inovermyhead
Well-Known Member
So having just had the propshaft ( driveshaft ) out and rebalanced plus the diff end coupling replaced, plus both drive shafts ( not sure in US speak but from the diff to the hubs ) completely rebuilt with new cans, cages and ball bearings the car no longer has a steady vibration, hurrah.
But on spirited acceleration in first gear at 4000 revs there is a thump thump sound that appears to be coming from the back of the car and it's loud....
The diff mount is new
The subframe that the diff mounts to has been reinforced with 3 mm steel plate
The engine mounts are new (BMW or Oem) athough on hard braking you can hear the fan hit the radiator, ting ting ting
The centre mount for the prop was preloaded and is the right way round, the doughnut is all good and time was taken to ensure the prop is lined up as perfectly as possible
I was hopeful that this latest work would resolve this thumping issue, but it appears not.
Am I missing something or has anyone else got any ideas.
Cheers. John
But on spirited acceleration in first gear at 4000 revs there is a thump thump sound that appears to be coming from the back of the car and it's loud....
The diff mount is new
The subframe that the diff mounts to has been reinforced with 3 mm steel plate
The engine mounts are new (BMW or Oem) athough on hard braking you can hear the fan hit the radiator, ting ting ting
The centre mount for the prop was preloaded and is the right way round, the doughnut is all good and time was taken to ensure the prop is lined up as perfectly as possible
I was hopeful that this latest work would resolve this thumping issue, but it appears not.
Am I missing something or has anyone else got any ideas.
Cheers. John