Hello. I have a 95 F150 4WD. I want to run 37" tires. The spare might have to be a little smaller diameter to fit under the truck in the normal spot. Anybody know if this would cause a problem for short distances until the regular tire can be fixed? Thanks.

 

If you have a limited slip, it will burn up the clutches in a short time

 

If you have to do it and you have a limited slip you could put the spare on the front and make sure you always have two tires the same size on the limited slip rear.

I could imagine that having two different size tires on the front could lead to interesting handling though, so if you do it, take it easy until you know what you are dealing with.

By the way, if you have a locker or a True Trac you won't wear things out as quickly as you would with a typical clutch-type limited slip (like the factory TracLoc). But I still wouldn't drive far or fast with different size tires on a locked axle.

 

Ditto on what has been said. If you get a flat on the rear, put your spare up front first, then swap the puffy 37 with the deflated one.

 

Your spider gears in the rear will NOT be happy. Expected them to catastrophically fail on you.
Ask me how I know.

 

Hey, Puddy. How do you know about catastrophic gear failure due to tire size?

 

Hmmm. My truck is 4wd and the rear is LS. If I put the small tire on the front so I don't burn up the rear clutches, wouldn't I have the same type of catastrophic spider gear failure on the front that is stated above? Wouldn't the front have spider gears? I'm just getting started 4 wheelin with a truck and need to learn more I guess. Appreciate the help.

 

If you keep it in 2WD it won't hurt anything. With the 4WD system in these trucks the axle's are not spinning in 2WD so the diff doesn't rotate at all.

 

Are you going to run 37" tires on the stock half ton axles or are you upgrading to 1 ton gear? I would strongly advise against putting 37" tires on the half ton gear...

 

Not to mention there is not a chance your gonna get a 37" or anything close to that under there. Even if you did you wouldn't want to try and wrestle that thing out from under there. I just took my 30" spare out this morning and it was a pain, so much so I removed the entire carrier and my new spare will be going in the bed.

 

I originally posted it was a 95 F150. I meant 95 F250 4wd. Typo. Sorry. From reading the replies maybe I should try for 35" tires instead.

 

LeoJr - Grab handles? Where can I get those and where did you mount them? Got any pics? My wife is not happy getting in and out. Thanks.

 

33" is really the biggest you should go with the TTB front end.

 

I agree with this completely. Even on the F250.

Some people will tell you that up to 35" tires are OK with the F250s. Those people are not paying for the rapidly deteriorating parts you're going to need in a short time to get the front tires straight up and down every 10k miles. Not to mention the expensive tires that will wear the inside tread insanely fast.

 

Like Evan_P said, mount it in the bed. I built a custom vertical mount for the rear drivers side corner. You can order a factory one off Lmc too. Much easier to get than crawling under the truck, even for a factory size.