Re: 2006 T1N 3500 16" wheel conversion - tire size + what do I have to reset and how?
Pretty sure you need a factory level scanner to do it, but it should be quick and easy. The largest tire size available is 225/75R16.
I have the new Autel and it works very nice and is said to be very complete. Still learning how to use it... but I don't recall seeing a wheel size setting in the menus.
By stock tire, do you mean stock rim? Is it a direct, bolt-on match?
I mean the tire. I assume you are using the ncv3 wheels.
I put a link to what I bought in my original post. These wheels have the tapered holes to fit the old lug nuts. Apparently these 16" wheels were used a lot in RV applications.
If you *don't* tell the electronics about it, pretty much the only effect will be that your speedometer gets a little more accurate
(for most people it reads 3 to 5% fast, enlarging the tires brings that back to "accurate")
The odometer will get less accurate (it won't report the true mileage ... it'll under-count)
The shift points may be a tad late (for power).
If you have the higher ratio differential (4.11 vs 3.73?) then the larger diameter would (again) bring you back towards what the standard 3.73 provides.
--dick
This is the info I am looking for. I have the 4.11 rear diff, and my speedo is about 5% optimistic.
When you say that the shift points may be a tad late, do you mean that the engine will rev higher before the transmission shifts?
I drive my truck pretty easy and use a slight lift on the accelerator to initiate a shift.
You could save yourslf some trouble and put on 235/75's on your 15 " wheels.
I did and it zero'd out my speedo but made my odometer 10% inaccurate(optimistic).
The increase in size is substantial.
If you drop the PSI front and rear into the 40's I think the ride will surprise you.
Your van will ride like a Cadillac.
...
With a GDE tune the slightly altered shift points are a non starter since you have what we always called 'lift'.
Well, too late now!
I like the look of the larger wheels and fwiw, my 15" wheels are rusty. I've painted them with a "band-aid" treatment, but new ones will look nicer.
Regarding air pressure, I have tried this and settled on a 50-ish pound pressure. The truck does ride exceptionally smooth, but you can feel pavement imperfections.
