Home Forums Gear Hunting Trucks and Four-Wheel Drives Going from 33" to 35" tires ?

Or just reprogram the computer so you can use the speedometer as intended. Keeps the odometer accurate too.

Personally with 35s I would be looking at new gears, probably 4.10 at minimum, which is where I think gearing should actually start in all trucks and a reprogram. Just what I have come to prefer if going with larger tires.

If more than a 5 speed auto I wouldn't have an issue with 4.33 or lower as long as you aren't going to be at too high of RPM at say 80sh MPH.

35s drop fuel mileage but you have enough truck to be fine on the power side

I'm not following this. FORScan does not install 'on' the vehicle. It installs on to your computer, then you use an OBDII adapter to connect it to the OBDII port in the vehicle. You select the module you want to modify, then make the changes and save them. Then you unplug the adapter. I've used it to activate a factory brake controller and turn off the door/ignition chimes, and a few other changes. Pretty easy to use once you get the hang of it.

Hahahahahahaha!! :-)

Set the hook!!!

I have 35s on my 3500 and will go back to 33s when i need new tires. I want the extra bed rail clearance when pulling the 5r and i am hoping that the MPG will increase both loaded and empty. I am fairly easy on the skinny pedal and get 18-19 on the hiway. I would like to be 20ish like my old 12 vlv. Most all aftermarket tranny builders will not warranty a build if the tire size is over 35".

Most all aftermarket tranny builders will not warranty a build if the tire size is over 35".

With at least one manufacturer putting 37s on a vehicle, (Ford Raptor) do you feel this will continue. For the record I have no plans to go to 37s.

I have no idea about gas rigs, a Ford Raptor interests me not at all, mainly because it is a Ford. One of the main reasons for the disclaimer is the way the D2 engine builds torque. If engine RPM drives the trans pump there is only so much builders can do to increase trans line pressure at low RPMs where a D2 engine makes the most torque. If peak torque comes in at say 1600 RPM and peaks at 2400 RPM that is not alot of fluid movement in comparison to a gasser that has max torque at 4000 RPM. So much easier to let the smoke out of trans parts behind a D2 engine...have done it several times. Little tweak for more power kills the factory trans, buy an aftermarket and think i will never be over the HP rating of this trans. Another little tweak such as a programmer, turbo or injectors because (you think) the trans can hold it, right? Wrong. It can and will for a while then it lets go and you are shopping again. Soon you have spent 22K on 3 different transmissions to get a trans rated at 850 HP that you should have bought the first time. I think if you were to swap gears with the taller tires you will do yourself a favor. if you have 3.42s going to 4.10s or 4.30s would be ideal.

Sorry SP. I was just being a dick.

I take back everything I said. I think that people ofall religions should use this application. Forscan isn't just for Gentiles anymore.

OP, sorry for sidetracking your thread with dick jokes, but a cheap laugh is.... still a laugh.

The equivalent Ram app to the unfortunately named Forscan is Alpha OBD. You'll need an obd2 interface. I got the obdlink mx+, but there are many. That one can Bluetooth your phone to your truck and let you check codes and adjust settings.

There are probably more than a few apps that can perform this task, and AlphaODB is probably the most expensive at $49. But I'm betting there are a few options that you will want to change that will be easy to do with it. For example, keeping the fog lights on with high beams and turning off that stupid seatbelt chime. (you can do that without an app, but just an example of one of the settings that you can mess with)

2014 Cummins with 35s and leveling kit. Speedo is still on. Go for it.