I think after 85, most GT mustangs came with the 8.8 (i could be wrong).... as stated on here before, the diff cover on a 7.5 has rounded sides and the 8.8 has flat sides. easy to determine if you look at the cover. my 84 has a 7.5.
for gears, it's totally up to you, kinda like asking which came first the chicken or the egg... I think the best all around gears would be 3:73's (my opinion). then there are the 3:55's or 4:10's but it depends on what you use the car for and what your future plans are.......
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Black,84 GT,ground effects,shorty headers, 'open' dual exh.,302 HO(no pollution control crap)bored .060, 10.5" clutch, T5,89 ported heads, edelbrock Performer manifold, Edelbrock 2122 cam, 600 Holley, high volume oil pump, front P235/60/R15's, rear P245/60/R15's.....
Some day (3:73 gears & N2O)!!!
will this ever end????
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