What Kinda Oil For Posi/traction?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67 CHEV MAN · 07-29-2003, 10:44 PM

I'M CHANGING THE GEAR OIL IN MY RIG,AND I'M CURIOUS AS TO WHAT KIND OF OIL YOU GUYS AND GALS ARE RUNNING IN YOUR POSI REAR ENDS.MAY AS WELL USE SOME GOOD STUFF SINCE IT DOESNT GET CHANGED VERY OFTEN.

crazy longhorn · 07-29-2003, 11:02 PM

I am running 75/140 Richmond synthetic. Most of the synthetics have a traction unit addative. If you use the "dino" stuff, Gm puts out an addative to add to the diff. Good luck,crazyL

*Phillip Johnson* · 07-29-2003, 11:49 PM

85-90 GL-5 and go to the dealer and buy the GM additive. The last is the important one. I have it in my Corvette and my truck. Without it, it will chatter. Its a GM thing. Cant tell you why.

69GMC396 · 07-30-2003, 12:49 AM

I've just always used 85-90 and a posi trac additive you can get at Napa.

07-29-2003, 10:44 PM	#1
67 CHEV MAN Registered User Join Date: Feb 2001 Location: Northern Oklahoma Posts: 276	What Kinda Oil For Posi/traction?? I'M CHANGING THE GEAR OIL IN MY RIG,AND I'M CURIOUS AS TO WHAT KIND OF OIL YOU GUYS AND GALS ARE RUNNING IN YOUR POSI REAR ENDS.MAY AS WELL USE SOME GOOD STUFF SINCE IT DOESNT GET CHANGED VERY OFTEN. __________________ 71 Cheyenne Swb 400/400 drivetrain. My EBAY Auctions

07-29-2003, 11:02 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I am running 75/140 Richmond synthetic. Most of the synthetics have a traction unit addative. If you use the "dino" stuff, Gm puts out an addative to add to the diff. Good luck,crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

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07-29-2003, 11:49 PM	#3
Phillip Johnson Account Suspended Join Date: Apr 2000 Location: Grants Pass, Oregon Posts: 1,580	85-90 GL-5 and go to the dealer and buy the GM additive. The last is the important one. I have it in my Corvette and my truck. Without it, it will chatter. Its a GM thing. Cant tell you why.

07-30-2003, 12:49 AM	#4
69GMC396 Registered User Join Date: Jun 2003 Location: Goldendale, WA Posts: 54	I've just always used 85-90 and a posi trac additive you can get at Napa.



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