is 5speed the same?
 

is the 5 speed in the 84 gt the same as the one in the 89 or 87? same ratios?

I know that any T-5 from 85 and up can be rebuilt with the same kit, even though they have minor differences. So I would have to say they are different.

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87 GT, BBK shorty's, offroad H-pipe, ASP pullies, 70mm T.B., Cobra intake, no smog pump, Windsor Jr irons, Comp cams 1.6 rollers, F303 cam, H.D. export W.P., Tri-Ax, FMS subframes, Battle boxes, SSM liftbars, FMS King Cobra clutch, mass-air conversion, 73mm C&L, 24lb injectors, BBK fuel pressure regulator, 3/8" no EGR spacer, and other piddly sh*t.