91 automatic downshift clunk
Thread Starter
Intermediate
Joined: Nov 2013
Posts: 34
Likes: 1
From: kennesaw ga.
91 automatic downshift clunk
anyone had this problem? when coming to a stop and transmission shifts into first gear I get a clunk somewhere in the drivetrain. transmission shifts fine and there are no other symptoms.
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
my 91 has it "somewhat," I have to really listen to hear it, generally. I suspect it is worn half shaft or drive shaft U joints. looked at that, and didn't notice anything obvious. when the weather is 90 degrees, I may inspect it further.
Safety Car
Joined: Aug 2013
Posts: 4,429
Likes: 608
From: Minneapolis Mn
Clunk
Does it happen if you shift from neutral into 1st or reverse? If you accelerate and let off the gas pedal, does it happen? If it does, I'd look into u-joints and rear end first. Next I'd start looking into the various mounts and insure they're tight.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
downshift clunk - common issue with some 90 and early 91 automatics. there was a TSB issued sometime in 91 addressing the issue, and a dealer installed kit for the fix, but those days are long gone. anyway, here's a link to the TSB -
http://www.corvetteactioncenter.com/...k#.UvV5HGiYYiQ
http://www.corvetteactioncenter.com/...k#.UvV5HGiYYiQ
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
Yep...
I agree with Joe.
Internal. Its possible that a good performance tranny shop would have the springs and the know-how to get it straightened out.
To eliminate the u-joints, start up and shift between rev and any for gear. See if there is the same clunk/clang noise as the trans grabs the drive-line. If there IS, u-joints are in order. The more of a "clang" the more likely its time for a joint. Clunk is internal, clang is drive-line. Seriously..
I agree with Joe.
Internal. Its possible that a good performance tranny shop would have the springs and the know-how to get it straightened out.
To eliminate the u-joints, start up and shift between rev and any for gear. See if there is the same clunk/clang noise as the trans grabs the drive-line. If there IS, u-joints are in order. The more of a "clang" the more likely its time for a joint. Clunk is internal, clang is drive-line. Seriously..
