you CANT upgrade ATS to SS CV axles because the ATS has a 30 spline count and they won’t fit. So we spent half the day seeing if SS axles will fit the ATS, took a trip to Tracy Lewis shop and took apart a v6 differential. That’s totally different beast...😆. So in order to make it work, I ordered some flanges for the Camaro 3.27 manual to make this work. I heard many talk about this subject but never shared properly with others. It was something that’s been throw out there a few times and now it’s clear what needs to be done for the ATS to get a 3.73 SS differential. These differentials all mount the same way in ATS, camaro’ 2.0, and SS 6.2 manuals. We figured it out. Hope this helps anyone that’s looking into it. View attachment 594211 View attachment 594212 View attachment 594213 View attachment 594226 View attachment 594227

Sorry to bring up an old thread, but I just the same diff to swap into a 2015 ats and gm has no 2.0 camaro flanges in the country 😅 any help on where to get some ? Thanks . Dan from st Pete Fl

 

UPDATE:

Got the 3.73 differential in. Installed new flanges from a Camaro 3.27 lsd. GM also thought it was a good idea to make the 3.73 SS diff Companion Flange bolts mount up just a little bigger then the already existing 3.27 Companion Flange that connects to driveshaft. We made it work. Just carefully notched out the holes and cut a little off the guides where the bolts go into the Companion Flange. Made sure it was centered. Overall very please with results. I noticed 2/3 miles per gallon better gas mileage and don’t have to down shift when passing cars, and going over the skyway bridge. Big bridge. Lol

Matt and myself figured out what needed for the ATS to get the 3.73 swap. If you have a Camaro and want to upgrade to a 3.73 it’s a lot easier then the ATS. Camaro 3.27 flanges swap easy into the 3.73. If you want to upgrade the to SS CV axles just buy SS CV axles. The spine on the Camaro’s 2.0 and SS have 33 spline. They fit right in. You could also upgrade the flanges on your 3.27 to SS Flanges and the SS CV axles will work. The 3.27 flanges won’t mount to the SS CV axles. 3.27 flanges are a smaller diameter then the SS flanges. These differentials are hard to come by.

As for the ATS you can install the 3.73 just keep in mind the flanges don’t interchange. You have to get flanges from the 3.27 manual camaro 2.0. Buy the flanges separately to swap to SS 3.73 successfully. You can use the same CV axles as stock or the manual cars CV axles (there thinker then auto’s) but you CANT upgrade ATS to SS CV axles because the ATS has a 30 spline count and they won’t fit. So we spent half the day seeing if SS axles will fit the ATS, took a trip to Tracy Lewis shop and took apart a v6 differential. That’s totally different beast...😆. So in order to make it work, I ordered some flanges for the Camaro 3.27 manual to make this work. I heard many talk about this subject but never shared properly with others. It was something that’s been throw out there a few times and now it’s clear what needs to be done for the ATS to get a 3.73 SS differential. These differentials all mount the same way in ATS, camaro’ 2.0, and SS 6.2 manuals. We figured it out. Hope this helps anyone that’s looking into it. View attachment 594211 View attachment 594212 View attachment 594213 View attachment 594226 View attachment 594227

This one looks a little different from the one you posted. It's from a Camaro 3.27 ratio. Any thoughts on this?

 

I apologize. I must be getting too old to decipher this stuff. My head just swirls in a fog when I read those instructions. Let's try this.

So, I'm an ATS owner in need of a replacement diff because mine's toast. I've heard that the 3.27 Camaro 2.0 diff will work but there is an issue with the flanges not being compatible with my ATS axle flanges. I don't want to do the 3.73 diff as I don't want to change the final drive ratio nor do I want to correct my speedometer for the 14% increase is engine speed for a given vehicle speed. I just want to do a 3.27 diff. Now, I've got some clarifications I need to have cleared up.


1) Is there at difference between the earlier 3.27 Camaro diff (2010-2015) and the later (2016+) one and do I care? Can I buy either one from eBay, my local junkyard, the diff aisle at O'Reilly's, or wherever?

2) My original diff is limited-slip and I want an LSD as a replacement. Can I just swap out the clutch packs into the "new" Camaro diff?

3) If I do get the proper year or version 3.27 Camaro diff to put in my ATS, do I need 30-spline flanges and if so which ones and what is the part number(s) I need to order? Also, my car is a manual RWD ATS; do I need a 3.27 Camaro manual diff?

4) When I modify the driveshaft coupler as mentioned in the instructions and it has to be "centered" when the driveshaft is bolted to the pinion flange, how much risk is there in NOT getting it centered and creating an imbalance which results in a driveline vibration?

5) Is there anything I didn't ask that I should've asked?


Thanks!

