Cadillac Owners Forum banner

1 - 20 of 22 Posts

·
Registered
Joined
·
169 Posts
Discussion Starter #1
Just bought a maggie. It was suppose to get installed wednesday at Stillen. However, my car had plans of its own. The casing from my differential is not matched up on both sides and when Cadillac took it apart, they said it was soup inside. I'm running 20 inch wheels and they think that could be the problem. I'm having second thoughts about the blower. Does anyone have 19's w/ low profile tires that are the same height as the stock size? What is your tire size?
 

·
Registered
Joined
·
158 Posts
blackonblackonblack said:
I'm running 20 inch wheels and they think that could be the problem.
:helpless: I would like to see them prove that with physics. Unless the rotating mass of your new tires/wheels is more then the rotating mass of you stock tires/wheels it is physically impossible. Then I would point out the specs on that diff including the HP and torque it can handle according to the MFG and ask them what torque and HP the car makes. According to the specs from the MFG that diff should NOT be in our car!

This is starting to become stupid. :rant2:
 

·
Registered
CTS-V
Joined
·
1,192 Posts
Like MacOSR said. If the wheels were a lot heavier they could be a factor but I doubt that's a valid reason in your case. For some reason certain V's seem to blow out there rear diffs more easily than others. The good news is that you should recieve the new '06 rear diff, which should be able to handle the power without a problem.

I believe if you had wheels that were over 22" you're supposed to make changes to your suspension, brakes, hubs... but you didn't. Just try to make sure they put the new rear diff in and not the old one. The new diff has a different part number and it was posted in this forum a week or two ago.
 

·
Registered
2004 CTS-V
Joined
·
1,627 Posts
BlackonBlack,

I am in the market for some 19s and I found a combination that is very close to the stock rolling diameter. You should be able to see the numbers in my signature block. All tire/wheel sizes are within 2% of stock rolling diameter.
 

·
Registered
Joined
·
169 Posts
Discussion Starter #6
I think i'm going to sell my asanti 20's and buy some HRE 19's. Couldn't work out better with the price break between 19's/20's. The service manager is going to see if he can get the 06 diff. I pretty much told him that if they were to put the same one in, i'd be back in a month. How do Lingenfelter and More manage the 425ci stroker kit w/ 500 rwhp? Everything about the rear end of the V sucks. The wheel hop is unbearable and it seems differentials are replaced more than tires.
 

·
Registered
Joined
·
2,874 Posts
THe only difference that tire profile makes is ride quality and handling. The diff is in a resilent mount. As long as the tire OD is the same it doesent mean squat. Im running 245 40 19 and 285 35 19. The OD is just about on the nose so no ABS /speedo issues. If you are running 22's with rubber bands and the OD is correct any BS you are handed is BS. JMO
 

·
Registered
CTS-V
Joined
·
1,621 Posts
blackonblack,
First, that sucks that your diff is busted. Second, lasstss is correct. As long as the diameter of your current 20's are within stock, you should be ok. One way to check, is by going to this site. This is what I use to find the correct tire size for what I want to do http://www.miata.net/garage/tirecalc.html.

Third, if you want to sell your Asanti's, let me know. Shoot me a PM. ;)
 

·
Registered
Joined
·
1,685 Posts
MCaesar said:
Don't you think that shorter, stiffer sidewalls put more strain on the driveline because they don't flex as much?
Not at all. Tire sidewall flex is very minimal, definately not enough to begin to affect the driveline. The sidewalls on the stock 18" runcraps are very stiff, lets not forget.
 

·
Registered
'04V, '05V, '06SRT8, '10V, '13ZL1, '12 V, '16 Z06 SC757
Joined
·
6,440 Posts
My last trip to my NEW and IMPROVED V friendly dealer the Service Technician pointed out that my wheels were the "wrong size". I said yes I know, they're 255/45 vs. 245/45. He said, you know that puts more stress on the rear differential. I was speechless. :nono:
 

·
Registered
CTS-V
Joined
·
1,621 Posts
I think as long as the diameter size is equal to what stock is, going +1 or +2 on wheel size shouldn't matter. However, having more grip in the back because we want to either stagger the wheels or just want a wider tread in back, that should put stress on the differential.

Now I'm wondering if I should go staggered..... :(
 

·
Registered
Joined
·
169 Posts
Discussion Starter #14
I'm gonna call some places tomorrow and inquire about a custom diff. The '06 diff is going to take weeks to come in, and that is my only car. I'm just gonna get the '05 put back in and take the car somewhere and get THE RIGHT diff to fit in there....
 

·
Registered
Joined
·
86 Posts
And you are just gonna pay out of pocket for a new differential? Wow!

I'd jam 'em with the warranty and raise hell. If it means a new diff in a month or two, so be it!

But I guess the Maggie will negate the warranty anyway, right? What's your plan with warranty work once the blower goes in? Do you just pay for all repairs yourself? What wouldn't the Maggie impact, warranty-wise? Brakes, yes. Diff, yes. Motor, yes. Clutch, yes, transmission, yes...

Given that there isn't a CTS-V that's out of warranty yet based on age, do you all just ignore the warranty and mod at your own expense, paying out-of-pocket for all subsequent repairs? Sounds pricey :(

Skeeter
 

·
Registered
CTS-V
Joined
·
1,621 Posts
blackonblack,
Sounds like you are financially set, seeing how you are going to possibly take on the cost of getting a custom differential installed. If you decide to sell the wheels, PM me. I'll take them off your hands. After seeing you car, I'm sold on buying a set of Asanti's. ;)
 

·
Banned
Joined
·
340 Posts
blackonblackonblack said:
I'm gonna call some places tomorrow and inquire about a custom diff. The '06 diff is going to take weeks to come in, and that is my only car. I'm just gonna get the '05 put back in and take the car somewhere and get THE RIGHT diff to fit in there....
4 of the "new" differentials are located at GM's parts facility in Reno. I don't think it would be a problem getting one.

If you need a recommendation on a Cadillac dealer to use let me know. I have been through most of the Caddy dealers in OC and know which ones not to take your car to. Most are extremely unfriendly to modifications. Where are you located?

*************
 

·
Registered
Lemon Law'd '05 V
Joined
·
1,241 Posts
Please, everyone take a breather...wider tires or wheels should not make a significant enough difference on the diff to cause failure. As long as the rear tires are the same size, no real issues should arise. We all know the diff is a time-bomb and upping the wheels is not going to make anything worse. If anything, just say that the larger diameter tires allow the diff to actually work less, as less rpm is needed for the same speeds.

CVP, man...I'm so sorry. You just can't catch a break, huh? These guys just love to point fingers at everyone but "those who sign their checks". There must be some special training class that GM sends the "short-bus" techs to that teaches them to reply with customer-blaming phrases. When they finally graduate that school, they assign them directly to our local Cadillac dealerships...where we get to benefit from their "expert" training.

-ace
 

·
Registered
Joined
·
2,874 Posts
CVP33 said:
My last trip to my NEW and IMPROVED V friendly dealer the Service Technician pointed out that my wheels were the "wrong size". I said yes I know, they're 255/45 vs. 245/45. He said, you know that puts more stress on the rear differential. I was speechless. :nono:
Yep and if you put 215-70R 15s on the back you will have no stress and win every burn out contest on the planet. What a dingle, these guys grow on trees!
 
1 - 20 of 22 Posts
Top