I would like to know more too. I have an A4 though.
C6 rear diff and suspension install
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
C6 rear diff and suspension install
Trying to find some information out before tackling this.
C6 production 08/04
Entire rear suspension with 3.42 diff
I know about the weak case issue
I know the transmission were the same for 05 and c5, so the diff will bolt directly to the transmission.
Biggest question is about the wheelbase added length of 1.2" for the 2005 year did it move the diff back as well?
So will i need a spacer to fit the diff to the transmission because of that? Rkt makes an adapter to fit 06-up that is 5/8" thick. But that is a bolt pattern change as well.
C6 production 08/04
Entire rear suspension with 3.42 diff
I know about the weak case issue
I know the transmission were the same for 05 and c5, so the diff will bolt directly to the transmission.
Biggest question is about the wheelbase added length of 1.2" for the 2005 year did it move the diff back as well?
So will i need a spacer to fit the diff to the transmission because of that? Rkt makes an adapter to fit 06-up that is 5/8" thick. But that is a bolt pattern change as well.
Last edited by mrr23; Feb 11, 2017 at 11:15 AM.
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
I'm not familiar with the 05 but I'm pretty sure all c6 diffs bolt up completely different than the c5 so you will need the c6 cradle and rkt56 conversion mounts... the rear wheels will be pushed back in the wheel wells a tad bit depending on what suspension setup you are using... you have a couple of choices, you can keep the c5 lcas if you are running coilovers or if you don't have coilovers and will be using a shock/leaf spring setup then you will have to use c6 lcas/leaf spring... from the cars that I have seen the ones with c6 lcas have the wheels pushed further back in the wells... also the c6 torque tube is longer as is the shift rod by about an inch or so, just reuse the c5 tube and shift rod... call Rick at rkt56 or any of the guys at rpm and I bet they will know for sure what you will need to do with 05 parts... check out this link, I recently posted some before and after comparisons of my car https://www.corvetteforum.com/forums...project-2.html
Last edited by StingrayRebel; Feb 11, 2017 at 09:24 PM.
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
I'm not familiar with the 05 but I'm pretty sure all c6 diffs bolt up completely different than the c5 so you will need the c6 cradle and rkt56 conversion mounts... the rear wheels will be pushed back in the wheel wells a tad bit depending on what suspension setup you are using... you have a couple of choices, you can keep the c5 lcas if you are running coilovers or if you don't have coilovers and will be using a shock/leaf spring setup then you will have to use c6 lcas/leaf spring... from the cars that I have seen the ones with c6 lcas have the wheels pushed further back in the wells... also the c6 torque tube is longer as is the shift rod by about an inch or so, just reuse the c5 tube and shift rod... call Rick at rkt56 or any of the guys at rpm and I bet they will know for sure what you will need to do with 05 parts... check out this link, I recently posted some before and after comparisons of my car https://www.corvetteforum.com/forums...project-2.html
I have an auto. all i am using the the differential and entire rear suspension.
Last edited by mrr23; Feb 12, 2017 at 07:09 AM.
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
People have cut and welded the stock mounts to offset them.
Are you sure you want to go that way. The '05 C6 guys are using C5 diffs and making an adapter plate for the C5 mount since the '05 C6 diffs are relatively rare and expensive used.
Are you sure you want to go that way. The '05 C6 guys are using C5 diffs and making an adapter plate for the C5 mount since the '05 C6 diffs are relatively rare and expensive used.
Last edited by lionelhutz; Feb 12, 2017 at 02:23 PM.
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
if going through the trouble it's a better idea to go with the 08+ c6z, zr1, or grand sport trans/diff in my opinion
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
Just read the torque tube is the same for c5 and 2005 c6. So I'm still wondering if it will just fit right in and it's the 2006-up that is pushed back.
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
yes.
found out lgmotorsports makes solid mount. so i'll be making some out of square tube steel and weld bolts to it. i can put a 1/4" rubber mat material i have to reduce vibration.
found out lgmotorsports makes solid mount. so i'll be making some out of square tube steel and weld bolts to it. i can put a 1/4" rubber mat material i have to reduce vibration.
Safety Car
Joined: Mar 2016
Posts: 3,534
Likes: 432
From: Atlantic Beach FL.
Are there any down-sides to having solid mounts? You can get liquid polyurethane resin on line and mold your own poly designed ones.
I have seen folks make their own engine mounts with it using the old hardware.
I have seen folks make their own engine mounts with it using the old hardware.
Last edited by Rob 02; Feb 13, 2017 at 11:59 PM.
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
Maybe some vibration. Some might say increased chance of breaking the case. But If LG Motorsports sells them, I don't think it'll be a problem. Can always add a rubber pad between the mount and case to reduce vibration.
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
I had to cut 3" out of the x-pipe and add that section to the over axle pipes in order for the exhaust to clear
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
As much researching I tried, never came across this information. My fault for not asking. Thanks for letting me know the length. It'll be fun getting it out and in again.
Last edited by mrr23; Feb 25, 2017 at 08:33 PM.