Bwicked

iTrader: (17)

So heres the sympton guys:

When car goes past 45-50mph the whole car will begin to vibrate. The faster I go the faster the Vibration and more noticeable it gets until about 100mph then its to fast to really notice.

Car was put away for winter on jackstands. Wheels off. Issue is still there, so its not a balancing issue.

Car is Twin turbo JWT kit. Built motor
Southbend DXD clutch
6MT

After searching around I thought it was axles. Bought a set. Took of the passenger Rear axle and vibrating was still there. Removed Driveshaft and Vibration was gone. Re-attached driveshaft, and removed driver axle, Vibration is back but much less noticeable.

Some things to note about the car :
*The differential bushings in the subframe are shot and spilled out.
*About a month or two and 1000 miles prior to this, i replaced the clutch. No issues at all though during this time.
*Right wheel bearing seems to be shot shortly after this vibrating
*As car is in gear and moving past 50mph + I notice the driveshaft does not seem to be wobbling and the transmission has no vibrating...however the Differential seems to be vibrating quite a bit when i touch it. I dont notice it wobbling or moving though.
*Totally SPeed related. NOT rpm.
* you can touch the body of the car anywhere and feel the vibrating
* I purchased a differential from a member here about last year and one of sides ( you know how theres 6 bolts that connect the axle to the driveshaft? well one of the hole was slightly bent inwards, bolt can still go through and tighten.) however with the axles off this still vibrates. could that have caused something internally in the DIF to go bad?
--------------------
possible causes?
U joint on driveshaft?
Differential?
Bushings?
longshot but pilot bearing wasn't replaced during cluch install,
doubt its the clutch and that cant be mis-aligned really with the tool and during break in i had no issues.


ANY insight pls??!?

duro78

iTrader: (6)

It has to be tires,wheels or rotors. What do you mean it was on jack stands and the problem was still there? Car would have to be moving right

Bwicked

iTrader: (17)

Cars put away for winter on jackstands. So the Wheels and tires are off. It cant be the rotors or brakes because the vibrating still is there it seems when the axles are disc from the diff

nismo1234

is there anyway you could balance the drive shaft that seems to be the problem anyway could tell me wht you think of your turbo and how reliable it is thanks

ZSpeedPerformance

iTrader: (71)

Is it a wobble feel or more of a quick vibrating feel?
Wobble would be diff or axle related. A quicker Vib would be in the driveshaft.

I would start with replacing the diff bushings since you know they are bad.

Bwicked

iTrader: (17)

TUrbos are great. 2+ years strong.

Def feels like a quick vibrating rather then wobble

Ronin82

iTrader: (4)

Maybe your motor mounts need to be improved or re-enforced??!!

kramykram

iTrader: (135)

i would go with the differential bushings being shot. that sounds like a sure shot. that would of been the first thing i replaced over anything else. just get some spl solid bushings.

MTZ33

iTrader: (2)

Motor mounts maybe...?? Theres a ton of possibilities to diaagnose and its quite hard through a forum.. i say check all mounts..