I have a high low whine that seems to be getting worst, it only happen under coast going down hill or coming off throttle. This seems to be a common problem with the BW is there a fix?



yes I did a search but did find a answer to my question

 

migth want to pull the cover and take a look, check back lash, preload, and the bearings.

 

Most likely pinion bearing preload is too little.

Miles

 

What does it take to solve my problem, shims? also what special tools if any are needed, or do you have a idea on how long a shop time would be??

thanks for the input

 

Yes, special tools are needed. To properly set the pinion preload, the carrier must be removed. You can try just tightening the pinion nut, but you will never know how much preload is on the bearings. Too much and they'll burn out, too little and you have the same problem (which can lead to gear failure or worse).

Miles

 

Just tighten the pinion nut back up. Mine is making noise now, but I've been beating on it with et streets.

 

is there a tq setting for the pinion nut??? what makes it back out, is it because it tighten CCW?

 

The torque is setting by measuring the rotating torque of the pinion when seated in the bearings, not by the torque on the pinion nut. That's why the carrier has to be removed to properly set it up. When you tighten the pinion nut, put some loctite on it.

Miles

 

So do you tighten it CW, Also what makes it back out, seem to me if it rotates CW it shouldnt back out

 

you can always try a fluid change first. When I bought my GTA there was a rear end whine and a leaky diff cover. Only a very small amount of fluid came out when I pulled the cover. I put new fluid in, and within a couple weeks my whine disappeared and has been gone since.

 

CW, indirectly it is vibration (loosely stated), directly, it's anything from not enough preload, to embedding, to thread relaxation, to thermal variations to...... One of (if not the best) methods to prevent fasteners from loosening is to use a chemical bond on the joint ie a Loctite or similar. One of the worst methods to use is a split lock washer.

Miles

 

since I cant set bearing preload, what would be your BEST educated guess once the pinion nut is tight, 1/4 1/2 full turn more. I dont want to smoke the pinion bearing but I didnt like the alternative problem

Thanks for the education

 

May also check the teeth on the ring and pinion, I had the same symptoms, and i had a broken tooth on the pinion.