Tires
 

I'm looking to run 37 x13.50x22 inch tires on my truck will the factory 3:55s be okay for these?

Ok in what regard? Are you planning on towing? Truck will handle them without regearing but you'll notice the difference for sure.

I am running 37x12.50x20's with 3.55s. Like Bill said it handles the tire fine but pulling my 5Klb excavator on a 3k lb trailer you notice the power the tires are stealing. Its not gutless but you do notice the loss of power compared to stock. I will be swapping in 4.10s as soon as the pocket book gets replenished. Keep in mind you will have to deal with the tpms issue if you swap tires. Some say the dealer can adjust the trucks setting to get the low tire light to go out but you have to find a dealer that will do it. I guess you can buy a programmer but Im trying to stay away from that if possible. But it may be my only choice when I do the gear swap.