1987 Formula Differential Change
#1
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Car: 1987 Firebird Formula
Engine: H305
1987 Formula Differential Change
I plan on changing the rear differential fluid in my 1987 Formula Firebird and need to know what fluid to use.
It is a stock rear end, and I know that it likely was never done by the original owner.
Can anyone please tell me what fluid to use? Capacity?
It is a stock rear end, and I know that it likely was never done by the original owner.
Can anyone please tell me what fluid to use? Capacity?
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Car: 1987 Firebird Formula
Engine: H305
Re: 1987 Formula Differential Change
Thanks.
I have no idea if it has the limited slip differential though. No build sheet or data from original owner.
I have no idea if it has the limited slip differential though. No build sheet or data from original owner.
#4
Re: 1987 Formula Differential Change
If it has the 9 bolt Borg Warner rear end then it's almost certain that it does have it. If it's the 10 bolt then it could be either way. Do a burnout and see if both tires spin.
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Car: 1989 Pontiac Formula 350
Engine: L98
Transmission: 700R4
Axle/Gears: BorgWarner 3.27 Posi
Re: 1987 Formula Differential Change
For the 9 bolt, do not use the GM non-slip additive.
For 9 bolts w/ posi:
Torco A248514CE 85W-140 (need 2 bottles)
Torco AFM0050JE Type F Limited-Slip Additive (1/2 bottle or full bottle, suggestions vary)
For 9 bolts w/ posi:
Torco A248514CE 85W-140 (need 2 bottles)
Torco AFM0050JE Type F Limited-Slip Additive (1/2 bottle or full bottle, suggestions vary)
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Car: 1990 Formula Firebird
Engine: 305 TBI (LO3)
Transmission: WC T-5 out of an 88 T/A
Axle/Gears: 10 bolt, 3.42 & Torsen Posi
Re: 1987 Formula Differential Change
You will know when you pull the cover. Makes it hard to buy supplies in advance, but you could always buy the additive & return it if you don't have limited slip.
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Car: 1987 Firebird Formula
Engine: H305
Re: 1987 Formula Differential Change
Makes sense. I also saw that you can tell if you raise the rear end, spin one wheel, and see if it spins in the same direction.
Is this right?
Is this right?
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