what can go wrong??

[ROUSHDEMON]

First we need pictures..... and 2nd... You have to remember the offset of your wheels, what offset do you have? with that lift and tire size you wanna be no more than -24mm offset, prefferably in the -44mm to -50mm range in order to clear fine, if not as soon as you turn and flex you will rub.

Spacers.... I wouldn't get anymore than 30mm wide or you're risking them to brake with those super heavy tires, I didn't trust them before to go offroad but when I went to Windrock last year there was an H2 with green keys, 37's and spacers on and he said he never had a problem with them wheeling, never broke in over 3 years, and he went through advanced trails too.

Anyways, ... good stuff! post some pics!

[ROUSHDEMON]

Alright so... I just researched your wheels and if you've got 20" then you're running 20x9 wheels with -12mm offset.... Way wrong with those size tires.
You need at Least a 10" wheel (10-12"), and that offset needs to be at least -24mm or higher.
Spacers might help, but I would get new wider wheels all together, just my two cents.

[leekyraj2]

my wheels are 17x10. and the backspace on it is 4.5.....i can only put pix of what the setup looks like with the 35s cuz i could not drive with the 39s

[HumminNBoatin']

With Stock 4.5" backspacing and a Fabtech 6" lift you should be fine.

I am not a fan of spacers as the H2 already does a good job at eating hubs in stock form. But they are safe to use. Just put more stress on the hubs causing them to wear faster.

The 4:10 gears will hold up fine to larger tires but you going to miss allot of the low end torque you used to have.

My only concern when going to a 39+" tire is axle strength. I have 37's and can easily break a 1/2 shaft when I lay the throttle down.

Alot of the guys i know running tires over 39" always carry spare 1/2 shafts because they break them so often. My other worry is Diff and xfer case damage with tires that big too. I know the drive train on the H2 is stout and on a light weight buggy they would do fine with those big tires. But the H2 is a damn pig lol.

[leekyraj2]

so i am getting these 640 adapters made.....should have them in by wednesday....imma put those 39's and see what i break next. the way i figure if it breaks it needed to be replaced and was to weak for my taste. pix coming soon.

[leekyraj2]

so its finnaly done!! 39s with 2 inch spacers. the kick a$$ factor went through the roof!......just one problem. nobody around here can balance tires this big ...............so my next obstacle is driving 2 hours at 30mph to the off road shop.

[NJ H2]

Originally Posted by leekyraj2

so its finnaly done!! 39s with 2 inch spacers. the kick a$$ factor went through the roof!......just one problem. nobody around here can balance tires this big ...............so my next obstacle is driving 2 hours at 30mph to the off road shop.

I have been checking balance masters out for a future mod but haven't pulled the trigger yet. Maybe it's an option for you?
BTW: Nice set up!

http://www.balancemasters.com/hummers/index.html