After I finished my T5 swap, I've had some vibration. It's RPM dependant, so it's gotta be from the trans forward. I thought it might have been because of my Energy urethane trans mount, so I pulled it out last night and put the stock rubber one back in. It's less noticable, but still there. So that tells me it's just as bad, I just don't feel as much of it because of the rubber mount.

While I did the t5 swap, I pulled the motor to replace the rear main seal, oil pan gasket & timing chain cover gasket. The motor seems to run fine and doesn't throw any codes.

The car has crisp throttle response and doesn't seem to exhibit any substantial vibration when I rev it in the garage, or at least none that I can recognize. It may have somewhat more vibration than before, but now that I'm looking for it, I may just be noticing things that were always there.

When I take it out, the vibration seems to come on at around 3,000 rpm, all the way to whatever RPM I choose to take it to. It doesn't seem to get significantly worse as the rpms increase though. Cruising along at 60mph in 5th gear I don't feel it.

I've checked that the plug wires were firmly connected at both ends, I checked my IAC and TPS, and I changed that trans mount. I had the flywheel resurfaced before installing the t5, and I've got a brand new Centerforce Dual Friction clutch, pressure plate, and self-adjusting throwout bearing. I checked for vacuum line leaks and couldn't find anything. After the car was off for 5 minutes I unplugged the vacuum canister and it still had plenty of vacuum.

Anybody have any ideas here? I'm afraid do drive the damned thing because I don't want to cause any damage.

 

When I pulled it out of the garage and parked it, I blipped the throttle a few times. The throttle response is amazingly quick. Every time I blipped it, it shot right to 3,000 like a lightning bolt. THe car NEVER had throttle response this fast when it was spinning the torque converter. This got me thinking. Is it possible that the motor has always had a roughness like this, but the automatic was just damping it enough that I didn't feel it? *** knows the auto killed my performance, so why not vibration too? Maybe with my motor (214/224 .442/.465 112lsa hydraulic cam, fuelie heads, 10:1 compression, headers, etc) just isn't as smooth as a stocker? or is there still something I'm missing?