and if so what do i need to do to make the computer work with them? can the dealer fix/reprogram it?

anyone have pics with 285/75/16 on there tuck without lift?

thanks

Jeff

 

The 285 will fit just fine on a stock truck with stock rims. You don't reprogram in 97-98 you have to change the speedo gear for a couple of bucks.

and also welcome to the site....

 

can you tell me where to get the gear and what part number to get to run the 285/75/16

thanks for all the help

Jeff

 

Just go to your local ford dealer and tell them stock size and the size your going to and they can help you out...

 

Hi there....I don't know how your dealer is, but mine wasn't terribly helpful on this point. If you look on the side of your tranny, you will see a toilet paper sized tube bolted to the side with two bolts, with an electrical harness out the side of it. If you remove this VOILA you will see your speedo gear. Count the number of teeth on it. Then I believe BFG's web site has an excellent calculator for tire sizes/etc. You will need to know your stock tire size, and gear ratio ie:3.55 Using their table will give you a good idea what percentage larger or smaller your speedo gear should be. (how many more teeth) I have had 285/75/16's on my truck for a year without this swap, but I'm finally doing it this week. I'll let you know if I get some better info, or run into probs etc. Hope this helps a little. BY THE WAY! THESE TIRES ROCK!!!! I HAVE NEVER RUBBED AND THEY HAVE GREAT TRACTION

 

I put BFG A/T KO's 295/75/16 on my 2002 supercrew with no lift. they fit fine. No rub yet. Pretty close however. Great tires

 

BF Goodrich recommends a 7.5"- 9" wide wheel with a LT285/75/16 AT ko. The stock 16" wheels are 7.0" wide.

 

LOL Doing it this week. Man I am having world's of trouble trying to find anyone who can help with this speedo gear. Ford dealers are such worms..... they refuse to help me because it isn't a recommended tire size blah blah

 

The largest tire diameter put on a stock F150 is 31.8" ... which is the 265/70R17. A 265/75R16 is the same diameter. Assuming you have the 3.55 rear end ..... Ford would not have a stock gear to correct for a "larger than stock" diameter tire.

It's not that the dealer is refusing to help ... they just don't have a Ford part/gear to go with the larger tires you want to use.

You can either live with it, or buy an aftermarket chip.

 

An aftermarket chip will not correct the speedo on a '97...as MAC[H]Z stated earlier.

 

I have the 265/75/16's (~31" tall) and I needed to drop just one tooth size from stock. Stock was a 20 tooth gear. I put in a 19 tooth gear and all was well again. My understanding is that Ford does have an 18 tooth gear and that might just be the ticket for a 285/75/16 (~33" tall).

They only cost like $10, and about 5 minutes to replace, so give it a try and I'll bet you'll notice a difference in how the truck drives as well......

Good Luck!