Ok I have been told running two sizes (35 in year and 33 in front for example) can mess up your 4 wheel drive and I have been told it wont harm anything.Which is accurate...

 

As long as you only run in 2wd it is fine. You CAN NOT use the two tire sizes and run in 4wd. It would lock up or break something major before you go 20 feet. ALL 4 tires and rims need to match, for the best results. Even a weird rim can cause a binding of the running gear. If the rim is super wide and the other 3 are regular sized, the one weird wheel can lower the tire running height, thus causing a bind on the one side (wheel). The owners manuals say to never mismatch tires or tire sizes in 4wd or All wheel drive vehicles.

 

Thanks,I thought it could cause problems,due to the size diffrence the smaller set would rotate faster than the other set causing havoc on your gears,or atleast how i imagined it.

 

Exactly right.

 

I did just notice on Tirerack,They ask if you want one size for the rear and a smaller for the front.

 

Off tirerack.com

 

Well i have (2) 37x12.5 17s and (2) 35x12.5 17s ....Im not going not getting the after market torsion Keys ,so i think ill see if how much clearance the 35s have up front and proably sell/trade thw 37s..

 

With just cranking the T-bars, you won't get much clearance with 35's. You will not be able to run 37's without chopping a lot off the front end lol. The max recommended height for a stock truck is 24.25" measuring from the center of the hub to the fender, any more than that and you are killing your front end components.