Rear diff Spider Gear broken
Thread Starter
Racer
Joined: Feb 2015
Posts: 458
Likes: 20
Rear diff Spider Gear broken
Apparently, I sheared the spider gear in my rear diff. I have a base M7 C7 making 620/775whp.
I did this on a 30mph roll at the track. They had a portion of the day where we were doing roll races.
How much power are you guys putting down on the stock diff? I know that RPM trans will soon offer an upgraded one, but it's costly. I'm rebuilding the stock one. No more digs for me for now.
I did this on a 30mph roll at the track. They had a portion of the day where we were doing roll races.
How much power are you guys putting down on the stock diff? I know that RPM trans will soon offer an upgraded one, but it's costly. I'm rebuilding the stock one. No more digs for me for now.
Last edited by ilivas; Jan 10, 2017 at 04:00 AM.
Drifting
Joined: Oct 2013
Posts: 1,746
Likes: 1,300
From: Fort McMurray Alberta
2018 C7 of Year Finalist
Seems to me they aren't holding up too well after ~740whp. That's next up on my list to replace as I'm sure mines going to bust before too long. I think I read a lot of people are upgrading to the C6Z diff? Unless I'm mistaken.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
I will wait until RPM comes out with a set up for putting the 4 small gears in the case with a 3:42 gear set up. With the weak 2 only set up will stock set up just not hold power to these Level. Robert
Thread Starter
Racer
Joined: Feb 2015
Posts: 458
Likes: 20
I don't do dig racing either, I was doing a roll. I was running MT ET street drag radials though with only 20psi tire pressure. It didn't spin at all.
Thread Starter
Racer
Joined: Feb 2015
Posts: 458
Likes: 20
Originally Posted by blue_bomber697
Seems to me they aren't holding up too well after ~740whp. That's next up on my list to replace as I'm sure mines going to bust before too long. I think I read a lot of people are upgrading to the C6Z diff? Unless I'm mistaken.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
Advanced
Joined: Apr 2015
Posts: 97
Likes: 10
From: Anaheim Ca
is it for for sale yet ?
Did RPM ever get the upgraded differential carriers ?
Also, I am under the impression they will only be for the standard differential, not the ELSD. And from what I have seen there would need to be two models available, as the 3.42 ring and pinion are a different dimension than the 2.41/2.73, requiring something like a spacer or 2 different part numbers. Ed
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Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
Did RPM ever get the upgraded differential carriers ?
Also, I am under the impression they will only be for the standard differential, not the ELSD. And from what I have seen there would need to be two models available, as the 3.42 ring and pinion are a different dimension than the 2.41/2.73, requiring something like a spacer or 2 different part numbers. Ed
Also, I am under the impression they will only be for the standard differential, not the ELSD. And from what I have seen there would need to be two models available, as the 3.42 ring and pinion are a different dimension than the 2.41/2.73, requiring something like a spacer or 2 different part numbers. Ed
Last edited by robert miller; May 26, 2017 at 09:50 PM.
Advanced
Joined: Apr 2015
Posts: 97
Likes: 10
From: Anaheim Ca
your experiences may support...
........ my belief that the constant power being diverted from one wheel to the other while traction control is in use during very "spirited" driving (the ElSD applies power and takes it away and the brakes get applied to the wheels individually) could be what weakened the spider gears and ultimately caused their failure.
Former Vendor
Joined: Dec 2005
Posts: 418
Likes: 5
From: Anderson Indiana
We do have a replacement for the spider gears, but it does require eliminating the ELSD portion of the differential. We haven't eliminated that on any cars in the shop yet. I know HPTuners has opened up some parameters, so this should be able to be tuned out. If you are interested, you can call either Shane or Jeremy at the shop to get more information.