Hey guys just got a superchip1715 micro max tuner and would like to know what you guys recommend for the settings such as Gear size, shift points, shift firmness, and i have tires size 315/75/r16 what does that come out to in tire heigh??? Any help is much appreciated

 

I tried some transmission changes and went back to stock. For the tires, you can either go to Tire Rack and read the specs for that size or just measure the height with a tape measure which is what I did. I really like what the superchips did for my 02. I checked the speedometer against my garmin gps and they agreed.

If you don't know what gear ratio the rear diff is, look on the tag on the diff cover or look at the code on the door jam sticker.

 

how do you change your gear ratios? i want to change mine to 4:10 i was told these are better than the current gears i have.

 

To physically change the ratio, you have to buy new gears and have them installed. Figure about $800 per axle.

 

OK thanks I was confused with that issue, i was told by a friend that the tuner will be able to do that but i did not believe that was the correct way to go about it, thanks for the help

 

No, the programmer is used to correct the computer for different ratios and tire sizes so the speedometer/odometer is accurate. The computer is programmed for the ratio and tire size it left the factory with. This also affects transmission shifting as it uses the speed input as part of its programming. Think about it - how can a programmer physically change a gear ratio?

Bottom line, when programming use the actual gear ratio you have, and experiment with tire sizes till the speedometer is about 1 or 2 mph higher than a GPS at around 60 mph. If you use a smartphone with an internal GPS you may need an app to read out speed.

 

Before I got a gps, I timed my vehicle between the mile markers on the interstate for many consecutive markers and computed my speed and compared that to the speedometer reading. Of course you need to have the cruise set and drive on flat land for it to be very accurate.

 

But which gears are the best for an 2001 f150 5.4 used as a daily driver and just want a faster start from the line.

 

i have tires size 315/75/r16

 

2wd or 4wd, and what is your current ratio? Easiest place to find it is on the door jamb sticker, under AXLE. It will be 2 characters, post them.

 

First Gear Ratio (:1)2.84 (2.84 min/2.84max)Second Gear Ratio (:1)1.55 (1.55 min/1.55max)Third Gear Ratio (:1)1.00 (1.0 min/1.0max)Fourth Gear Ratio (:1)0.70 (0.7 min/0.7max)Reverse Ratio (:1)2.33 (2.33 min/2.33max)Transfer Case ModelWarner 44-06 Transfer Case Gear Ratio (:1), High1.00 (1.0 min/1.0max)Transfer Case Gear Ratio (:1), Low2.64 (2.64 min/2.64max) and it is a 4x4

 

Axle is h9

 

Axle h9 and the truck is 4x4

 

Axle Ratio (:1) - Front3.55 (3.55 min/3.55max)Axle Ratio (:1) - Rear3.55 (3.55 min/3.55max)

THAT IS MY AXLE RATIO

 

Okay - H9 is a 3.55 limited slip. Stock tires are 30", yours are 34.5".

4.10's will put it back to the equivalent of stock, but the bigger tires are also heavier and have more rotating mass and wind resistance, so 4.10's won't get you back to stock performance.

So, you need the next step up, which is 4.56, to give you more punch off the line. Your city gas mileage may improve, but highway mileage probably won't.

With a 4x4, you are looking at $1500+ to do both axles. If you only do the rear, you can't use 4 wheel drive and you should pull the front driveshaft to avoid problems.