3.73 to 4.10s.. Tuning PCM to account for it 2003 TB ltz

[lukeclement]

Hey guys, have a 2003 Trailblazer LTZ, it's got the 3.73s with the G80. I am looking at some axles out of a different truck that also have the G80, but with 4.10 ratios. This is good for me, because i'll be running basically 32.5"s here pretty quick. I currently have 31.6"s, and when I hooked up my HPtuners to my truck to change tire size (it has a field for that in my buddies 05 avalanche, so I assumed it would work on my TB), there was no field for that.

So, my question is, what kind of weird tuning will I have to do so that my shift points and all that crap don't get too screwed up? Can I even do this on my year truck? I remember reading that the 02 and 03 years are different from the others. Thanks for any and all info regarding the diff swap.
Luke

[PROSPHOTO]

Years ago, the HP tuner was very limited when it came to these trucks; don't know if that changed. The EBTCM has the ability to alter the tire size, but only up to 30" tires (if I remember correctly). PCMforless (PCM of NC) maybe able to get the computer close (gears),you'd have to contact them you find out.
I downloaded a GPS Speedo app on my phone, and thats what I use as my speedometer since the truck speedometer is off 5-6mph at highway speeds (3.73's w/32" tires)