Hi,
The number on the diff cover begins with "75", instead of "88", I think. Also, an 8.8's cover looks like a square with rounded corners, while the 7.5 is a stretched oval with the top and bottom straight and the sides curved.
thanks fellows, i found out today that it is a 7.5 out of an "85 mercury turbo coupe. thats afew more hundred dollars, i wanted to have a reason for a 5-lug conversion anyway.
thanks
you can have respectable times with that 7.5" rear but if you plan on a beast i would get an 87-88 tbird turbo coupe rear, its 8.8" trak lok with 3.08 or 3.73 gear depending on what tranny was in the tbird. good luck
Jim
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Pulled up to the light the other day and a 3 year old on his big wheel looked over at me and then at the light. I knew that it was on. The big wheel was hooked up, rims, sickers,ground FX, the works. Just before the light turned green the little ******* pointed to the NOS sicker on his machine and left a plasic patch that lasted about 100ft. I didn't stand a chance, I was smoked. He rasied his fist in victory and when home for milk and cookies, I just went to the track. :rolleyes:
A 7.5 will handle up to about 400hp before it will give out. If your worried about having the 7.5
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Black,79 Mustang mostly carbon fiber/kevlar body, M-2300-k brake kit, full roll cage, maximum motorsport suspension, custom geared 6 speed, 2 inch rear fender flares, 1 inch front, motor being built (no eta). Looks like the Mad Max interseptor and weighs about 1800lbs w/o motor (450hp 351w installed to move the car around)
Black, 82 Capri RS 5.0L, B303, 1.7 rockers, World 180 heads, +150hp N.O.S, Turbo coupe rear end, T-56(tremec tko would be beter), 80 cobra nose
i've never heard of a 7.5 that can take the torq from a 400 hp motor. my brother broke his 7.5 on the stock 83 175 hp motor 15 years ago when the rearend was new. are they making beefier gears now for the 7.5?
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1966 mustang 302 ho b303, 650 double pumper, t-5 conversion ported e-7 heads, 1.6 motorsport roller rockers, 3:55 posi trac, holley red electric fuel pump. 1994 lazer red 'ol red' very dependable daily driver mostly stock(but not for long)
Originally posted by Groove i've never heard of a 7.5 that can take the torq from a 400 hp motor. my brother broke his 7.5 on the stock 83 175 hp motor 15 years ago when the rearend was new. are they making beefier gears now for the 7.5?
Yup! I have a 7.5 and it handle 300hp fine. As long as you run a tire that is not sticky (like a drag tire)and will break loss under heavy touque. I've heard of 450hp if you realy brace the diff. housing and run aftermarket gears. I'm not sure why you would want to spend time even tying to. Less mass to spin I guess. 8.8 are so cheap.
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Black,79 Mustang mostly carbon fiber/kevlar body, M-2300-k brake kit, full roll cage, maximum motorsport suspension, custom geared 6 speed, 2 inch rear fender flares, 1 inch front, motor being built (no eta). Looks like the Mad Max interseptor and weighs about 1800lbs w/o motor (450hp 351w installed to move the car around)
Black, 82 Capri RS 5.0L, B303, 1.7 rockers, World 180 heads, +150hp N.O.S, Turbo coupe rear end, T-56(tremec tko would be beter), 80 cobra nose
8.8 or 7.5 rear end 
if thats the case the diff comes out the front of the housing .
