posi rear

**purplebat66** · 07-13-2009, 03:15 PM

do all 1998 trans am come with posi rears? thank you.

**JoshieDoom** · 07-13-2009, 03:51 PM

Originally Posted by purplebat66

do all 1998 trans am come with posi rears? thank you.

Yep.

Should be an auburn with yellow springs.

If your having posi issues, then swap out the fluid/ add limited slip additive and try it out.

Or live with a 1 wheel peeler till you upgrade like me

**purplebat66** · 07-13-2009, 05:42 PM

no its fine i was just curious and thank you so much.

**99'CajunFirehawk157** · 07-16-2009, 11:28 AM

Make sure if its an auburn unit do not put any synthetic fluid just dyno and for me 2 bottles of gm posi additive works best, IMHO.

**JoshieDoom** · 07-16-2009, 11:33 AM

Originally Posted by 99'CajunFirehawk157

Make sure if its an auburn unit do not put any synthetic fluid just dino and for me 2 bottles of gm posi additive works best, IMHO.

Why only dino???

**99'CajunFirehawk157** · 07-16-2009, 05:50 PM

Originally Posted by JoshieDoom

Why only dino???

Dunno, ask Auburn, something about the material they use, brass or bronze and compatibility issues...

from the web:

What kind of oil and additive should be used with an Auburn Performance Differential?It is important when installing
an Auburn High Performance, Pro Series or ECTED® LOCKER that a high quality non-synthetic 80W90 GL-5 gear oil
be used. Treat the oil with Auburn Gear, GM or Ford friction additive. Three ounces of additive treats one quart of oil.
Friction additive part numbers:
Auburn Gear: 504102
GM: 1052358
Ford: C8A219B546A