I have a 98 5.4 4x4 kcab f150 flowmasters, airaid turning 295.75.16's. I cannot turn the tires over. My son has a 97 4.6 4x4 kcab lifted f150 catback, turning 14 x 15's. He can turn over his tires. We both have 3.73. Anyone with any ideas as to why this happens. No backfires or stalling or hesitation on either truck.
Thanks for any insight anyone may have. I am stumped...

 

Reason I ask this question. I really don't care about turning over tires but it seems to me that it is an indicator of power to the wheels. I do care about power. I bought this truck with a 5.4 cause supposedly it had more power than a 4.6. I tow occasionally and don't think I am getting all the power I paid for. Anyone out there care to comment???

 

I'm not sure what size 14x15 tires equate to.

Have you considered the amount of traction, and grade of rubber, in each tire design, and made certain you both have the same transmissions?

And if your son bought the truck kitted-out, someone could have changed the ratios. Heck, I hope to change out my 3.73's sooner or later, too.

Off hand, I'd say you're right, but a better test would be a side-by-side WOT run from 10 MPH to 70 MPH. If your truck has trouble there, you've got problems.

 

The 4.6 truck is running 14" wide tires. The 5.4 is running 10" wide tires. Because the 4.6 is running 15" wheels it is hard to equate tires size cause the 5.4 runs 16" wheels. I am a newby to the mechanical side of trucks so I don't really know much about them. Sorry I couldn't be more helpful. I appreciate any input from the experts out there...

 

Wow, he's turning them with 14" wide tires, damn I'm impressed. I can hardly turn over my 285/75/R16 Xterrains which is only like 11.5" wide I couldn't imagine trying to turn over 14", in reverse they turn over just fine though. Does he have a power tuner or chip in that truck?

I don't really care about turning them as I want them to last and they're not meant for turning on dry pavement whatsoever. But I had to at least try it.

 

If you have 285's and they are 11.5" wide I guess I am running 12" wide tires at 295. No he doesn't have a chip or anything to make his truck any more powerful. He does have a catback exhaust but that is it... I thought his truck should not have as much power as mine. He has about 116k miles on his truck and I have 157k miles.

 

I have true dual exhaust on my truck and a K&N filter (I clean it every other oil change which is not necessary). I don't have tuner. I'd have to say there's something not right with your 5.4. I'm still throughly impressed about turning over those 14's.