just bought a 99 7.3 f350 with LT305/70 tires, will changing tires back to orginal 265/75 improve milage??'m thinking michelin LTX M&S

thanks

JR

 

Might see a slight improvement especially in towing/trailering applications.. Not interested in 285's? They look a little nicer in stock applications.. Have you done any MPG calculations yet?

 

Thanks your reply...hayabusa good one ...just bought a bmw k1200r love it...my buddy has a hayabusa...apparantly quite the ride...

I thought of going stock for the milage and the michelin LTX dosen't come in a 285...

jr

99 f350 7.3
98 volvo xc
85 landcruiser
99 grand caranvan 3.8 awd
86 taurus
05 bmw k1200r
98 suzuki 350 dxr
182u cessna

 

Ahhhh... But you said you were 'think'n' LTX...

I would think that the 265 would be better for low end power with a 4R.. Auto..correct?

 

yes it's an automatic...in my thinking large wheels would give u better milage...but i read that it's not the way it works??

 

I haven't had a lot of exposure running big tires on these S/D's.. Maybe someone else will chime in.. But, have had plenty of time under the hood, and behind the wheel.. The problem would be where the power/torque to gearing/speed would be, as well as load affects if any.. If you were to run at cruise speeds consistantly, no grades, unloaded, then larger tires 'may' yield a better mileage.. But, most times when I've pulled or driven, the 4R has what I call the 'dead zone' when speed is low (35-45) and the converter locks keeping RPM low, as well as turbo boost pressure/s, and power goes flat and suffers.. So,, the natural reaction is to shove your foot to the floor even harder to bring the power up, or kick down the shift unless OD cancel is selected.. more so with larger tires or load...and IMO would hurt mileage since most owners do a fair amount of city driving.. Plus,,these trucks are like pushing a 8K 'brick' through the air, and if peak power/torque at specific throttle angle/s isn't met more consistanly (think best torque is 1600-1900 RPM, and best peak HP is about 2600) than available power to load to falls off....

 

I just bought a 1996 F-350. It had 265s on it when I got it, but when I went to Discount Tire, the only thing they would put on it was 235/85-16, because apparently, there is a law about putting only 8 or 10 ply tires on a 1 ton.

 

I have 37" tires and would not do it again. 3:73 gears

 

I sell tires...and mostly the thing you want to watch out for is speed changes and turning but if you have no problem turning with the tires you have now than you should be fine....the first number corresponds with the width of the tire in millimeters, the second number is the aspect ratio of the tread with in other words sidewall height but a 285/75 is going to be taller that a 265/75 get it but mostly in my understanding of the situation you should be ok

 

ohh yeah and the ltx is a great tire lasts really long but as far as mileage goes im not sure how it will change