C5 Diff help
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,890
Likes: 981
From: Whitby Ont.
C5 Diff help
Will try and keep this brief.. so my C5 Z pinion is pooched, broken teeth, is an RPM diff and transmission.. trying to locate ring and pinion locally, find one freshly rebuilt with 3.73, no big deal i have 3.90, doesn t matter much to me. so shop goes to jam the transmission in and find out the spline is different size, the rebuilt has smaller spline than trans. rebuilder is a track guy with cars and does lots of work on others, tells me c5 and c5z have different sizes, rpm tells me they are all the same. so i need the 30 spline diff, rpm tells me no one makes it, they will sell me a stock one and have it machined for $350 + $400 for gear set, NO thanks. Have read that could be a C6 internals in the case, not sure can t find anything on the spline count on C6 or C6z.. and am understanding that the C6 z is 9" opposed to C5 8.5". I am at a total loss as what i can do, maybe try and source a stock c5z diff and trans, no idea. rpm tells me the 30 was an upgrade from stock,if it is an upgrade, someone one must produce them without sending them out to be machined.
any input would help..
any input would help..
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
C6 Z06 is 30 spline. C5 Z06 is 27 as are the coupe and FRC MN6. I direct swapped an '02 Z06 diff into my '99 coupe. Base and vert C6 is 27 spline, GS and ZR1 are 30 spline.
You bought yourself a C6 Z06 diff.
Right churn wrong pew.
You bought yourself a C6 Z06 diff.
Right churn wrong pew.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,890
Likes: 981
From: Whitby Ont.
from what i understand no one makes a 30 spline for the c5z. the c6z is 8.75 and c5z 8.25 so i am guessing it won t fit in the c5 housing
Pro
Joined: Dec 2015
Posts: 660
Likes: 181
From: Knoxville TN
It’s very simple, you have an rpm trans/diff that has been upgraded to a 30 spline shaft, both the c5 and c5z have a 27 spline shaft, so you can either have rpm mod the new diff to accept 30 spline or replace the transmission with a stock 27 spline
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,890
Likes: 981
From: Whitby Ont.
yea that is simple.. 400 + 350 for a crown and pinion.. ridiculous
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Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
I glazed over the fact that your trans spline count was bigger than the diff. I had the opposite scenario in my head. Multitasking and poorly I might add.
493ls is spot on and it is that simple. To your point though that cost is a bit steap. But it is what it is. You don't want to go backwards on the trans upgrade. If it were me I'd just cough up the $750 and move on.
493ls is spot on and it is that simple. To your point though that cost is a bit steap. But it is what it is. You don't want to go backwards on the trans upgrade. If it were me I'd just cough up the $750 and move on.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,890
Likes: 981
From: Whitby Ont.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,890
Likes: 981
From: Whitby Ont.
I glazed over the fact that your trans spline count was bigger than the diff. I had the opposite scenario in my head. Multitasking and poorly I might add.
493ls is spot on and it is that simple. To your point though that cost is a bit steap. But it is what it is. You don't want to go backwards on the trans upgrade. If it were me I'd just cough up the $750 and move on.
493ls is spot on and it is that simple. To your point though that cost is a bit steap. But it is what it is. You don't want to go backwards on the trans upgrade. If it were me I'd just cough up the $750 and move on.
if it is 8.25 not sure if i can just stuff the c6z ring and pinion in my carrier and housing..
not matter what i do.. i have to add on another %42 to the price of anything.. thats what hurts.
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
yea.. i don t see many options.. C6z is 30 spline, and Summit told me is 8.25 ring gear, i m sure I found it was 8.75.
if it is 8.25 not sure if i can just stuff the c6z ring and pinion in my carrier and housing..
not matter what i do.. i have to add on another %42 to the price of anything.. thats what hurts.
if it is 8.25 not sure if i can just stuff the c6z ring and pinion in my carrier and housing..
not matter what i do.. i have to add on another %42 to the price of anything.. thats what hurts.
https://www.corvetteforum.com/forums...-z06-guts.html
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,890
Likes: 981
From: Whitby Ont.
Hey Walleye, this should help you solve that mystery.
https://www.corvetteforum.com/forums...-z06-guts.html
https://www.corvetteforum.com/forums...-z06-guts.html
and
he said he would send a free tube of ky jelly for me
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
