Ubassfisher

got 3.73 limited slip about to put 35x12.5x20 on my 4.6 is that good or should i regear??

jerrybizzle

It will be more sluggish, but depending on how u use your truck may be acceptable. It will be harder on your drivetrain, but if u don't drive like a jackass it shouldn't be damaging to it. A programmer will help significantly to get speedometer and shift points back in line.

Pity7700

ive got the 3.73 rear with 35" BFGs youll be fine. its not much of a difference. your speedo will be off though. i would get a tuner and reset your speedometer plus you gain a bunch more tuning options with programmers.

Ubassfisher

yea i planned on gettin one... whats a good brand??

otto457

https://www.f150forum.com/f2/tuners-pcm-ugrades-124931/

jerrybizzle

Edge EVO Seems most popular around here and it can be upgraded to gryphon for custom tunes. I have diablosport predator and am happy with it as it has cai canned tunes. (factory loaded tunes for a cold air intake).