Bolt length
Thread Starter
Pro
Joined: Mar 2007
Posts: 727
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From: Austin TX area
Bolt length
In the process of attaching the rear cross member to the diff. I've misplaced the 4 bolts. Does anyone the length of the bolts?
Question 2, I have the 4 bolts and 3 lock washers to attach the cross member to the diff. I was very specific that there are only 3 washers. I wrote on the bag only 3 washers. However, nowhere in the AIM or the service manual does it say there should only be 3 washers. Because I was so careful about writing it on the bag, I want to be sure there should be 3 or 4. I am leaning toward 4, because I didn't write down which hole is the bolt only hole. Does anyone know for sure how many lock washers there should be? The AIM does should there should be lock washers.
Thanks Bill
Question 2, I have the 4 bolts and 3 lock washers to attach the cross member to the diff. I was very specific that there are only 3 washers. I wrote on the bag only 3 washers. However, nowhere in the AIM or the service manual does it say there should only be 3 washers. Because I was so careful about writing it on the bag, I want to be sure there should be 3 or 4. I am leaning toward 4, because I didn't write down which hole is the bolt only hole. Does anyone know for sure how many lock washers there should be? The AIM does should there should be lock washers.
Thanks Bill
Last edited by kingkohlmn; Oct 31, 2019 at 07:15 PM. Reason: Additional question
Just another Corvette guy
Joined: Feb 1999
Posts: 8,518
Likes: 3,865
From: Palm Springs, CA.
Hey Bill,
AIM manual shows them as GM part number 454932, which is just a 7/16" 14 (coarse thread) X 1" long bolt. These were probably Grade 5 bolts originally but if you're going to pick up 4 new ones, for just a bit more, you can buy Grade 8 blots.
Good Luck,
Greg
AIM manual shows them as GM part number 454932, which is just a 7/16" 14 (coarse thread) X 1" long bolt. These were probably Grade 5 bolts originally but if you're going to pick up 4 new ones, for just a bit more, you can buy Grade 8 blots.
Good Luck,
Greg
Melting Slicks
Joined: Dec 2000
Posts: 3,363
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From: Lansdale 19446 PA
2024 C3 of the Year Finalist- Unmodified
St. Jude Donor '10-'11, '15, '19
I saw these at Paragon -> https://www.paragoncorvette.com/p-35...-bolt-kit.aspx
I have the 4 bolts from my 78 but they are 1 ¼" long - not stock bolts. Have to be careful on the front 2 bolts not being too long.
I have the 4 bolts from my 78 but they are 1 ¼" long - not stock bolts. Have to be careful on the front 2 bolts not being too long.
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
standard bolts come in half inch increments. off the shelf 1-1/2 inch length, you put bolt in and count turns until it bottoms out. with no diff there. then measure what is sticking out. then measure thickness of diff where it clamps. then set it up with enough washers-shims or cut bolt shorter or both so that it pulls tight with 1 turn left under end of bolt.
Last edited by derekderek; Oct 29, 2019 at 06:18 PM.
2026 Loser of the Year
Joined: Sep 2013
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From: New Or-leens Loo-z-anna
FWIW...……..when getting around to installing spring pack shouldn't some weight of the car be on the spring pack to prevent cracking/breaking off the "ears/bolt holes" on the differential when the spring pack is torqued down?
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