I agree.. i would talk to an expert at a shop or elsewhere..

 

I am what you might call a cruiser. But trust I do my homework which is why I started here asking questions. The truck is expensive enough without adding a bunch of needless repairs...having said that, I will be practically a professional on it before it gets done. If you going to do it, may as well do it right.

 

I'm running 38.5x14.50 with 10" steel rims. I have a 6" lift and 2" body lift to space up for cage to frame mounts. Gas milage wise, I've been getting 19-20mpg with my 7.3. 14 around town pulling a 10' tool trailer. I wish it was geared lower but that is bucks I don't have, I have the six speed manual trans so there is always low gear. They do spin when the turbo spools up. My opinion, form follows function. 36" or 37" would be as tall as I would go. Just getting in and out is an ordeal. But it looks cool?

 

Def looks cool!! I'm a young guy (not calling you old btw) so I can easily get in and out of it. I may stay with 37s, because I love to travel, not sure how it would be taking long road trips on the 40s? I went to a show last night guy had 10" lift and 40s. Seems like around here in the South, if its not 10" lift you are in a lowrider!! lol

 

On these trucks, at 8" of lift, you start having to drop some serious money, extending drivelines/brake lines/vacuum lines. Crossover steering is recommended at that point, pinion angles almost become too steep, etc. To me, it wasn't worth all that added expense so I ran a 6.5" lift with 37" Toyo's, perfect combo imo.

Wheel bearings and ball joints will need some extra attention as well, they wear out fast with the larger tires.

Since you have a diesel, you could get away with not regearing with 37's but you will definitely notice a loss in hp/tq.

What's your budget?

 

I bought my truck at Christmas in Tehachipi ( I live in Modesto,central Valley), It is basically as I bought it. It has 165,000 mi. The steering was super loose. Considered a crossover set-up but $700 later and waiting for them to make it with no garrantee it would fix the problem I looked on this forum (good thing I did). I put a Redhead gearbox in and it drives like it should. Only replaced the pitman arm rod end. I would love to have 40's but I use my truck daily for work. In and out all day. My wife hates it but whats a guy to do. I'm looking to go 36-37's but cant't find a set as wide as I would like without spending $500-700 each. The Pro Comps AT I have now are quiet, important to me as I like to travel too. Big tires do make for a softer ride. I have no body bushings so I can use all the rubber I can get. Good luck and keep us posted on your decision(s).