8.8 Rear
 

I'm putting 3.73 gears in my 86 GT. What type of oil is required, and do I need to put a friction modifier in the oil? Thanks for the help?

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John Welch
86 GT, 3.73's, H-pipe, No smog pump, pulleys, K&N, and still going.

Pretty sure it's 2 quarts 80w 90 and 4 oz. of friction modifier. If you don't use the modifier I've heard your trac loc won't fuction correctly.

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86 GT T-tops, AOD, B&M shift kit and hammer shifter, ROH wheels, K&N, Timing,MAC headers, 2.5 off road H, 2.5 American Thunder, 87 spindles, rear disc,SS lines, BBK 1.5, poly bushings, Steeda G-trac and subs, Strut bar.
"DRIVE LIKE YOU STOLE IT!"

I used two bottles of Red Line 75w90 ( I think) synthetic with traction lock additive. That'll do the trick. Otherwise I'd find a good synthetic gear oil 75w90 and get the traction lock additive from ford.

Hey Jon_68stang, did you put the gears in yourself? I'm going to be putting the same size of gears in my car, and I'm thinking of doing it myself. I was wondering if you knew the steps to installing...