with above. This is the one you need.
Large Clunk when upshifting
Thread Starter
Intermediate
Joined: Jun 2010
Posts: 35
Likes: 0
From: Las Cruces NM
Large Clunk when upshifting
1980 - 305 - Auto Trans
When my car upshifts without me accelerating much, it makes a loud clunk noise that comes from the rear of the car. I can visualize what is happening (rear-end mounts loose? or something) but I have no idea what is technically wrong (to start pricing the fix).
If I'm accelerating pretty quick, there is no clunk when shifting.
Also, is this serious?
When my car upshifts without me accelerating much, it makes a loud clunk noise that comes from the rear of the car. I can visualize what is happening (rear-end mounts loose? or something) but I have no idea what is technically wrong (to start pricing the fix).
If I'm accelerating pretty quick, there is no clunk when shifting.
Also, is this serious?
Thread Starter
Intermediate
Joined: Jun 2010
Posts: 35
Likes: 0
From: Las Cruces NM
http://www.ecklers.com/corvette-rear...1963-1982.html
This the bushing you're referring to? I'm no mechanic but I'm definitely learning as much as possible
This the bushing you're referring to? I'm no mechanic but I'm definitely learning as much as possible
Burning Brakes
Joined: Sep 2006
Posts: 1,071
Likes: 86
From: Rotonda FL
No, the bushing you are looking for is at the front end of the differential. This bushing will deteriorate and allow the differential to rotate up and down in use. This is the clunk you hear.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
if its the front of the differential bushing it will also clunk when putting it into reverse. use lock tight on this bolt when you replace the bushing, you would be surprised how many of them loosen up over time.
Le Mans Master
Joined: Aug 2006
Posts: 7,431
Likes: 1,561
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
I could be the differential bushing or or the bolt could be loose or a U joint or something else, take a look before you order any parts.
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Advanced
Joined: May 2009
Posts: 65
Likes: 0
From: La Pine Oregon
Clunk as Shifting takes place
Yes the front mounting set-up on nose of rearend , I found this to be
totalliy shot and MISSING the big rubber when I got my '74 four speed.
Installed new stuff out of Urethane rubber and It was like another car.
Be sure to check the two threw-bolts in that bracket also ? They
need to be heathy and tight on front of rear housing .
totalliy shot and MISSING the big rubber when I got my '74 four speed.
Installed new stuff out of Urethane rubber and It was like another car.
Be sure to check the two threw-bolts in that bracket also ? They
need to be heathy and tight on front of rear housing .
