Hey Guys. I have been battling a vibration issue for a while now but had it almost beat and was only slightly noticeable around 70 MPH.
This was done by driveline angle changes, u joint replacement and finally swapped out my driveshaft.
I just recently had my 904 rebuilt and after I installed it, including the same torque converter, I am getting pretty nasty vibrations at around 55 MPH.
The vibration also happens while revving in neutral/park.
I have a 5.9 Magnum with the factory flex plate. Converter is a Factory 340 2400 stall with the weights removed for zero balance. Balance is done with the flex plate.
The only thing I can think of is that although I removed the large converter weights when I first built the engine (2 years ago), my build pictures show that I may have left the smaller thin weights around the circumference of the converter. When I installed the converter this time the orientation was different and located those weights in a different spot causing the balance to change. The Magnum does have an offset mounting hole that needed to be enlarged slightly for the converter to mount. Maybe all of my previous actions only minimized the vibrations. Dunno.
At this point the only thing I can think of is to remove the converter outer weights and try again. Do you think the small weights are possibly the cause of the imbalance?
My converter with heavy face weights removed.
Example of small outer weights
This was done by driveline angle changes, u joint replacement and finally swapped out my driveshaft.
I just recently had my 904 rebuilt and after I installed it, including the same torque converter, I am getting pretty nasty vibrations at around 55 MPH.
The vibration also happens while revving in neutral/park.
I have a 5.9 Magnum with the factory flex plate. Converter is a Factory 340 2400 stall with the weights removed for zero balance. Balance is done with the flex plate.
The only thing I can think of is that although I removed the large converter weights when I first built the engine (2 years ago), my build pictures show that I may have left the smaller thin weights around the circumference of the converter. When I installed the converter this time the orientation was different and located those weights in a different spot causing the balance to change. The Magnum does have an offset mounting hole that needed to be enlarged slightly for the converter to mount. Maybe all of my previous actions only minimized the vibrations. Dunno.
At this point the only thing I can think of is to remove the converter outer weights and try again. Do you think the small weights are possibly the cause of the imbalance?
My converter with heavy face weights removed.
Example of small outer weights
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