4-pinion C7 diff write-up
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,276
Likes: 317
No, the 4 c7 spiders are optimal, because they have the correct tooth profile for the side gears. More of the tooth is in contact at any given time 
What I meant was that IF you are using c6 spiders, better to use 2 c6 pins and bush the carrier
John
What I meant was that IF you are using c6 spiders, better to use 2 c6 pins and bush the carrier
John
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,276
Likes: 317
As of last week, no availability on c7 spiders or c7zr1 (all 2019) spiders to even compare.
I do have a 2-series carrier for sale as well as a complete 2.41 elsd removed from my car when I did this build on a 2.73 that I’m using now.
I do have a 2-series carrier for sale as well as a complete 2.41 elsd removed from my car when I did this build on a 2.73 that I’m using now.
Pro
Joined: Oct 2016
Posts: 578
Likes: 241
From: Hutto Texas
I have a base model/auto/2.41 differential located locally for only $500, that i would like to use the spiders & cross-pin out of to do the 4-spider conversion on my 2016 c7z/a8.
At 750/760 RW, would it be advisable to change ratio to 2.73 or keep the 2.41, for 1/4 mile?
Thanks!
Pro
Joined: Oct 2016
Posts: 578
Likes: 241
From: Hutto Texas
Update:
I ended up going with the RPM wavetrac & DSS stub axles, & DSS CV axles. I kept my 2.41 ELSD differential.
After I sent my differential to RPM, they ran out of DSS stub axles... because the machine that makes the axles at DSS was broken... my luck.
I ended up waiting 11 weeks before we could finally get the DSS stubs, and RPM could complete my differential and return it. I'm now in the process of putting it back together and should be up and running this week.
It's been a long hot summer, so it's not much fun drag racing in 100 degree weather here anyway.
I ended up going with the RPM wavetrac & DSS stub axles, & DSS CV axles. I kept my 2.41 ELSD differential.
After I sent my differential to RPM, they ran out of DSS stub axles... because the machine that makes the axles at DSS was broken... my luck.
I ended up waiting 11 weeks before we could finally get the DSS stubs, and RPM could complete my differential and return it. I'm now in the process of putting it back together and should be up and running this week.
It's been a long hot summer, so it's not much fun drag racing in 100 degree weather here anyway.
Are all of the C7 spiders the same?
I have a base model/auto/2.41 differential located locally for only $500, that i would like to use the spiders & cross-pin out of to do the 4-spider conversion on my 2016 c7z/a8.
At 750/760 RW, would it be advisable to change ratio to 2.73 or keep the 2.41, for 1/4 mile?
Thanks!
I have a base model/auto/2.41 differential located locally for only $500, that i would like to use the spiders & cross-pin out of to do the 4-spider conversion on my 2016 c7z/a8.
At 750/760 RW, would it be advisable to change ratio to 2.73 or keep the 2.41, for 1/4 mile?
Thanks!
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1st Gear
Joined: Jun 2019
Posts: 1
Likes: 0
Update:
I ended up going with the RPM wavetrac & DSS stub axles, & DSS CV axles. I kept my 2.41 ELSD differential.
After I sent my differential to RPM, they ran out of DSS stub axles... because the machine that makes the axles at DSS was broken... my luck.
I ended up waiting 11 weeks before we could finally get the DSS stubs, and RPM could complete my differential and return it. I'm now in the process of putting it back together and should be up and running this week.
It's been a long hot summer, so it's not much fun drag racing in 100 degree weather here anyway.
I ended up going with the RPM wavetrac & DSS stub axles, & DSS CV axles. I kept my 2.41 ELSD differential.
After I sent my differential to RPM, they ran out of DSS stub axles... because the machine that makes the axles at DSS was broken... my luck.
I ended up waiting 11 weeks before we could finally get the DSS stubs, and RPM could complete my differential and return it. I'm now in the process of putting it back together and should be up and running this week.
It's been a long hot summer, so it's not much fun drag racing in 100 degree weather here anyway.
1st Gear
Joined: May 2024
Posts: 1
Likes: 0
From: Houston
7th Gear
Joined: Jan 2025
Posts: 7
Likes: 0
I cannot find C7 ZR1/ Z06 spider gears anywhere. The 2014 part number says discontinued. It is my understanding that GM redesigned the spider gears in 2019. Would anyone happen to have parts to complete this mod? Or who would I talk to in getting this done? Thank you
5th Gear
Joined: Feb 2024
Posts: 5
Likes: 0
Any luck finding spider gears or equivalent? I'm currently trying to source a used diff to build from it's side carrier spider gears. I would think there is another common gear on the market that would fit with minimal machining... These cars are not that old.