Kowalski224

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Jan 25, 2018
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Hi I have a 2001 3.8L Ford Mustang first 9 of vin 1FAFP4047 I was wondering what I could do in the rear end to safely increase my top speed I heard that the driveshafts are only rated for 120 and under or they explode what else should I replace that can’t handle 140 also what differential do I have and what could I change it to?
 

Hoytster

I don't dare do that to my Knob
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But how do I know what gear ratio I have to buy and what differential to buy that will be compatible?

First 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?
 

Kowalski224

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Jan 25, 2018
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First 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?
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 speed