gguertin145

Meetthetwins

gguertin145

I pulled it with my last truck a 07 lariat with helper springs... it was at the max of what that truck could do though this one according to the ratings should do much better and has the max tow package.

I was thinking I would put air bags on this time but still looking around at that.

smokeywren

Not enough info to give you a good reply. We need the complete tiresize, sich as 275/70R18 vs.285/55R18.

The 285 vs. 275 is not important unless you get tire rubbing on the suspension. What is important is the tire revolutions per mile (revs/mile). The rear axle ratio will change in direct proportion to the percentage change in tire revs/mile. The error in your speedo, odo and trip meter will also change in direct proportion to the percentage change in tire revs/mile.

Example:
265/60R18 = 683 revs/mile
275/65R18 = 649 revs/mile

683 - 649 = 34, divided by 683 = 5%
Axle ratio 3.55 minus 5% = 3.37 = less power and torque to drag a trailer up a grade.
Speedo will be slow by 5%
Mileage recorded on the trip meter will be 5% less than actual = MPG calculations will show lower than actual MPG.
2000 engine RPM will show1900 at the same actual speed.

gguertin145

So I was just looking to give a little taller look. This will be brand new 2018 from last year that has 275/65r18 stock now and the 3.55 e-locker axle and the 3.5 motor. I was hoping to just get a tire slightly larger then stock and the 2.5" leveling kit but I dont want to do something that would significantly reduce my towing ability either... Trying to determine if the change would be minor or bigger in which case I just wont do it.

gguertin145

if I am reading your response right smokey the difference in just that tire size would basically bring the benefit of going with the 3.55 axle down to the same as the stock 3.31 axle? Is that right?

jp360cj

I'm possible to say without knowing what size tire you are going from and to. 275 and 285 are just tire widths.

gguertin145

well that is not what I meant then LOL... I am a computer guy sorry.

I want a taller tire do not care about width. if we said the stock tire was 32" how much would changing to the 33" equivalent affect it? On the stock 18" wheels? Is there a standard 33" size?

smokeywren

Given the tire sizes in my example, yes, it would change the effective axle ratio from 3.55 to 3.37, or very close to the stock size 3.31,

smokeywren

One size that is close is LT275/70R18. It has 33.2" overall diameter, with 627 revs/mile.
https://www.tirerack.com/tires/tires.jsp?tireMake=BFGoodrich&tireModel=All-Terrain+T%2FA+KO2&partnum=77R8KO2RWLV2&vehicleSear ch=false&fromCompare1=yes
Scroll down to click on specs, then over to overall diameter.

Choice of several brands in that size, including BFGoodrich, Bridgestone, Continental, Cooper, Dick Cepek, and General. However, those are all all-terrain tread, so study the tread design carefully before you decide on a brand. Apparently, all the tire companies got together and decided that folks who want those big meats for their truck also want off-road all-terrain tread.
https://www.tirerack.com/tires/TireSearchResults.jsp?zip-code=79782&width=275/&ratio=70&diameter=18&rearWidth=255/&rearRatio=40&rearDiameter=17