What brand of gear oil/tranny oil to use?

**patriot1136** · 05-12-2008, 02:38 PM

I want to change the gear oil and the transmission oil in my 6spd t/a. I would like to stick with the the fluid that GM uses. What brand do they use? Do I have to get it at a dealership? How much $$ am I looking at? I just don't want to get screwed over too bad.

**thearborbarber** · 05-12-2008, 03:24 PM

I use mobil 1 in the rear diff. and regular texaco dexron III in my tranny.

**INMY01TA** · 05-12-2008, 06:58 PM

Any Dexron III will work for the tranny. Dealership will sell you AC Delco fluids. I use Redline D4 synthetic ATF in the tranny and any dino 80/90 gear oil in the diff.

**bige97** · 05-12-2008, 07:03 PM

no one uses royal purple? is that a good oil or not

**va2001ss** · 05-13-2008, 09:22 AM

Whatever you use DO NOT use the new DEX VI. It will cause damage to our T56's.

**LS2Tuner** · 05-13-2008, 09:53 AM

Originally Posted by bige97

no one uses royal purple? is that a good oil or not

It's ok. We use AMSOIL in all the race cars. I also use the RedLine in the rear ends with the clutch type posi's.

The synthetic blends withstand heat alot better.

The fluid your talking about is GM's Syncromesh part #12345349 you should be able to get it for 9.99-12.99 a quart.

Penzoil makes a direct copy which is cheaper and Tremec will tell you to buy it.