Hello all, I just recently got a 03 supercrew with a 4.6 and 3.73s. I don't tow at all and the truck has plenty of power to spin the 33's into 2nd. I was wondering what y'alls opinion on putting 37's on the truck would be?

 

3.73s with 37s is going to suck!

I have 4.56s with 35s but also have a 5.4l motor. It's adequate.

also, without a programmer or a recalibration unit, your speedometer/odometer vs. your actual speed/mileage will be quite a bit off....

 

 

just for comparison, 235/75/15 is what my old ford explorers had, with 3.73s......

35 and 37s will definitely not be adequate for 3.55s... but to each his own, I mean I guess it's cool if you like no acceleration and awesome highway mileage......

the power programmer is not going to help with not having the correct gear ratio to begin with.....

 

 

Heck, I noticed a difference in going from the stock 235/70/16 tires to 265/75/16 tires with a 97 F150 with the 5.4 and 3.55 gears.... Right out of the tire store, within minutes of getting the slightly taller tires... Had to re-cal the speedo gear too.. (97 still had an actual plastic GEAR to drive the speedo).

But, after I got used to it and the speedo was set to the correct actual speed, at least the shifting was much better and over time, I just lived with it..

As was said... It's all about how you personally feel about the "lugging" you will get with going to taller tires and having the same gear set with the shorter tires..

You can put 37's with 3.15 gears and get down the road.. Just depends on what you intend to do with the rig and go from there..

Good luck!

Mitch

 

I had a 2wd toyota back in the day... it had 3.07 gears and 31s..... good thing it was a stick and I could just rev the heck out of it.......