Hey guys i am going to be lifting my truck here in the next couple months and will be running 35's. My question is what exactly do gears do for our trucks? If i am running 35's what gears do you think i should get? Any other information is much appreciated guys.
thanks.
-Mike!

 

In essence, you add more teeth to the rear end to make it easier for the truck to move the larger tires from a stand still.

 

What gears and tire size do you have now? You can get the axle code from the door jamb sticker.

 

Right now i have the 3.73ls. I was thinking about the 4.10's but im not sure what would be best.

 

3.73 should do alright for 35" tires. I have 35" tires with 3.55 ls gears. i have the 4.6 so there is something left to be desired but it still drives and tows fine. if i was you though i would get a gear calculator and it will give you correct gear ratio to return you to stock gearing.


try this calculator http://therangerstation.com/tech_lib...tioChange.html

 

35 inch tires and 4.56 gears seem to be the popular option. You will not gain much going from a 3.73 to a 4.10, not a cost effective move. 35's and 4.56 gears will run just a few rpm's higher than your 3.73's and stock tires, essentially a little better than stock performance.

 

Thanks a lot guys. Much appreciated. About how much will 4.56 gears cost me? I do have a 4x4.

 

About 450 in ring and pinion sets
300 in Install Kits
80 in Gear Oil
xx Sales Tax
300-1,000 in installation costs

The kicker is install. This is inherently a simple straightforward job but has almost zero room for error. Those teeth have to be set up perfect. Not to mention that the install cost almost covers the amount of money that you would spend on all the special tools needed.

Shop around for gear installs and do not pick the cheapest one. Pick the reputable shop that will warrant or at least stand beside their work and is not trying to hose you on prices. An experienced friend could also be a solution.

One thing to keep in mind, you can do each axle seperately. Just DO NOT USE 4 WHEEL DRIVE. Your transfer case will explode! Well probably not, but it will not like your driveshafts spinning at different speeds.

 

4.56 with the 35's

 

4.88 with 35" tires = MUCH better ! ! !

Why pay for an "upgrade" to get back to stock. Why not ADD more torque to the rear wheels ? ? ? ? Maybe just be, but I want MORE. Use the search function, I know I have written up a long **** thread on how gears work and why you want lower ones.

tnsilverfx4: Where did you buy your gears ? Master install kit ? And how is that locker treating you ? ?

here ya go, found one:
https://www.f150online.com/forums/sh...d.php?t=319531

 

thanks a lot man. so do you think 4.88's should get the job done with my 35inch tires? Im probably lookin around 1500$ for the install huh?

 

4.88's would be awesome and would give you a little extra "umph" off the line. They would also allow for bigger tires if need be later down the road.

$1500 for install sounds about right.

 

sorry i completely forgot I even had those..............

YEAH 4.88's Its fast as hell off the line. I have Yukons in both axles with the generic master install kits with Timken Bearings. I had my work done at 4WP here in memphis. People on here bash 4Wp quite a bit for their impersonal service and bad attitudes. I guess us memphians just got lucky. 1500 is a good estimate for both axles. Mine was much more because I got Yukons, an Auburn Ected selectable locker, a mag hytec differential cover, Royal purple in both axles, the shebang.

Mercedes: I love it. The limited slip is plenty aggressive enough. The locker is just "assurance"...............

Yes 4wp sells yukons, just not on the website

 

I think I am going with a detroit locker out back... not sure if the selectable is worth it ? ? hmmm...

 

If you spend any amount of time above 65 MPH, steer clear of the 4.88's. 4.56's with 35's are a perfect combo. City and highway MPG will be near stock and "power" will be slightly better.

35's and 4.88's traveling at 75 down a highway... Would eat the gas like no other.