Rear end gears
Race Director
Joined: Jan 2000
Posts: 12,375
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From: Florida
Don't know, but after my experience with them on my C6 (4.11s), I would never buy that ratio again - they just wear way too fast, and especially at higher torque levels. Mine were shot-peened and cryo'd too. The pinion just becomes too small. Highest I would go to expect at least decent longevity (more than the 14K miles I got) would be 3.73.
Race Director
Joined: Dec 2006
Posts: 12,391
Likes: 2,910
From: Fort Worth, Texas
Don't know, but after my experience with them on my C6 (4.11s), I would never buy that ratio again - they just wear way too fast, and especially at higher torque levels. Mine were shot-peened and cryo'd too. The pinion just becomes too small. Highest I would go to expect at least decent longevity (more than the 14K miles I got) would be 3.73.
Thread Starter
Instructor
Joined: Jan 2011
Posts: 191
Likes: 2
Can you confirm that they were a different size than the stock gears? I know in the fbody <3.90 lasted longer due to size difference.
Race Director
Joined: Dec 2006
Posts: 12,391
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From: Fort Worth, Texas
I have only run 4.10s in mine, so I can't comment and the other 3.73 and 3.90s I've come in contact with were already assembled. The teeth on the 4.10s are slightly weaker because there are more of them if that is what you mean, but they have been a 1.3 60' in a C6 which the gears are the same in the C5. I would contact RPM or RKT56 for a definitive answer though.
Last edited by PRE-Z06; Nov 21, 2013 at 03:45 PM.
Former Vendor
Joined: Sep 2010
Posts: 682
Likes: 11
From: Anderson Indiana
We have a C7 differential here at the shop. We should be able to tear it down tomorrow and see if the gears are interchangable with the C5/C6 units. I would be willing to bank on them being different now that Tremec is making the differentials instead of Getrag.
Drifting
Joined: Jan 2005
Posts: 1,827
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From: Tucson Arizona
St. Jude Donor '08
We have a C7 differential here at the shop. We should be able to tear it down tomorrow and see if the gears are interchangable with the C5/C6 units. I would be willing to bank on them being different now that Tremec is making the differentials instead of Getrag.
Would be interested in your opinion of " the pinion just gets too small" and therefore becomes a durability problem with 4:10 gears. In other words do 4:10 gears have a shorter life span then higher gears assuming quality set-up, etc.?
Last edited by jim2092; Nov 26, 2013 at 03:34 PM.
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Race Director
Joined: Jan 2000
Posts: 12,375
Likes: 406
From: Florida
To be fair, the car puts down 480-490 to the wheels, and I have a heavy foot, shall we say. Lots of those miles were canyon carving and HPDE.
My purpose for posting this in the C7 section is that the LT1 is putting out very similar torque to what my modded motor was running, and there is another 50ftlb on tap as we have seen from just headers and a tune. That is LS7 territory and I don't think 4.10s will live long under those conditions. I was under the impression 3.73 was the highest ratio that does not require a smaller pinion, but I may be wrong there...
Last edited by TTRotary; Nov 22, 2013 at 02:07 PM.
Race Director
Joined: Jan 2000
Posts: 12,375
Likes: 406
From: Florida
Race Director
Joined: Dec 2006
Posts: 12,391
Likes: 2,910
From: Fort Worth, Texas
My set was from Unitrax, and they ran great until they didn't. They were quiet right up until the pinion finally wore out, so I'm confident they were correctly set-up. According to the shop that replaced them (RPM in Santa Clarita), once the pinion went through the hardened outer layer, it was game over.
To be fair, the car puts down 480-490 to the wheels, and I have a heavy foot, shall we say. Lots of those miles were canyon carving and HPDE.
My purpose for posting this in the C7 section is that the LT1 is putting out very similar torque to what my modded motor was running, and there is another 50ftlb on tap as we have seen from just headers and a tune. That is LS7 territory and I don't think 4.10s will live long under those conditions. I was under the impression 3.73 was the highest ratio that does not require a smaller pinion, but I may be wrong there...
To be fair, the car puts down 480-490 to the wheels, and I have a heavy foot, shall we say. Lots of those miles were canyon carving and HPDE.
My purpose for posting this in the C7 section is that the LT1 is putting out very similar torque to what my modded motor was running, and there is another 50ftlb on tap as we have seen from just headers and a tune. That is LS7 territory and I don't think 4.10s will live long under those conditions. I was under the impression 3.73 was the highest ratio that does not require a smaller pinion, but I may be wrong there...
