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So just got the car back, new OE engine mounts, I think I put in UUC poly trans bushings, LUK clutch and Dinan lightweight flywheel and around 2100 - 2800 rpm the drive train vibrates. When I put in the clutch, it goes away. I have a feeling it’s the fact I put in new engine mounts and those UUC mounts.

I also added Jed unicorn nugget for the shifter busing and rear front subframe solid bushing.

Any thoughts on what’s causing? I feel low hanging fruit is the UUC trans mount.


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It has metal cups on them or it doesn't. What color are the mounts as well. The black ones should be firm but not harsh, the blues are race only (unless you like a 4000 pound vibrator. Not that there's anything wrong with that...)
 

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damn you changed a lot of variables at the same time that are not exactly easy to undo. I pray you find the cause soon!
 
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Is it on both accel and decel through that RPM range? My money is on the trans mounts.
 

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Did you change the drive shaft CSB? Did you/they mark the DS at both ends before pulling?
 

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Might want to check the guibo as well. It has arrows on it that are supposed to point towards the lobes on the driveshaft and trans output flange. It could cause vibrations if it is not installed correctly.
 
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