Does anyone know what height and width tires I can run on a stock 98 dodge 4x4 3500 drw? With out killing my mpg.

 

almost any bigger tire will hurt yer milage

 

What gears? My ol 2000 Cummins I had, had a set of 4:10's in it and goin up to a 33 didn't help much but it didn't hurt it either. It lowered the axle ratio to like a 3:73ish which was nicer on the hwy.

And on my dads 99 drw he put on a set of 245/85r16's. Nice size tire roughly 32.5" tall with good spacing between the duals....

 

It has 350 gears in it.

 

Sure its not 3:55's? Dads truck had that gear set and with the manual you couldn't tell the difference from stock to the new size...

 

I believe most duallys run a 4:10/4:11 gear.

Im pretty sure its not a 3:50 - never heard of that ratio for these trucks.

 

The sticker under the hood says axle 3.5. at about 2,000 rpm its doing 70/72 mph.

 

Yup dads 99 had 3:55's they came both ways......

 

my 98.5 had 3.5s If you dont want them to rub when its loaded the biggest you can go is 235/85/16.

Any larger tires is going to bring your mpg down.

 

235/85/16 that's what it has on it now...so that's what i'll put back on tomorrow.

thanks guys.