What is the biggest tire I can put on a stock F-350 crew cab 4x4?
the stock size is 235-85-16

 

A 285x75x16 will fit with no problems with the stock wheel. Some have used the 295's and 305's. If you add a leveling kit to raise the front you can use the 305's easily.

 

Lifting is no option. This is a company truck.

 

Hey,

Here is my 2002 F-250 4x4 with 305x75x16 ProComp AT's and they fit with plenty of room left over. Probably could have put on the 315x75x16's but wanted to keep some what of a lower gear ratio. But you will need new wheels either 16x8 or 16x10, I like the 16x8.

Here is a few pics of mine with 305x70x16 ProComp AT's on Eagle Alloy 143 series HighPolished 16x8's

Phil

 

Second Pic,

 

Be carefull of your load rating. You said it's company truck & probably is hauling a load

 

Here is my truck. It has 295/75/16 BFGs on 16x10 eagle 143s. The fit nice, and look pretty good too

 

This pic is w/ the Eagles. First pic was still on factory wheels