OK the rear seems fine when cold and if i drive under lets say 10 miles...but anything more.....when turning slow...makes a noticible clanging....I'm wondering if it just needs new fluid with GM additive....the rear isnt that old..at all....could i possible get any advice...or things to look for when i drop the rear cover?
if i power brake it...slow or fast....both tires spin please help
nathan

 

Is there even any additive in there? You could probably try and add some more and see if it helps.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen

1987 Trans Am 305
14.88 @ 92.81

 

Sounds like it is lacking the friction plate modifier. I would still take the cover off and look things over, though.

New fluid can't hurt. My favorite is AMSOIL Series 2000 75W90 gear lube. It doesn't need that expensive little tube of additive (already has it in there), and is highly superior to any petroleum-base gear lube for protecting the rest of the diff.

------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).