Got a question for Wandell and the other guys runnin 33" tires. Were you able to program the revs for speedo cal in the pcm,gem,abs? Or are you guys doing it with a chip??? I just put a set of 265/70/16's on the parts managers truck, and was not able to set the rpm in the pcm, gave me some crap about "refer to as built sheet" So before i go and put my 33's on, if i need to get a tru-speed calibrator or something...

 

I'm not running 33's but I did buy 1" taller tires. I already had the Superchips Max Micro tuner so all I did was reprogram the computer again with the measurement of the taller tire. Works perfectly all the way to 90 per my GPS (couldn't go any faster because I ran out of straight road).

The micro tuner wasn't cheap, but well worth it since I needed just a little more power out of my truck.

--Justin

 

i am running 33's now, stock was 30" so i'm about 10% off. in town, you won't notice, but on the highway the faster you go the more noticiable it will be.
has a slight effect on your shift points in the antotranny.
i have a GPS too so I used that for about a month until i decided to get the Supertuner. i got the 3 program one so you can adjust it for tires, and still run 87 octane if you choose, adjust shift points etc. i picked mine up on ebay, used, cheaper than new. i have seen a couple other prodcuts out now that will adjust for tiresize and are about $100.
if it doesn't bother ya - leave it.
if it's a slight bother - get an adjuster
if you plan up upgrading or need the flexability, spend another $100 and get a tuner.

http://www.4wheelerssupply.com/catal...te_banner_id=1

- but i've seen them for less