 

Thanks for links👍🏻. They do look like they would work. As long as they fit the 2016 up camaro 2.0, they will work on the ats but remember you have to modify the companion flange and decoupler. Not hard. If your using your stock axles they should work with the flanges. Measure center bolt to center bolt on the flange then compare them to the one your buying. Ask the buyer to measure them and send a pic to you. That way you have confirmation.

 

thank you for your help, it is really appreciated!!!! I will keep you posted so that way you can update your site to help anyone else in need

 

Hey, if anyone takes one of those 3.27 differentials apart, please post the pictures. I've been wondering if the gearset is swappable into the ATS-V diff. The case designs are really similar, so it's not impossible. We've only got 2.85 and 3.73 factory options.

 

Ats v differentials are totally different not possible

 

The carrier is a different size. You can’t swap gears from one size carrier to a different size carrier. You need a ring gear sized for the right carrier. Doesn’t mean you can find some aftermarket ring/pinion gears in the ratio you want, but you cannot swap gears between different carriers.


Sent from my iPhone using Tapatalk

 

The carrier is a different size. You can’t swap gears from one size carrier to a different size carrier. You need a ring gear sized for the right carrier. Doesn’t mean you can find some aftermarket ring/pinion gears in the ratio you want, but you cannot swap gears between different carriers.


Sent from my iPhone using Tapatalk

That's fair. I wasn't aware that the carrier was different. Thanks for explaining.

 

Just curious will the camaro 3.27 rwd diff swap work for a 2016 luxury coupe 2.0t awd???

 

Ot sucks. So many people have done this swap now, now their no extras flanges. They didn’t give you a ETA?

Hey bro I appreciate your write up on swapping the Camaro 2.0 diff into the ATS. Such a great help. I was hoping you had a part number for the Camaro 2.0 manual flange. I cannot seem to find the part number. I've searched on the gm parts websites using a VIN from a Camaro 2.0 manual trans but it always bring me up automatic parts. Hope you can help. Thanks.

Also just so you have some background on what I'm doing. My 2018 ATS rear diff broke. I bought a 3.27 ratio rear diff from a 2017 Camaro 2.0 automatic. The flanges don't work for the ATS axels. So I'm hoping to just buy the flanges for the Camaro 2.0 manual and then I'll be good. But I can't seem to find the part number for these to order them.

 

A lot of your questions can be explained on ProjectLtg.com Under installs. Scroll down to differential. All part #’s are posted on the site and here.
If you just want a 3.27 differential you won’t need the flanges. But you need the axles 2016+ Cadillac ATS Manual 2.0

Doesn’t matter if you install a 3.27? Or a 3.73 differential? You have to modify it to fit the Cadillac ATS. (same procedure). You will need a 2016-up differential from a manual camaro 2.0.
You will need Cadillac ATS manual axles. Pic ⬇

hope this helps.

 

Do you have any idea if this can be done in a 2014 CTs 3.45 ratio

 

UPDATE:

Got the 3.73 differential in. Installed new flanges from a Camaro 3.27 lsd. GM also thought it was a good idea to make the 3.73 SS diff Companion Flange bolts mount up just a little bigger then the already existing 3.27 Companion Flange that connects to driveshaft. We made it work. Just carefully notched out the holes and cut a little off the guides where the bolts go into the Companion Flange. Made sure it was centered. Overall very please with results. I noticed 2/3 miles per gallon better gas mileage and don’t have to down shift when passing cars, and going over the skyway bridge. Big bridge. Lol

Matt and myself figured out what needed for the ATS to get the 3.73 swap. If you have a Camaro and want to upgrade to a 3.73 it’s a lot easier then the ATS. Camaro 3.27 flanges swap easy into the 3.73. If you want to upgrade the to SS CV axles just buy SS CV axles. The spine on the Camaro’s 2.0 and SS have 33 spline. They fit right in. You could also upgrade the flanges on your 3.27 to SS Flanges and the SS CV axles will work. The 3.27 flanges won’t mount to the SS CV axles. 3.27 flanges are a smaller diameter then the SS flanges. These differentials are hard to come by.

As for the ATS you can install the 3.73 just keep in mind the flanges don’t interchange. You have to get flanges from the 3.27 manual camaro 2.0. Buy the flanges separately to swap to SS 3.73 successfully. You can use the same CV axles as stock or the manual cars CV axles (there thinker then auto’s) but you CANT upgrade ATS to SS CV axles because the ATS has a 30 spline count and they won’t fit. So we spent half the day seeing if SS axles will fit the ATS, took a trip to Tracy Lewis shop and took apart a v6 differential. That’s totally different beast...😆. So in order to make it work, I ordered some flanges for the Camaro 3.27 manual to make this work. I heard many talk about this subject but never shared properly with others. It was something that’s been throw out there a few times and now it’s clear what needs to be done for the ATS to get a 3.73 SS differential. These differentials all mount the same way in ATS, camaro’ 2.0, and SS 6.2 manuals. We figured it out. Hope this helps anyone that’s looking into it.

