Normally I would post this on F150online but since they site is down, I figured Id give it a shot here.

I have a F150 04 2wd with a 9.75 rear end. Im upgrading my rims and tires to 31.5". However 22" of that is Rims which will be about 35lbs each. Tires will be another 50lbs. Due to alot of rotating mass I want to turn in these stock 3.55s and possibly go 4.1xs, 4.3xs (if they make them), or 4.56. My truck is a performance street truck which I do 80% street driving, and 20% highway.

So my questions are is 4.56 to much gear? Truck has OD aka 4th. Also im at a loss to who sells gears for my truck, ive looked alot of places but cant find any. Any info would help out. I went from 3.55 to 4.10 in my ranger and I dont think I noticed a difference. Im kind of worried about going 4.1x and im leaning towards atleast 4.3x if not 4.56.

Thanks

 

What size tires came stock and what motor do you have?

 

Stock are 265/60/18 (30.51). New would be 305/40/22 (31.6) in rear 275/45/22 (31.74) in front. Motor is 5.4 3V (new body style F150).

Im going for go, but Id like to use my truck to drive on the freeway still to go up north and such, which is only like 3 times a year though.

 

That is a tough call, most gear calculators say you should be fine. I would plug you numbers into here http://www.grimmjeeper.com/gears.html and see what you come up with.

Also if it was me I would be looking for a brake upgrade with those 22's.

 

I'd throw in 4.10's for the hell of it. I don't think you need to regear for your new setup. I've got 15x10 steel wheels with 35" heavy radials......THATS heavy...yours isn't. lol.

When I was mostly stock, I was running stock 4.10's and 32" diameter tires and it was just fine and dandy. Although, we have alot of motor/truck weight difference, I think 4.10's is a good choice for "go" and "cruise".

 

what he said.

i know genuine gear and i believe precision makes the gears.

 

Yea I know, but when I really want to go, Ill get slicks. But my truck wont hook up with much on the street. Right now I make about 430HP/480TQ to the wheels and I really like the look with the 2/4 lower with 22s. (but thats only from 1 dyno with a tune, when I get it long tube headers and retuned Ill see what it truely is)

I realize that 35lb 22's with 50lb tires is going backwards, but Im trying to overgear to make up for what I would loose for adding weight.

 

if you over gear for the weight. then once you throw on some smaller slicks, you may run out of gear by the end of the track. unless youll be able to run a 30" slick.

 

I think I can get some 31.x slicks even. A buddy has some that I want to run, I think they are like close to 31.5.

I think ill just go with the 4.10s.

Thanks fokes.