Extreme engine vibration (especially while in reverse)

22catch22 · #1 (**permalink**) 10-06-09, 01:08 PM

Just finished putting a remanufactured engine in my stang. Everything runs great except this vibration. The vibration isn't too bad until the car is put into reverse. The minute I shift into drive or neutral, the vibration minimizes. I have no idea what it could be. The engine mounts
and the transmission mounts were replaced during the motor swap. I also put in a new vibration damper. I've rechecked all of the bolts numerous times. I took it to a transmission specialist to ensure that the torque converter wasn't loose. Any ideas??

Chythar · #2 (**permalink**) 10-06-09, 01:52 PM

Sounds like the engine isn't balance right to me. the 94-95 5.0's use a 50oz vibration dampener and a 50oz flywheel/flexplate. The old weight was 28oz. To mix those parts is a very bad thing.

22catch22 · #3 (**permalink**) 10-06-09, 08:21 PM

I was informed of this weight difference while doing the swap, so I made sure that the new engine was balanced at the same weight as the old engine. Thanks for the reply.

94 Black GT · #4 (**permalink**) 11-01-09, 09:16 PM

could it be a driveshaft problem? i had a strange vibration and come to find out the rear d/s bolts were loose..thank god i didnt catapult myself..just a thought

302GTS · #5 (**permalink**) 11-01-09, 11:02 PM

Quote:

Originally Posted by 94 Black GT

could it be a driveshaft problem? i had a strange vibration and come to find out the rear d/s bolts were loose..thank god i didnt catapult myself..just a thought

Had the same problem with my 95 - I didn't tighten the d/s bolts enough last time I had it out. Luckily I fixed the problem right after noticing the vibration.