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Re: my car starts to shake after about 35-45 mph
Rack and pinion is the steering wheel joint, so if the steering wheel shakes or handling has decreased, then i would say it is the rp. , also check the wear on the tires for uneven wear, it could be alignment, does the steering pull to one side? it could be motor mounts just find the bolts and check em wiht a torque wrench, also inspect mounting bushings as well. to check trans. give it alot of gas to get past 35-45 mph and the shaking should go away at higher speeds, if it doesnt then its the trans missing "third".
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Well, assuming they actually checked all the bushings, ball joints and tie rod ends that only leaves the bearings/races and rack-n-pinion to check. You also need to check your motor and transmission mounts and bushings as well as the u-joints on the drive shaft if this is rear wheel drive.
check if you got rack in pinion steering the mounting bolts for looseness .check tie rod end housing seats and the inner tie rod ball studs for wear.if all is good.your rack has worn pinion bushing and rack bushing.
Check your pinion angle. I bought my car from a guy who changed the tranny upwards of 6 times. i figured that the stock trannycouldn't handle the power but as i checked into it, my pinion angle was wrong. I changed my bushings and put new rear control arms on. Knock on wood its worked longer than any other tranng. Check to see if your leaking out of your tail-shaft on your tranny and if you are i believe that the rear bushing on your tranny is bad as well and that may cause vibration. Also i heard from a guy that the urethane bushings in the back (which I have as well) may cause a problem with your welds that hold the spot where the control arms mount up at. Check into a torque box. I've had no problems but I'm just warning you.
Though it is very possible for the transmission to cause the truck's shaking, you may want to consider other components of the drive train specifically the universal joints (u-joint). They are more prone to damage that exhibits the shaking effect. You may also want to check the U-joint straps (there would be several), mounting brackets, pinion
yoke and its support. Normally, everything should be very tight with nothing
that can be budge or moved when you yank at them.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.