Rear gear chg 1972
Thread Starter
Instructor
Joined: Jul 2004
Posts: 210
Likes: 0
From: Missouri
Rear gear chg 1972
I have a 308 rear gear and want a 370 to pep the car up a bit. I called a few Chevy dealers and it seems they don't have anyone who wants to tackel the job.
I called a Olds dealer and he said he'd do it but the gears, shims and seals would cost over $600 from them. He told me a local auto parts dealer could get me everything I needed for about $400. He said if I got the parts he'd do it for $250.
That sounds pretty good to me but just wanted to check in here to see if you guys have any opinions on the gears as far as the best brand. Also is there anything else I may need? I'm also thinking about putting a new composit rear spring on at the time along with a new rear hsgn since mine has one of the ears broken off.
Thanks in advance.
I called a Olds dealer and he said he'd do it but the gears, shims and seals would cost over $600 from them. He told me a local auto parts dealer could get me everything I needed for about $400. He said if I got the parts he'd do it for $250.
That sounds pretty good to me but just wanted to check in here to see if you guys have any opinions on the gears as far as the best brand. Also is there anything else I may need? I'm also thinking about putting a new composit rear spring on at the time along with a new rear hsgn since mine has one of the ears broken off.
Thanks in advance.
Tech Contributor
Joined: Aug 1999
Posts: 15,187
Likes: 4,008
From: Connecticut, USA
Prices for rebuilding vette differentials vary from place to place and also what is done to them. Most vette shops charge about $500 to replace the bearings, seals, and standard posi rebuild. Add about $250-$300 for new gears,$80 for HD rear cover, $70 each for side yokes. You're up to about $900 not including the labor to remove and install.
Material cost for comparision when I rebuild a differential runs
$100 for kit,
$130 yokes
$60-80 HD cover
$80 posi clutches
$25 posi shim kit
$225 new gears- US made
$25 for additive and oil
$250 for labor isn't a bad deal providing he does the job right.
Gary
Material cost for comparision when I rebuild a differential runs
$100 for kit,
$130 yokes
$60-80 HD cover
$80 posi clutches
$25 posi shim kit
$225 new gears- US made
$25 for additive and oil
$250 for labor isn't a bad deal providing he does the job right.
Gary
Race Director
Joined: Jan 2000
Posts: 13,022
Likes: 2,264
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
Easiest way is to find a used 3.70 diff and just swap them out. That way you still keep your 3.08's to install later on if you want to.
Drop me a note if you're interested. I have a 3.70 diff I need to sell.
JIM
Drop me a note if you're interested. I have a 3.70 diff I need to sell.
JIM
