The new 35" tires really doged out my truck 06 STX 4.2 v6 what size gears should I install ???

 

i would say 4.56 or 4.88

 

4.56 would put you about stock if you had 3.73. if you had 3.55 than it will put you about 50 or so RPM over stock

 

Actually 4.10 would be almost exactly the same final drive ratio as stock if you had 3.73 gears to begin with.

The formula is like this; New tire diameter / old tire diameter x old (or current) axle ratio = new axle ratio

That formula will simply tell you what gears you need to get the same final drive ratio you had. since you have the 4.6 I'd suggest going a size more for the extra power (i.e. 4.56)

 

How can I find out what my stock gears are , read the label inside of door ?
Old tires p255/65R17 new is 35+12+5
The oweners manual says 3.55 GCWR 4536 or 3.73 GCWR 4763
even stock it was a little bit of a god on big hills so I woulden't mint stepin it up a notch , I do a lot of freeway driving

 

your gears are probably 3.55. ok your old tire is 30" tall.
35 divided by 30 = 1.16.
1.16x3.55=4.11.
so 4.10 gears could put you very close to stock.

 

ok so to go one step more would be 4.56 ?

Thanks for all your help guys.....

 

talked to the local gear shop and they said 4.56 gears and $827.00 need to find some one cheaper this truck only has 10k millage so it does not need bearing work , need shop in San Diego

 

if you are not in a hurry to have it done and are willing to drive up to oceanside i will do it for you, cost you $400 for my labor no matter how long it takes me,(should only take me a day and a half) but i would have to wait a week or two for my work to clear up. the $400 does not include the ring and pinion or the install kit, i wouldnt need the master install kit just the minor install kit but you would have to make sure it comes with a pinion seal(some kits dont) i have done many RP on many diffrent vehicles. if you want to learn and help as i do the work i would knock $50 of install but you would be getting your hands dirty. this is the same price i charge to friends and is as cheap as i will go. let me know

 

TKS for the offer it will be a few weeks before I do any thing need $$

 

let me know if you are enterested and give me a date so i dont schedule anything else that day

 

Where were you when I needed mine?