Front Differential Mount Question
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
Front Differential Mount Question
1974 Coupe, 4 speed
While attending to the parking brake cables I observed the front differential bushings to be worn and in need of replacing. In reference to the rear of the mount shown in the diagram, the bolts are secured with castle nuts and cotter pinned. Is the mount designed to have movement at the rear of the bracket? My bolts are tight but the mount has movement. My perception is that this is a pivot point for the mount to allow the front snubber to act?
Thanks,
Eddy
Last edited by 74_stingray; Sep 4, 2018 at 09:11 AM.
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
Race Director
Joined: Jul 2004
Posts: 12,706
Likes: 329
From: Scottsdale Arizona
Are you referring to the snubber bracket on differential with the two pinned bolts going through? If so, there should not be movement between the bracket and diff. There should be flex between the bracket and the frame at the bushing.
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
Yes, there is significant movement of the bracket at the bolt holes. Should I just remove the nuts and re torque the bolts after installing new bushings?
Last edited by 74_stingray; Sep 13, 2018 at 09:01 AM.
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
It could have been left loose by Bubba? I have already found evidence of him in the parking brakes
Last edited by 74_stingray; Sep 4, 2018 at 01:36 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
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
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
Due to this bracket being loose. I would CLOSELY look at it and make sure the holes where the bolts pass through it have not be enlarged due to wear. Or the bolts themselves are worn.
As stated,,,this bracket should NOT move.
DUB
As stated,,,this bracket should NOT move.
DUB
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
Thanks for you reply.
Eddy
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
Follow up to differential front mount issues.
I received the new bracket and bolt kit in addition to the previously ordered front bushing. The failure in reference to the bracket is certainly due to the bolts not being properly tightened and torqued wherein the bracket was allowed to flex and move around. Though the nuts were cotter pinned they were barely tight, almost no effort at all to loosen. I have now replaced the bracket, bushings and all new bolts properly torqued per AIM and factory service manual specs. The bolts show significant wear and polishing due to the movement, bracket holes are also oversized.
I was able to replace all parts with the car on jack stands no problem. Even for an old dude! Thanks to all for the help.
I received the new bracket and bolt kit in addition to the previously ordered front bushing. The failure in reference to the bracket is certainly due to the bolts not being properly tightened and torqued wherein the bracket was allowed to flex and move around. Though the nuts were cotter pinned they were barely tight, almost no effort at all to loosen. I have now replaced the bracket, bushings and all new bolts properly torqued per AIM and factory service manual specs. The bolts show significant wear and polishing due to the movement, bracket holes are also oversized.
I was able to replace all parts with the car on jack stands no problem. Even for an old dude! Thanks to all for the help.
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
Glad to read that you took the time to inspect parts and get what you needed and installed for a proper repair.
A 'stupid' repair like this could have been totally avoided of the previous person TOOK THE TIME to do it correctly when the bracket and bolts were removed. So many people are in a hurry to 'just get it done' and do not do any homework on those things they actually do not know about.
DUB
A 'stupid' repair like this could have been totally avoided of the previous person TOOK THE TIME to do it correctly when the bracket and bolts were removed. So many people are in a hurry to 'just get it done' and do not do any homework on those things they actually do not know about.
DUB
Thread Starter
Burning Brakes
Joined: Jul 2018
Posts: 875
Likes: 289
From: LaFayette Georgia
C3 of Year Finalist (performance mods) 2019
St. Jude Donor '19
Glad to read that you took the time to inspect parts and get what you needed and installed for a proper repair.
A 'stupid' repair like this could have been totally avoided of the previous person TOOK THE TIME to do it correctly when the bracket and bolts were removed. So many people are in a hurry to 'just get it done' and do not do any homework on those things they actually do not know about.
DUB
A 'stupid' repair like this could have been totally avoided of the previous person TOOK THE TIME to do it correctly when the bracket and bolts were removed. So many people are in a hurry to 'just get it done' and do not do any homework on those things they actually do not know about.
DUB
Thanks for your help.
Eddy