Bushings
Thread Starter
Intermediate
Joined: Apr 2018
Posts: 36
Likes: 0
From: Lexington, NC
Bushings
After replacing all the rear bushing except for the two control arms, My transmission still clunks into gear (auto) and my idle is set at 700rpm. All the u-joints are good and no sign of drastic wear at the front of the differential. Could it be those control arm bushing will ease that a little
Thread Starter
Intermediate
Joined: Apr 2018
Posts: 36
Likes: 0
From: Lexington, NC
Don't thinks it's the transmission. More so in the rear end. The car wants to jump a bit. I do think it's best to have another look at it. Appreciate the quick response and I will check the tranny mount next weekend.
Racer
Joined: Apr 2008
Posts: 406
Likes: 46
From: Lebanon OH
I do not think the control arm bushings would fix the knock. I believe there is an exhaust mount bracket attached to the transmission mount at the front of the cross member. If there is a lot of movement at the transmission mount, maybe a bad exhaust mount further down the car is allowing some contact. I hate chasing down noises like that. Let us know what you find and good luck.
MajD
MajD
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
i would look at motor mounts to...maybe its time to look at the rear differential....i seem to recall there is a sequence for with the car turned off and the car jacked up turning the rear wheels to diagnose the differential components for wear. i will have to look for it.
Le Mans Master
Joined: Aug 2005
Posts: 6,529
Likes: 1,962
From: Temple Terrace Florida
A classic sign that your control arm bushings are shot is that the car feels as if it wants to steer from the back. When you let off or on the gas, the car will make a knocking sound and try to steer itself for a few feet. You can check to see if some shims fell out or if the bushings are bad by jacking up the car, remove the wheel and put a large screw driver or crowbar in the the cavity and pry the trailing arm from side to side. If there is movement, you have found your problem. If there is poly, I can safely say that you have found the problem. Jerry
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
wait a second guys......its the front differnial mount bushing that has disintegrated.....i had this happen to me....the front of differential is actually slamming into the bushing mount..
i probably would use rubber but here is what it looks like...you cant see the inside bushing
https://www.zip-corvette.com/63-82-front-differential-mount-cushions-restoration-poly.html
https://www.youtube.com/watch?v=9f9SxWLC0pM
i probably would use rubber but here is what it looks like...you cant see the inside bushing
https://www.zip-corvette.com/63-82-front-differential-mount-cushions-restoration-poly.html
https://www.youtube.com/watch?v=9f9SxWLC0pM
Last edited by bobs77vet; Jul 11, 2018 at 10:27 AM.
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