But how do I know what gear ratio I have to buy and what differential to buy that will be compatible?
Because I can hit 115 (my governed top speed) in the middle of 4th gear so I know it can go higher especially if I used 5 gear so I didn’t want to delete the governor if something was going to explode or become defective by going that high of speedFirst of all, I believe the "exploding driveshaft" issue was with the 2-peice driveshafts in the newer V6 mustangs and not your 2001 V6.
Concerning your differential, it should be a 7.5" differential with stock 3.27 ratio gears.
If I may ask, why are you concerned with a 140MPH top speed?
Check your door jam for a sticker, it should give you an axel code, post it here or just google it, that will give you your gear ratio the factory installed and go from there.
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