Just drain the oil out of the axle and drop the rear cover and look at the staming on the gear and it will tell you the ratio.
Then replace the cover and put new lube back into it.
That lube probably needs changed anyway............
Or you could just jack the car up, count the rotation of the tire to the driveshaft rotation. should be 1 rotation vs 2.73
83 GT 5-speed. 393 stroker H/C/I. original trans.... yea
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