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I just got the call from my dealer that the rear end will be covered under warranty but it is on national backorder with no exact ETA available. Is anyone else currently in the same boat waiting for a replacement? Is there a way to get it expedited by contacting Cadillac?
 

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I have a 2012 Coupe out of warranty and ordered mine and received it in 7 weeks. The dealer told me they were no longer available so I just kept driving my car and figured I’d deal with it when it breaks. After reading all I could in this forum I went back to the dealer and told Dennis “please try harder” and sure enough he called me a few days after we ordered and said “you’re right, I think we’ll get one”. Then about 4 weeks in he called and read this to me “ There is raw stock in a processing center for part #20931063. There is no anticipated ship date to a shipping facility. Will provide more info when available” and that meant I was getting it sooner than later. 3 weeks later it arrived. Yes I have pictures but I don’t think I’m aloud to post pictures yet. BTW no core charge either so I got to keep my old one.
So this story gets even more interesting. You know how people have tried different oils and different viscosity’s? Well I decided I’ll try redline since that’s all I use on my 93 RX-7. I bought 75w-140 and sure enough no difference but because you could grab my axles and move them pretty easily I had a horrible oil leak. Well then I decided when it was time to top off my oil I’d try Redline’s “Friction Modifier” it comes in a 4 oz bottle, and 3 or 4 days later I realized the humming/noise was 95% gone. I even had my Service Manager/Close friend hop in the car that morning and he was amazed that an additive could make such a difference.
I’ve had the diff in for about a week and everything is sounding great and no leaks. I did dump the oil that was in it when I installed it and used the Redline 75w-140 with 1 bottle of friction modifier/break in additive. The dealer I bought from is MEDINA A͏U͏TO MALL in Medina, OH and Dennis in Cadillac parts was my savior. Tell him Ernie sent ya. Oh and once I can post pics I will and I’ll update you on what I find inside the old diff. Good luck everyone!!!
 

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My 13 vagon already had the diff replaced under warranty but it just recently started the whining. So, now out of warranty, I searched high and low for a replacement. I found one at a Chevy dealer in NorCal and it's currently at the shop that's going to do the replacement. I located and had one delivered in less than 4 days. If you search hard enough, you can find one. As of a week ago, 5 dealers in Texas (Sewell was one of them) had them. I'm just waiting on my diff cooler from weapon x (thx JB) to arrive before I install the new one. Good luck


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I think Sewell might always be the best bet as far as finding one in stock at a dealer goes. They are frequently on back order though. Frequently replaced thing that they didn't make serviceable and isn't used in any other car. Kind of a pain in the ass situation for us.
 

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they are produced in batches and not enough of them so you always seem to get a little lucky or have to wait a long ass time

it seems to be worse now that the cars are out of production
 

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Discussion Starter #6
My 13 vagon already had the diff replaced under warranty but it just recently started the whining. So, now out of warranty, I searched high and low for a replacement. I found one at a Chevy dealer in NorCal and it's currently at the shop that's going to do the replacement. I located and had one delivered in less than 4 days. If you search hard enough, you can find one. As of a week ago, 5 dealers in Texas (Sewell was one of them) had them. I'm just waiting on my diff cooler from weapon x (thx JB) to arrive before I install the new one. Good luck


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I'm in Chatsworth--decided to go to Symes in Cadillac, and they were nice about everything, just couldn't tell me when exactly it'll arrive. I also just ordered the weapon x diff cooler, in preparation after the new one is installed. Are you planning to mount the pump up front or somewhere near the diff?
 

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I'm in Chatsworth--decided to go to Symes in Cadillac, and they were nice about everything, just couldn't tell me when exactly it'll arrive. I also just ordered the weapon x diff cooler, in preparation after the new one is installed. Are you planning to mount the pump up front or somewhere near the diff?
I live in Northridge. I used to go the Symes as well when I had warranty. You should deal with Diana and Charles. They good peeps. I think I'm going to mount the diff pump above the rear axle somewhere. My car is so low, I can't have it hanging and spare tire well is filled with air suspension stuff. Curious, did you go to supercar Sunday yesterday?


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I live in Northridge. I used to go the Symes as well when I had warranty. You should deal with Diana and Charles. They good peeps. I think I'm going to mount the diff pump above the rear axle somewhere. My car is so low, I can't have it hanging and spare tire well is filled with air suspension stuff. Curious, did you go to supercar Sunday yesterday?


