[Ginolebon_]

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

I checked out your website, I seen the part # you had listed for the diff but I unfortunately can’t seem to find one with that part number, the other 3.27 diffs that are from the same years won’t work? Only that part # will work for our ATS? All the 3.27 look identical to each other at least in pictures. Here’s some pictures of the ones I have found so far. That don’t match up to the part # you have on your website but these look identical.

Pardon Our Interruption...

camaro differential 6 th gen from 2021 Camaro 1ls 4 Cyl 84371223 3.27 RATIO | eBay

300 MILE camaro differential 6 th gen from 2021 camaro.

www.ebay.com

 

[ProjectLtg]

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.

 

[Ginolebon_]

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

 

[BKC1]

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.

 

[ProjectLtg]

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

 

[BKC1]

Ats v differentials are totally different not possible

I'm not convinced--I haven't seen pictures of the internals. I have a brand-new 2.85 ATS-V differential (spare) if you ever want to dig into this further.

 

[mpreissner]

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.


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[BKC1]

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.


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

 

[Codyspeer53]

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

 

[TheDIY_Mech]

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.

 

[ProjectLtg]

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.


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Flanges GM (84080684)

 

[ProjectLtg]

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.

 

[Waynezx10]

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

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

 

[Lifespeed]

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.

 

[robertorolfo]

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.

 

[rand49er]

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.

And here I thought I was alone. The thought process is not conveyed in a step-by-step fashion, terminology is sometimes undefined, photos are difficult to see what's going on, etc. These guys know what they're doing and have managed to accomplish a confusing task and no criticism intended, but I'd be very hesitant to take this on without clarification at several points.

At my age, confusion at new things is a constant battle.

 

[brandon.sullivan1742]

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?

 

[dbphelps]

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.

 

[Lifespeed]

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.

It's not correct that brake-grabbing Is the "same" as LSD. I have wondered if stability and ABS needs to behave differently in the presence of LSD.

 

[dbphelps]

It's not correct that brake-grabbing Is the "same" as LSD. I have wondered if stability and ABS needs to behave differently in the presence of LSD.

As far as how the car is engineered, it is "effectively" the same. What that means is the systems are developed to offer the same level of safety and performance. "Old school" thinking is the issue here. People "think" they need a LSD to have both rear wheels have traction, and that is not the case. As the torque levels increase in regards to performance it beomces harder and harder for a open diff to maintain the same level of performance, thus why they have LSD and eLSD rear ends. The electronic LSD actually has the best of all worlds, it can be disengaged and act like a open diff and when asked can reach near locker levels depending on the unit and design.

So, as power levels increase the ability for the computer to effectively allow the open rear to perform like a LSD actually decreases. Thus why someone might NEED a LSD or even better, a eLSD.

Also, yes the computer systems that provide for stability and ABS ALL need to be tuned to handle a LSD or eLSD or even a open diff. It all comes down to the integration of the systems and as such you cannot just put a LSD in to a open-diff configured system and expect it to operate properly. That was my point. And considering these vehicles are NOT strickly road-race/track vehicles and are driven on the street, it is HIGHLY irresponsible to change a system that provides for EVERYONES safety by swapping a open diff for a LSD without reprogramming, and since such programming is beyond anyone at this time (GM never developed an AWD LSD system for these cars) that means no one has a properly tuned setup that CAN be used with these cars "safely". That was my big issue when some people put Camaro LSD diffs in AWD ATSes without disabling permanently stabilitrak or ABS. I can only imagine the type of dynamics that would be seen if you attempt to hard brake in the rain and ABS kicks in while the LSD is trying to work both rear wheels... I can imagine major stability issues and the possibiliity of the car swinging around wildly if you are in any way trying to maneuver around an obstacle in a panic... Talk abotu making a situation even further out of control than it already is.

These systems are VERY well designed and tuned, and they expect certain parts to operate the way they are designed to operate. Thus switching from a open diff to a LSD changes the way the car responds when the computer "does it's thing".