Shakes or Wobbles problem
1993 Isuzu Trooper 6 cyl Four Wheel Drive Manual 194000 miles
Our 93 Trooper, 5 speed 4wd vibrates between 50-60mph. Here's the list of items we have addressed so far: drive shaft balanced, u-joints replaced, transmission mount replaced, front wheel bearings replaced, front and rear brake rotors replaced, upper and lower ball joints replaced, and I'm sure we missed a couple of things. We also have brand new tires, and we thought it was this. We had the car back four times to the tire shop to check the balancing, and the last time they replaced the two rear tires just to be safe. We also had it aligned, and then checked again to be sure. We are at a loss.
We were told it might be inner cv joints, although the boots appear to be in good shape (no leaking), and we have manual hubs that, when locked, don't change the vibration at all.
Also, that it could be the rear wheel bearings? Or perhaps a rear pinion/bearing?
We are just scratching our heads, and hoping someone else has already chased down this mystery vibration on their trooper?