fl dodge

had it to the dealer for this twice they replaced the torque converter the first time and the driveshaft assembly a one piece the last time but there is still a vibration only when locked up up till that point it runs smooth.its funny when you take off everything feels perfect until it locks up then you get the vibration if you take your foot off the throttle its smooths out when you apply a little throttle you can feel the vibration in the floor and seat. anyone have any ideas where to look.thanks in advance.

Sur5er

When they replaced the TC did they measure the radial and axial play of the xmsn input shaft? If the TC is locked to the input shaft and the shaft is not centered in the TC at time of lock up that might account for your vibration. Before lock up, there may be enough slop in the TC to accomodate the input shaft wobble without a noticible vibration. Just a SWAG, but if the dealer is eating the cost for not fixing it the first couple of times.................. You may just get a new tranny

KKB

I had the same type of problem years ago. It ended up being a u-joint.

fl dodge

at the dealership we did a cylinder performance test no. 6 showed around 84% the tech. said it could make a vibration you would only feel at lock-up coming back from the motor though the drive line . he swapped no.4 and no.6 as the dodge tech. had suggested he was involved in this thing also we went for a drive and no more vibration we also checked compression at the same time as the injector swap each one showed 425psi right in spec. can any-one explain this one?? no. 6 injector was just replaced by the dealer just before the vibration started.