Well i had this howling/roaring noise that i thought was comin from the front end. I replaced both side hubs and that noised seemed to be covering the noise from the rear end. The thing is, when i turn to the left the noise stops. Also i put the car up on a lift, and i can grab the rear of the driveshaft and it has slack in it where it goes into the rear end. Anyone have ne imput before i start tearing things apart?
Rear end problem
- Thread starter pea_jay
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wmburns
SN Certified Technician
Check pinion bearings & pre-load
Assuming that no recent work has been done on the rear end. The pinion bearing is wore out. The fact the pinion can be moved in/out says there is NO pre-load.
The excessive play in the pinion causes whine as it changes the mess with the ring gear. The pitch changes as the car switches between power and coast.
Assuming that no recent work has been done on the rear end. The pinion bearing is wore out. The fact the pinion can be moved in/out says there is NO pre-load.
The excessive play in the pinion causes whine as it changes the mess with the ring gear. The pitch changes as the car switches between power and coast.
wmburns
SN Certified Technician
You could try installing a new crush sleeve and reestablish the pinion pre-load. However, that assumes that the ppl who did the 3.73 install were less than capable mechanics.
If the bearing is worn out, you will not be able to establish correct pre-load. Possible that it will pre-load correctly but still make noise. Only way to know for certain is to inspect.
If the bearing is worn out, you will not be able to establish correct pre-load. Possible that it will pre-load correctly but still make noise. Only way to know for certain is to inspect.
Well i just got back fromt he garage, took the cover off and everything was still in great shape. I pulled the driveshaft and the nut that holds the yolk that slides on the pinion was only hand tight, apparently they didnt tighten it up.....so im thinking that may have been my problem, as i havent driven it since ive tightened it up. But could that have been the cause of the howling noise?
wmburns
SN Certified Technician
YES........
Will assume that the pre-load was set correctly.
If the nut was never tightened, then the crush sleeve is still good. If on the other hand, the nut backed off, the Crush sleeve must be replaced. Otherwise, the pinion pre-load will not be correct.
When I replaced the front pinion seal on my ride, I over torqued the pinion nut. This made the pre-load too high. Months later, the rear end started making noise. Upon tear down, found the bearing wore out on the edges. A direct result of excessive pre-load. Leason learned ($650).
Will assume that the pre-load was set correctly.
If the nut was never tightened, then the crush sleeve is still good. If on the other hand, the nut backed off, the Crush sleeve must be replaced. Otherwise, the pinion pre-load will not be correct.
When I replaced the front pinion seal on my ride, I over torqued the pinion nut. This made the pre-load too high. Months later, the rear end started making noise. Upon tear down, found the bearing wore out on the edges. A direct result of excessive pre-load. Leason learned ($650).
do u have any idea what is supposed to torque at? I looked in my repair manual but it didnt say. Also yes my car is lowered 2 inches with eibachs
wmburns
SN Certified Technician
The pinion pre-load for USED bearings is 8-14 INCH POUNDS.
Tighten the pinion nut to say 60 Foot pounds. Test the pre-load. Add 5 foot pounds to the nut and retest the pre-load.
Continue until the pre-load is within the specification.
A beam style inch pound (or electronic) torque wrench is needed. You are measuring the turning force of the flange. Note, remove the wheels and brakes.
Note, the crush sleeve is a one use thing. Do not reuse. It will give incorrect pinion pre-load.
Tighten the pinion nut to say 60 Foot pounds. Test the pre-load. Add 5 foot pounds to the nut and retest the pre-load.
Continue until the pre-load is within the specification.
A beam style inch pound (or electronic) torque wrench is needed. You are measuring the turning force of the flange. Note, remove the wheels and brakes.
Note, the crush sleeve is a one use thing. Do not reuse. It will give incorrect pinion pre-load.
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