junglejuice
NAXJA Forum User
- Location
- Brisbane, Australia
Firstly I need to add that my Xj has the 4.0 litre I6 with the Aw4 auto which is stock for here in Australia, it is regeared to 3.73:1 running an Old Man Emu 2" lift kit with rear airbags.
This issue reared its ugly head when preparing for our recent trip to Tassie (3000kms each way) whereby it would vibrate at 100kmh~ I had recently added an extra leaf to my OME pack as well as fitted a secondhand set of wheels and tyres, stock sized 225/75/15's on alloys which I had balanced.
I fitted a 2.5* castor wedge (I am running a SYE) to the rear but all the way to Tassie and back it vibrated at anything over 99kmh and it is a long way.
I noticed on the first day that 3 of the 4 wheels lost their weights so once I got back I had them rebalanced and was told by the tyre mob that stock Jeep alloys require special weights which they now had so redid it for free.
No improvement...
So I removed the extra leaf, no improvement...
I had an issue with the transfer case which meant the removal of the SYE, no change.
Lowered the rear by removing the inverted leaf from my OME pack, down to 1.5", no change.
Tried a second stock tail shaft, no change.
Tried a set of stock steelies with good cond 235/75/15's all freshly balanced, no change.
Refitted my modified output shaft with the SYE to my replacement transfer case, no change.
Fitted some 6* caster wedges with the SYE sitting at 2.5", diff @ 78*, tailshaft @ 80*, no change.
Tried another front drive shaft in the rear with the SYE, no change.
What I noticed today is if I lift off the pedal all the vibes disappear, as soon as I ease back on the pedal they come back, I also tried dropping it back to 3rd to see if it might be the harmonic balancer which changed the revs from ~2k to ~3.5k, no change.
Has anybody got any suggestions as this is driving me insane?
Cheers, JJ
This issue reared its ugly head when preparing for our recent trip to Tassie (3000kms each way) whereby it would vibrate at 100kmh~ I had recently added an extra leaf to my OME pack as well as fitted a secondhand set of wheels and tyres, stock sized 225/75/15's on alloys which I had balanced.
I fitted a 2.5* castor wedge (I am running a SYE) to the rear but all the way to Tassie and back it vibrated at anything over 99kmh and it is a long way.
I noticed on the first day that 3 of the 4 wheels lost their weights so once I got back I had them rebalanced and was told by the tyre mob that stock Jeep alloys require special weights which they now had so redid it for free.
No improvement...
So I removed the extra leaf, no improvement...
I had an issue with the transfer case which meant the removal of the SYE, no change.
Lowered the rear by removing the inverted leaf from my OME pack, down to 1.5", no change.
Tried a second stock tail shaft, no change.
Tried a set of stock steelies with good cond 235/75/15's all freshly balanced, no change.
Refitted my modified output shaft with the SYE to my replacement transfer case, no change.
Fitted some 6* caster wedges with the SYE sitting at 2.5", diff @ 78*, tailshaft @ 80*, no change.
Tried another front drive shaft in the rear with the SYE, no change.
What I noticed today is if I lift off the pedal all the vibes disappear, as soon as I ease back on the pedal they come back, I also tried dropping it back to 3rd to see if it might be the harmonic balancer which changed the revs from ~2k to ~3.5k, no change.
Has anybody got any suggestions as this is driving me insane?
Cheers, JJ