Royal Purple Gear Lube Oil

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Apr 10, 2009 | 02:26 PM

KITT1983

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From: Boston, MA

Car: 1983 Pontiac Trans Am Daytona 500

Engine: Crossfire 305ci V8

Transmission: Jasper 700R4 4 speed Automatic

Axle/Gears: 3.23 limited slip/posi

Royal Purple Gear Lube Oil

GM recommends 80w, 80W90 GL5 gear lube, + GM additive #1052271 for limited slip differentials for my KITT. I want to use Royal Purple 75w90 Gear lube to my rear end, will it screw up my rear end? Should I add the additive or not? or use something else?

Apr 10, 2009 | 03:57 PM

five7kid

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Posts: 43,187

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From: Littleton, CO USA

Car: 82 Berlinetta/57 Bel Air

Engine: L92/LQ4 (both w/4" stroke)

Transmission: 4L80E/4L80E

Axle/Gears: 12B-3.73/9"-3.89

75W-90 is fine. Use the posi additive if your posi makes noise going around corners. Adding it before you know it makes noise is fine as well.

Apr 10, 2009 | 04:52 PM

danandamy

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Joined: Nov 2006

Posts: 248

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From: Tx

Car: 86 Camaro

Engine: 305

Transmission: 700r4

Axle/Gears: 3.73

Re: Royal Purple Gear Lube Oil

Royal Purple has the additive built in. Just pour it in and go.

Dan

Apr 10, 2009 | 05:35 PM

KITT1983

Thread Starter

Supreme Member

iTrader: (3)

Joined: Mar 2008

Posts: 2,942

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From: Boston, MA

Car: 1983 Pontiac Trans Am Daytona 500

Engine: Crossfire 305ci V8

Transmission: Jasper 700R4 4 speed Automatic

Axle/Gears: 3.23 limited slip/posi

Re: Royal Purple Gear Lube Oil

Quote:

Originally Posted by danandamy

Royal Purple has the additive built in. Just pour it in and go.

Dan

Did you use Royal Purple before and did you use the GM additive?

Apr 10, 2009 | 06:17 PM

akmusclecar

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Joined: Sep 2008

Posts: 238

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From: Anchorage, Ak

Car: 1988 Pontiac Firebird

Engine: 5.0 TBI

Transmission: W/C T5

Axle/Gears: 3.08 Posi

Re: Royal Purple Gear Lube Oil

I have been using royal purple for all applications, in all my vehicles. I am running it in my 88 bird, and i did not use any additives. I have the 3.08 W/ posi and it has been fine. I don't have any whining that i have heard about on these cars.