09 f150 stx 4x4 4.6l 2v v8, want a 6" bds with 37s and 20s.. would i be ok running stock gears for a month or two? id be taking it extremely easy on the truck until i got it regeared but would i be ok? ive got 35s now but want some 37s and 20" rims.. after regearing would i be back to stock speed even on highway? i go up to NC alot so any advice i would be grateful...

can i run 37s with 20s without regearing for a couple months if i take it easy?

and if i regear will i be back to stock even with the small V8 ive got in my truck?

( wont be driving truck anywhere but around town until new gears are in)

 

I'm sure you'll be ok for a few months, it won't self destruct as soon as you start moving but I wouldn't want to wait any longer than that. What gears are you going to? If you have 3:55's now and get 3:73's it won't make any difference. If you're getting 4:56's it should be very close to stock, maybe a little better off the line.

Driving around town will be the hardest on it.

 

ive got stock 3:73s right now.. so i should be good? and after regearing even with the 37 inch tires ill be able to drive interstate speeds? im gonna talk to my shop and see what they recommend but ill be going either 4:56 or 4:88s

 

youll be fine, its going to be a turd but thats it and when you do regear go with 4.56s since 4.88s are too much for just 37s

 

alright cool thanks guys.. will the 4:88s make it faster or just hurt it?

 

They won't hurt it but will bring you're RPM's up quite a bit which will hurt you're wallet when on the highway. If you're planning to stay with the 37's get the 4.56's.

They won't make it any faster either. You'll have more low end power and lose you're top end.

 

but ill be able to run highway speeds as i did stock? i drive alot of highway and tow my ATV

 

Ya, you'll be ok.

 

I'd run 4.88's with 37's at least, that's a lot of added rolling resistance you're adding.

 

Oh ya you will be fine trust me..I ran my 5.4 on 38x15.50r20 TOYO mt for a few months before i could afford front/rear gears. It's just gonna be a dog tryin to get those babies movin.

 

4.88S IS TOO MUCH FOR 37S, If you plan on highway driving it will kill your mpg

 

4.88 is *NOT* too much for a 2v 4.6 with a 4 speed with those tires. Just the lift and tires is going to kill both your power and gas mileage no matter what you do.

 

his rpms are going to be high when traveling on the highway, 4.56s will move it just fine

 

sorry to jack a thread but i have a similar question. just did a 6" lift and 35 with a 3.55 rear end. feels a tiny bit more sluggish so i wasnt ging to do gears. by not doing geas will this hurt anything?? tranny etc etc?? just dont wanna mess anything up. thanks

 

4.88's for that 4.6......