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Old 02-20-2001, 04:05 PM   #1
bill harvey
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Post I changed my clutch and tranny and motor mounts now i have a drivetrain thud

it only happens when i lift off the throttle is this normal i figure its becaus e the rear diff mounts are soft but i am not sure?
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Old 02-20-2001, 05:12 PM   #2
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I would agree with the rear diff, but mine seem to "thunk" when I'm accelerating with a hard upshift.
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Old 02-20-2001, 05:27 PM   #3
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Old 02-22-2001, 06:06 AM   #4
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First make sure everything is tight underneath....if it still clunks then change the rear mounts. In fact the mounts should all be changed at the same time so that overstressing older ones won't happen.
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Old 02-22-2001, 11:42 AM   #5
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Your rear diff shouldn't be shifting around that much Bill, especially in an unload circumstance. If you were, say to, drop the clutch at 6000 rpms and were hearing a thud, then sure, you maybe moving that diff a bit... but such is not the case. I'd check on the driveshaft bolts first. If they're loose you won't hear them because of the gradual acceleration (read as: slipping of the clutch). However under unload it could be returning to a static point. I've love to hear the sound sometime... But it honestly does sound like something is loose.

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Old 03-03-2001, 02:57 PM   #6
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Something was loose alright. It seems that three of the tranny mount bolts were missing. My fault - I guess I'd assumed that since we didn't have any bolts left over, we'd used them all up... Luckily, I had spares in my toolbox. (No, I didn't leave them in the toolbox by mistake, as they are slightly different from the original bolts.)

On a related topic, it was finally warm and dry enough to install the STi tranny mount in my car today. The good news is that the ACT clutch shudder is virtually eliminated. The bad news is there's much more road and tranny noise in the cabin now.

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