Like he said ...:agree2:Cummins motor has plenty of torque to push the 37's. If you pulled a lot then maybe regear. You'd notice more of a difference regearing then running 35's in my opinion.
Trowel, I would think you would have to at least go with a level kit with 35's...:thumbsup:Slight de-rail here. Can you put 35's on factory 17" rims without lifting or leveling and not have rubbing issues? Or do you have to at least do a level? In my searches the largest I've seen somebody go without a level is a 33" on factory rims.
What size lift do you have for them 37's.Here's the chart I made. It'll save you a little time. I have the 68rfe and was comparing gears for 37" tires. Pretty self explanatory. Another thing to consider is fuel mileage. My evic mpg thing went from 20 mpg now I might see 14.4 at the highest. I know it's not completely accurate but it's a good estimate. Also my speedometer isn't corrected so it's off by 12.8%. Keeps some miles off the truck til I get new gears. Bigger tires are heavy so consider that too.
Mine is flat road with cruise control at 60 the whole way.5" lift. Most of my driving is highway with speedlimits of 55 and 65 and some hills. 60mph is to low and I usually end up staying in 5th unless it's flat road or down hill.
Can you explain lockers for me as it relates to differentials. I've always heard people doing this upgrade but don't know exactly what this does over stock differential and what the pros/cons are.Just to get a feel for it try it out at 54mph that's about the rpm you'll be running. If it's flat though you should be fine. Doesn't feel like I lost much acceleration off the line. Once the turbo is making boost you can't really tell you have bigger tires. Another reason why I'm regearing is I was gonna do electronic lockers but decided on a set of Eaton Detroit lockers. I don't want this truck to get stuck my old tacoma had an electronic locker and it was nice and never got stuck in mud snow or sand.
Basicly makes a true 4x4. All 4 wheels pull. Electric/air gives ability to disengage them. Full time lockers can be dangerous on wet slippery roadsCan you explain lockers for me as it relates to differentials. I've always heard people doing this upgrade but don't know exactly what this does over stock differential and what the pros/cons are.