shake of death

1993 JEEP GRAND CHEROKEE
123,000 MILES • 6 CYL • 4WD • AUTOMATIC
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THEBALDONE
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I have a 93 jeep grand cherokee laredo. when driving i don't get a little shake. I get the shake of death. I start and the rpms go up and down, stay level if I push on the gas. When driving I can go about a mile and then it seems like it wants to stop and let off the gas and everything goes back to normal. If I am doing this 50+mph it feels like the engine or transmission is going to come through the floor boards. then keeps going. First time I thought it was going to blow up. Asked mechanic friend about it and doesn't know where to start.
Jun 3, 2011 at 2:44 AM
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CARADIODOC
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Take it to a tire and alignment shop for an inspection. They will look at the ball joints, tie rod ends, track bar, and control arm bushings. There will also be a steering stabilizer that is the likely suspect. It looks like a regular shock absorber but it pulls apart and pushes together equally hard either way. One end attaches to the cross member and one end to the steering linkage. It's purpose is especially important on Jeeps because they call for a REALLY high caster setting, (11 degrees compared to around 3 degrees for most cars and trucks). Caster is what forces the steering wheel to self-return to center after you turn a corner. When caster is real high, the steering wheel comes back to center so fast, it overshoots and goes the other way, then it comes back again and goes too far again. Road forces from moving down the road keep that oscillation going until you slow down. The steering damper stops that. Typically the damping oil leaks out where the shaft comes out, then in effect, it isn't even there. Even if there's no sign of leakage, that damper is the most common suspect.
Jun 3, 2011 at 3:54 AM