Differental fluid?
Thread Starter
Joined: Jan 2009
Posts: 539
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From: Texas
Car: 1991 Trans Am GTA
Engine: 350 tpi
Transmission: 700R4
Axle/Gears: 3.42
Differental fluid?
hi i was going to change the fluid on my differental its a limited slip with 3.42 gears i wanted to know which fluid i should use to do it thanks!
Moderator
Joined: Jul 1999
Posts: 17,268
Likes: 169
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Differental fluid?
GL5 (80W90) and put in the GM posi additive (stuff really stinks)
If you want to use a synthetic, you can use 75W90 but I'd still put in the posi additive.
Capacity is around 2 quarts but buy 3 just in case it's slightly more.
If you want to use a synthetic, you can use 75W90 but I'd still put in the posi additive.
Capacity is around 2 quarts but buy 3 just in case it's slightly more.
Moderator
Joined: Jul 1999
Posts: 17,268
Likes: 169
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Differental fluid?
Oil, yes. GM posi additive, maybe, and if not, they'll have something similar.
The posi additive is required if you have a real posi using clutches or cones. If you have a gov-lock system, the additive isn't required.
The posi additive is required if you have a real posi using clutches or cones. If you have a gov-lock system, the additive isn't required.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Differental fluid?
GM’s limited slip additive is p/n 1052358. Your dealership will have it in stock.
JamesC
JamesC
Joined: Sep 2000
Posts: 2,504
Likes: 195
From: Moorpark, CA
Car: '91 GTA, '92 T/A Convertible
Engine: GTA: 350 w/Vortec heads, T/A: 305
Transmission: Pro-built 700R4
Axle/Gears: GTA: 3.27, T/A: 2.73
Re: Differental fluid?
If flushing all the fluid with Royal Purple, is the additive still needed? From what I've read, RP has an additive in it that negates the requirement for the additive. Is this correct?
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