Hi, I own a '89 Supra n/t and the question I have is in regards to its rough shifting. When shifting into every gear, there is a "knocking" noise as if something is not working properly. If I shift very slowly and carefully, I can time it well enough so the "knocking" sound won't happen. This has not yet limited its driving ability, but something must be wrong. My automotive knowledge is rather limited, and I speculate the cause of the problem could be the transmission, clutch, or differential.

Can anyone shed some light on what may be going on here? Or, are there definitive ways to test the working ability of these three things so I can pinpoint the problem, or at least rule out possibilities?

Thanks in advance!

James

Check your engine and transmission mounts, as that is usually a good place to start. The other thing it usually would be is your universal joints on your driveshaft. Supra has a 2 piece driveshaft and a carrier bearing, so it might be that too, just gotta get under that car and start wiggling.

i agree with poodles. id pay close attention to the u joints and have the car off the ground. i usually put it on jack stands and try to simulate the problem with the car in the air.