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Q:

how much gear oil for a 8.8 rear differential on 1990 Ford Mustang GT

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how much fluid does it take
(2) Answers
The 8.8 takes 3.8 pints of 90w but they came with either a standard differential or limited slip and will need the right gear oil for the type of rear end it came with. ( Positraction or no posi )
Rear Differential, With 8.8 RingGear - 3.9 pints
You can get this and all the fluid types and quantities here: http://bit.ly/5k7rcr