Is it just me or is this a little hard to follow? We appear to be discussing at least three different permutations of axles, flanges, diff splines and two different models of car. Reads like it is clear in the OP mind what goes with what as they just did the work, but maybe not communicated as clearly to others as it could be.

 

I'm with you. I absolutely appreciate their effort to share what they have done, but there seem to be a lot of permutations of parts combinations, and not of it seems definitive or particularly clear.

 

Hi, just bought a ats 2.0t coupe looking to make the rear end posi, So to be clear on this. You cannot change in the performance trim diff (LSD) for the stock 8at differential?

 

The LSD is incompatible with the Stabilitrak and ABS systems. They BOTH end up being used to make the "open diff" your car comes with the equivalent of a limited slip.

They do this by monitoring which wheel is spinning and applying the brakes to the opposite wheel, which causes the wheel that is spinning to stop and the non-spinning one to get traction. If you have AWD it does this for the rear AND the front.

Different technology, same result. In other words, there is nothing to be gained going LSD and since it is mechanically coupling the wheels to do the same thing, the computer basically physically fights with it to make it all work. You run the risk of losing control when Stabilitrak is attempting to control slipping and the ABS system is no longer fully functional as you have coupled the rear wheels and it is not expecting that. The ECM is programmed for open differentials, not limited slip.

 

Thank you, just sucks that I have to come to terms with it. I just wanted it as a burnout car/slide/autocross. I bought it very cheap and it's a 1 owner coupe rwd. I will most likely do a tune, dp, inlet tube, and a fluid damper. Call it a day.

 

Skip the Fluidamper... Not needed and they need to be rebuilt after a number of years/miles. The stock damper is fine for these engines.

Also, you can't do burnouts in these vehicles... The ECM program (notice I said program, not tune) is written in such a way that it prevents excessive loading of the driveline, ie, slippage and torque-spikes. It cannot be "tuned out" and it is done as these are not meant to be abused like that. Basically they are the epitomy of the "engineered to maximize durability of minimally built parts" mantra, which also ends up equating to "good fuel efficiency" as well, which is the actual excuse they use.

 

This is why I've been fortunate to have LSD and eLSD in my Cadillacs, I specifically looked for it at the time of purchase. It cost more to buy the cars with that trim level.

Intuitively it makes sense stability control integrates configuration knowledge of open/LSD, but I've neither heard the specifics nor the tuning configuration possibilities, if any. Probably none for SC.

 

Also, you can't do burnouts in these vehicles... The ECM program (notice I said program, not tune) is written in such a way that it prevents excessive loading of the driveline, ie, slippage and torque-spikes. It cannot be "tuned out" and it is done as these are not meant to be abused like that. Basically they are the epitomy of the "engineered to maximize durability of minimally built parts" mantra, which also ends up equating to "good fuel efficiency" as well, which is the actual excuse they use.

Of course a LSD rear end will. I was talking about OPEN DIFFERENTIAL rear ends, which is what ALL AWD ATSes have for both front and rear.

The LSD rears are used in the RWD varients. No one is arguing that, or that LSDs apply power to both wheels.

There was no mention of AWD in the above comment. You just said “you can’t do burnouts in these vehicles.”

The open diff RWD cars will do burnouts as well. Whether it’s one wheel or multiple wheels spinning, it’s still a burnout.

 

Sorry to jump on an old thread but, just to confirm. If I have a 2013 base model rwd I cannot swap in a Camaro diff in order to achieve posi?

 

My understanding is stability control needs to know about limited-slip vs. open. As seems to often be the case there is electronic involvement. The days of simple engine/transmission/differential swaps are long gone.

 

Hi all,

I think I am in the same situation that most ATS owners reading this thread are in. The diff in my 2018 2.0 6MT is in the process of going out, and I just want to fix it without paying the dealer $3000 and waiting 6 months for my parts to come in.

To that end, I just ordered a used diff assembly from a 2017 Camaro 3.6 6MT to swap in (part number is 86827953, interchangeable with the Camaro 2.0 6MT). I'm going for the same ratio (3.27) and LSD like original. I believe I have found the right part to do that. I've been referencing this chart of all Camaro differential configurations: 2016+ Transmission/Differential Information - CAMARO6

My question is this:

I don't know if the diff assembly I bought for the Camaro includes the axle flanges. Does anyone know if the ATS axle flanges (RWD 6MT LSD) are compatible with the 3.27 LSD Camaro diff? Thanks all for the help and I will be reporting back after I'm done with the install in a couple weeks.