Thread: what is the Rearend gear ratio

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Yeah I want ting to know what the Rearend stock gear ratio is in a 1991 Mustang GT (fox Body) for my brother in law

But also need to know the stock Rearend gear ratio in my 1995 Mustang gt coupe

you have a couple of possibilities.

Get the axle info off of the data plate on the door jamb. Then we can determine.

if it doesn't have posi, jack up one wheel and turn the tire one rev. and mark and count how many times the drive shaft goes around in one tire rev and double that number 1.75 of the axle would be 3.5 etc. Ed ke6bnl