Something is grabbing in rear only in reverse when cold
Something is grabbing in the rear, only in reverse when cold start. when i back out of my driveway most of the time when the car in cold start something is grabbing could it be brakes, rear end, u joints?
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Sounds like the rear pads are worn out, your front brakes are keeping the truck from rolling. You need to have the high rpm checked for that 30-50 seconds as it is called the "cold start routine" and is meant to rev the engine for that time period. There may be an adjustment to keep it from over revving, check the specs for the rpm.
Even if you fix the rear brakes, the stress on the U-joints and differential or transmission is needless and can be fixed by limiting the high rpm in the "cold start cycle".
It sounds like the brake shoes are reversed or the wrong ones. Also may be faulty, or incorrectly installed brake hardwre. I'm assuming this problem did not happen until after the brake job? If it did, then you might have a different problem.
You are probably correct in thinking its the wiper motor. You can do this but you will need to remove all the interior trim from the rear hatch first. Get a trim clip removal tool at a parts store...it will work much better than just a flat blade screwdriver. You'll have to remove the trim panels starting in order from the top of the door, then the left rear window side trim, then right rear window side trim, then the grab handle, and finally the main rear hatch trim panel. Once inside, removing and replacing the rear wiper motor is easy. You'll start by lifting the cover on the wiper arm retention nut. Remove this nut to get the wiper arm off, then remove the nut under neath which is the motor shaft mounting nut. Now, back inside to remove the other 3 motor mounting bolts. Don't forget to disconnect the connector for the motor wires. Reverse steps to replace.
reverse requires more hydraulic pressure to hold it in reverse. Maybe you have a partially plugged filter that the thicker, cold fluid can't get through. The whirr could be the pump in the trannie being dtarved for fluid due to being plugged. Otherwise, you may have a bad clutch or band for reverse that requires a trans overhaul. good lcuk.
Yes, it definitly sounds like a fluid problem. However, did you know that there are different weights of rear end lube for different rear ends? I would advice going to the dealership and asking what weight they show for your rear end. You need to first copy the tag # off the rear end so that they can be sure which one you have.