I just wanted to know approximately how many quarts of 75W90 would be needed to refill the rear differential casing. I have a 1986 camaro TPI.

Joe


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86 IROC TPI 305
700-R4
K&N Air filters
Next mod = trans-go shift kit (level 1)

 

Just under 2 quarts. Don't forget the posi additive: put it in first, then fill it the rest of the way with grease.

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"So many Mustangs, so little time..."
ICON Motorsports

 

I have never used grease I did not know it could help. well anyways it would take about 2 1/2 with the additive added to one of the bottles. I just changed mine.

 

Is the posi additive already mixed into the synthetic oil types?

Joe


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86 IROC TPI 305
700-R4
K&N Air filters
Next mod = trans-go shift kit (level 1)

 

no it is not already mixed but, like he said above use the gm additive they made it for what you have. not what some other company thinks you have

 

Not so fast, 88 350 tpi formula.

I know for a fact that you don't need the additive if you use AMSOIL Series 2000 75W90. Their older formula often doesn't need it, but just add it "if needed". Personally, I just started with the stuff I knew was complete as-is.

Can't speak for other synthetics.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/LB9 block, ZZ3 cam and intake, TBD heads, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.