what type and size of gear should i go with for 37x13.50x20 tires. i am hopeing to trade this guy and i know i am gonna need gears. atleast that is what i am thinking do i really. please all helpful hints help

 

4.56's or 4.88's. If you have a 5.4, you have the 9.75 rear axle and a reverse cut 8.8 up front. If you have a 4.6, it's 8.8 front and back.

 

4.56 or 4.88 gears are what you should get. Judging by your name, you have a lariat 4x4, that would mean you have a 5.4 so you would have the 9.75" rear axle and all 4x4's have the 8.8" IFS front axle. You need that info when you buy your gears. New gears and install will run you about 1500-2000 on a 4x4 cause you have to do F&R.

 

really that high dam i was hoping it would be a little bit easier on the wallet hehe. how soon after i put them on should i get them... or should it be immediate
???

 

Well since you already running 35's and I would guess you still have the stock 3.73 gears, putting 37's on would not be that big of a deal. You should seriously consider getting a programmer to reset your speedo for your new tires and eventually your new gears.

 

i have the programmer for the tires i am just hoping to find a good deal on somegears hehe...

 

4.88s

 

What he said. I went with Yukon 4.88's for my 37/22 combo.

 

there is a formula for this. new tire size divided by stock times current gear ratio this is what it takes to get to back to stock but you have to consider wind drag on a bigger truck and the extra weight. My truck for ex: 35/32*3.73= 4.0796875 so i would go with 4.11's to get it back right but 4.56's to really the the truck

 

4.56's is what I run on 38's. Had a buddy who was running 37's and 4.88s and his top speed maxed out at 89mph. While mine is WELL over 100.

 

89mph with over drive 37's and 4.88 Ya right! I would believe that if he had a 3spd with no overdrive....

 

well thanks alot guys i am getting a 6'' suspension lift int he next couple of weeks so i might have to wait on the biggger tires unles i can trade someone... but we will see thanks