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Originally posted by muscle96ss:
For all those that have been following my Auburn nightmare saga, it is almost over. Everyone I believe is finally on the same page. According to the GM rep and the dealership, there is no documentation anywhere in the GM manuals that explains the modifications that need to be done to the housing when putting the Auburn on(I have no idea why they were replacing the housing anyways). This led to improper oil flow and the shearing of the pinion. In any event, the proper housing modifications have been made and the repair is done and should be done correctly at this point.

There is still one potential problem though. A few months ago, I put the GMMG exhaust on and mated it with the CME tips and put a QTEC electric cutout on.

The dealership is claiming that there is a thermal issue that could diminish the life of the new unit. They used infrared to measure the temperatures at the pinion and axle and apparently the exhaust is too close to the axle and is heating it up to 265 degrees during use and the cutout is supposedly heating the pinion seal to 325 degrees as well. They measured the temperatures on the other side of the axle where the exhaust isn't, and it was 60 degrees cooler.

They are suggesting that I wrap the exhaust, redirect the cutout, and to something to get more airflow around the pinion.

When it comes to the technical end of stuff like this, I am clueless. However, I have been told that high temperatures such as these can be possible during the initial break-in period.

Anybody have any opinions or comments?

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The 265 doesn't sound that bad, the 325 is high. Most trans. and diffs. run well above 200 in normal operation. In fact you want the temps. at lease 212 to burn off any moisture.
Only problem I see with all this is that there are a lot of people with after market exhaust and they're not frying their rears.
 

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Posted by Steven2000SS (Member # 780) on :
 
Well you could either:

A. wrap the pipe with termal material
B. make a heat shield and have it thermal coated
C. have the entire exhaust ceramic coated
D. ignore the dealer and know they might try and screw ya on the warranty..

I had my share of dealership nightmares when it came to work on the differential..

Best of luck

p.s. that temp dosent sound all that high to me either
 

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Posted by chrisL (Member # 97) on :
 

quote:

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Originally posted by muscle96ss:
According to the GM rep and the dealership, there is no documentation anywhere in the GM manuals that explains the modifications that need to be done to the housing when putting the Auburn on(I have no idea why they were replacing the housing anyways). This led to improper oil flow and the shearing of the pinion. In any event, the proper housing modifications have been made and the repair is done and should be done correctly at this point.

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That sounds like the first thing they actually got right.

There is no GM documentation because the Auburn is SLP's. None of the SLP second sticker content is docuemented by GM.

I believe somewhere along the line a TSB was issued to remind dealerships about SLP second sticker content.

anywho.... glad to see youre back on track.


 

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Posted by Mike2001SS (Member # 2088) on :
 
Funny thing to me as many cars out there running GMMG chambered exaust like the Earnhardts and the Bergers and the Tom Henry's and all the people that bought them there is no exrtra heat problems
 

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Posted by KurtK (Member # 1779) on :
 
Glad to hear you are getting a resolution to your problem.

I would second the heat wrap/shield sugeestion.

Good luck!
 

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Posted by muscle96ss (Member # 2203) on :
 
OOOPS! I am reading my invoice from the Chevy dealership and it states that after 50 miles of highway driving that the left side axle tube is 135 degrees, righ side axle tube 170 degrees, left hand carrier bearing 175 degrees, right side carrier bearing 185 degrees, rear pinion bearing 190 degrees, and the front pinion bearing 210 degrees. It then states that the exhaust pipe at the rear axle location is 360 degrees and that it is heating up the axle on the right side where it passes.

These numbers are different than the numbers I they originally told me over the phone and I am assuming that since they are trying to get out of covering the Auburn for any future warranty work, that they would have put the other numbers on the invoice if in fact they were true.

Aren't these numbers somewhat normal?
 

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Posted by Bill Mason (Member # 1807) on :
 
I am assuming you are talking about where the exhaust runs over the axle on the right side. That is the stock location for all 4th gen Camaro/Firebirds.

The exhaust should run over top of the body brace for the panhard bar. That space is very very tight, as I found out when I had an SLP exhaust installed. The bottom of the 3 in tube over the brace needed to be flattened a little and the brace moved down (bent)even so slightly to get enough clearance so that the tube did not rattle and bang.
 

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