Have you checked the carier bearing in the rear driveshaft? It is the rubber thing that supports the rear driveshaft half way between the transmission and the rear axle. Grab the shaft and try to push it up and pull it down. It should move a little, but not clunk into the crossmember that it passes through.TROOPY said::? Well the beast is a 89 Trooper with the problematic 2.6l motor. I had the motor replaced with a "new" 'remanufactured" longblock about a year ago and recently the head gasket went bad and I had that fixed last week.
Now the motor is strong again and I have driven it to work the past couple of days and I noticed a shudder! This shudder happens when I go up on an incline (hill) in 3,4 or 5th gear, this can happen at 3k rpm and up and at speeds from 30ish MPH to 60 MPH. I have been reading the posts about this problem but I dont think I have a LSD (REAR) in my model, Its a mnual 5speed. Last night I put Castrol Gear Oil in 80/90 made for LSD but it still presists today. The shudder will get worse with more acceleration applied but goes away when you let off of the gas or put the cluth in. Is there anything else that could cause this type of vibration? It seems like the engine is having a hard time transfrering power out of the rear wheels when it happens?? Any help with this kunundrum would be helpfull. I dont realy drive the truck that often but its great in the snow and for taking my 2 dogs to the park. Please help !!!!
:roll: Im in Baltimore Maryland. you can email me at [email protected] if you could help... thanks in advance and this board RULES when it comes to TROOPY...
It is right where the driveshaft passes through this crossmember:
Also check the u-bolts that hold the axle to the leaf springs, and the leaf spring bushings. Something could be loose and causing the axle to vibrate. On the same line, check the engine/transmission mounts. Could it be the clutch slipping?