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No I did not but I plan to start going soon. My car is red with satin graphite wheels.
 

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Just a reminder to everyone who doesn't want to wait for a diff or is willing to wait for a diff but doesn't want the hassle of it failing again: Creative Steel makes a Ford 8.8 swap. Yes, it costs a lot more than OEM, but then it is infinitely rebuildable (cheaply), and won't whine. They are also going to make a stock drive shaft adapter at some point, which will bring the price down more.

https://creative-steel.com/shop/09-15-cts-v-8-8-rear-differential-swap/
 

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I live in Northridge. I used to go the Symes as well when I had warranty. You should deal with Diana and Charles. They good peeps. I think I'm going to mount the diff pump above the rear axle somewhere. My car is so low, I can't have it hanging and spare tire well is filled with air suspension stuff. Curious, did you go to supercar Sunday yesterday?


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Perfect clearances on lowered sedan...


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Yeah but I'm a bit lower



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You'll be fine man. It sits above the exhaust and suspension. You'd have to destroy the whole car before it hit the pump or cooler!


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No I did not but I plan to start going soon. My car is red with satin graphite wheels.
Did you get your diff yet, or is it still on backorder?
 

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Just a reminder to everyone who doesn't want to wait for a diff or is willing to wait for a diff but doesn't want the hassle of it failing again: Creative Steel makes a Ford 8.8 swap. Yes, it costs a lot more than OEM, but then it is infinitely rebuildable (cheaply), and won't whine. They are also going to make a stock drive shaft adapter at some point, which will bring the price down more.

https://creative-steel.com/shop/09-15-cts-v-8-8-rear-differential-swap/
Are they going to get the adapter done before the rear poly bushings? :D

I was also looking at the GForce unit that uses a ford 9". I'm still researching, but the GForce looks to be better well build vs the CS 8.8 section.

Thoughts on the differences between the two, beyond cost alone?
 

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Are they going to get the adapter done before the rear poly bushings? :D

I was also looking at the GForce unit that uses a ford 9". I'm still researching, but the GForce looks to be better well build vs the CS 8.8 section.

Thoughts on the differences between the two, beyond cost alone?
All I will say is, the V1 community didn't like the GForce diff very much because it doesn't fit the subframe without mods and just seemed like a hassle overall, whereas the 8.8 is tried and true with RJ's V1 running low 9s, and it hasn't broken. Axles maybe, but I think the diff has been fine. Then again, there is no axle on the market that hasn't broken from 1000whp that I know of. I'm also just a big Creative Steel fan in general due to their customer service and grassroots style.
 

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I ordered mine back in April. They told me that at my dealer (crest in frisco, TX) there were 5 customers waiting for them I was number 2 on the list. I get a call saying mine has made it to the distribution center finally in late July. Only to follow up a week later to find out my order had been cancelled. I’m 100% confident they bumped me so they could give the part to someone that was under warranty and driving around in one of their loaners. I went to the dealership and spoke to the GM. 10 days later I had my new differential and they sold it to me at cost price of $1620. I would recommend anyone waiting on one of these escalate it to the GM of the dealership if you want to get your part.
 

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4+ months isnt too bad I guess.

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Just bought a 2013 Coupe and brought it back to the dealer because the passenger side differential half shaft seal was leaking. Still within the 60 day 3,000 mile warranty. Not sure what they are going to do (replace seal or entire diff), so time will tell if I’m going to be waiting for a diff too.



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Just bought a 2013 Coupe and brought it back to the dealer because the passenger side differential half shaft seal was leaking. Still within the 60 day 3,000 mile warranty. Not sure what they are going to do (replace seal or entire diff), so time will tell if I’m going to be waiting for a diff too.



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Mine was doing the same thing.

More likely the seal is not bad - the carrier bushings are and there will be a ton of vertical slop in the axle shafts before they grenade.

If they say jts just a seal, ask to see the work before they put it together. If the axle flange in the diff is obviously loose when moving it up and down, that would not be an appropriate fix.

I discovered the same on mine. Although FWIW I drove the car for months and nothing bad has happened (yet).

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Discussion Starter #20
Did you get your diff yet, or is it still on backorder?
Just got the call today that it showed up last week. Going on Thursday to drop the car off. I have a weapon x diff cooler that I'll be installing once I get the car back.
 
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