So I will be going with 22's in all 4 corners. 22x9 front and 22x11 rear with 275/40 & 305/40. I am also putting my Yukon Positrac in the rear end and thought about adding 3:90 gears to it.
The factory rear end is limited slip with 3:42 gears.
Can you think of any issues with that? Will I have to have a "Rear End Tune" after the install?

Chad

 

I don't see a problem with that.

3.90's is better than 3.42's in many applications and yes you need to tune the computer for the gear change. The speedo needs to be corrected and the transmission needs to know the tire size and gear ratio for proper shift scheduling.

 

4.10 or bust

 

agreed

 

I agree 4.10's with the 31.6" diameter rear tires.

Yeah just add the tire height and gear ratio in the HP Tuners "Gear/Tire Wizard" and it scales all the parameters in the tune automatically

 

I figured the Speedo would be off but is ok to drive around for another couple of months before I get that "Tune"? I don't have HP Tuners, or any tuning software for that matter. I will be installing the gears in the next week or so but the tires & wheels won't be installed for another 4 - 6 months as CASH permits it.
With the new gears installed is the computer going to flip out because of the gear change and make it unsafe to drive? You mentioned 'Shift Scheduling', will it damage the transmission not having it tuned for a month or so?

Chad

 

I did 4.10 in my 2012 with stocker 20s, it raised the rpms over all by about 500...gas mileage didnt change one bit even down the highway, plus its quicker around town. if you change the gears and wait on the tune, your ABS light and dinger will hate you every time you start the truck and get rolling. Your ABS and Stabilatrak and Traction control will NOT work, when the lights are on the system will not work properly. If you want to pay for the credits, I can make the adjustment to your tune. I wont do any actual engine or trans tuning just the gear ratio.

 

How much are credits? What are Credits? I'm assuming you would plug into my truck to do this, so where are you at? I live in Keller, about 8 miles South of the Texas Motor Spdwy.
Thanks for the reply!!

Chad

 

I'll have to check on the price of the credits for the HPTuner License to make changes to your truck. yeah I'll have to plug in to the truck and mess with it, I'm in the Weatherford area. We met once before, I bought that rear sway bar off you a few years ago.

 

Oh yeah! How did the sway bar work out? Great I hope!
Yes, let me know about the HP Tuner thing and I will holler at you when I got the gears installed.

Chad