rkg8554

iTrader: (10)

I used the search feature and could find nothing about my noise. I have a 9 botl with 3:27 ratio. When I am on the gas or hitting the brakes everything sounds fine, no noise's that I can hear, but when I am coasting it sounds like a buzz saw, step on the gas or the brake and noise go's away. I just put the rear in the car, Swapped from a 10 bolt drum to 9 bolt disk. Opened the rear before installing and everything looked good. Fluid was old but no signs of metal shavings. Replaced all bushings with polyurathane bushings. This is a posi rear.

TTOP350

iTrader: (8)

Your going to have to check the coast side pattern and pull rearend completly apart to check all of your bearings, just to make sure.
Good luck

rkg8554

iTrader: (10)

How do you check the coast pattern ? Any idea how much to have this checked ?

white gold 88

RKG, mine was the same way. I put the additive from GM in then drove it for a while and it quit whinning. Was told later that you didn't need the additive if you use synthetic fluid. Good luck

rkg8554

iTrader: (10)

Well this noise is more than a whine, you can actually feel it.

white gold 88

Mine wasn't that bad. You may need to check that out. There are a few threads on here about these rears. I just pull the axle and take it somewhere. Don't know squat about the inside parts. LOL

8t2 z-chev

make sure the pinion bearings are tight enough-if
someone has changed pinion bearings and didn't get
correct "crush"on the crush sleeve or the nut has
worked loose,mesh will be affected during "coast"and
cause the noise.

rkg8554

iTrader: (10)

Thanks, Is this the same nut that holds the yoke on. Reading a lot of the post they say to tighten to approx 20 in/lbs that sounds light to me, converted that's approx 1.7 ft/lbs

TTOP350

iTrader: (8)

Yes and thats a assembled pinion rotational tq spec.
What it means is they want the pinion/bearings/yoke/seal (without the carrier/ring gear in) to have that much drag/TQ when its rotated with a TQ wrench.
It takes some crush sleeves 3-500lb-ft to crush. then snug the nut a bit and check the rotaional TQ. Repeat as needed.
A factory service manual, a search here or on the net will have good info.

trevor1010

DID YOU FIX THIS ISSUE?