just a lil bit of info on some 3.90 gears - Ford Mustang Forum
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post #1 of 2 (permalink) Old 07-15-2008 Thread Starter
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Thumbs up just a lil bit of info on some 3.90 gears

after ordering some stange eng. gears and ending up with the motive crap gears ( which now sound like a lil pigglet ) i started looking for other options ..........i just got off the phone with pro 5.0 and they told me they're gear sets will work in our cars with no problems , i believe stl had said richmond and huhhhhhhhhhh some other 1 worked too but cant remember it lol so anyway just wanted to let you fellas know there is another option if you want to run 3.90's .........oh and if you ordered the replacement machined bushings they will be delivered some time this week they're machine was down and the customer serv. people did not know but they're back up and running now ...........peace

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post #2 of 2 (permalink) Old 07-15-2008
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i went 13.3 at 105 with the stock 3.55 and that was last year around AUG with the same mods i have now....this past fall i had 3.90's put in and i run .2 slower...why is this..same track colder air same mods..shouldnt i be faster....i thought to myself that maybe i need some DR cuz im having to shift into 4th just after the 1000ft mark maybe thats why im slower im crossing at a low RPM

JLT II, Brenspeed 93 octane tune, Motive 390's, Steeda UDP, Pypes long tube headers, o/r X, Flowmaster American thunder series, Helix throttle body spacer, 12.921 @106.42 2.178 60ft
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