No limited slip in h3,just 3 open differentials in 4 high so thats not an issue.
Old threads on this topic said 2 sizes was like driving in a circle. If thats right then with 6 ft spaced regular tires in a ?, 40 foot circle would be like a 33 in tire and a 40 in tire going straight. We dont drive in circles a lot but it doesnt hurt anything so thats not an issue.
The guy has issues not going to be solved here from what it looks like so why bother any furthur.
I think the supercharger was $10000.

 

No need for a system just a plasma cutter and a welder. Also I have the 3.7 but the Y pipe link to a one way and you can do the same.

 

if you believe that, then how bout you try it on yours???

I know a guy who put a used tire on his all wheel drive vehicle, and because it was a different size he ended up replacing a transfercase that cost him a nice chunk of change

 

1. You are not the only one who has 37s on an H3/H3T. I've seen it on I5s and now a few Alphas.
2. You need to regear to the 4:56s (f&R).That will get you back to the same basic ratio as a 4:10 geared H3/H3T on 35s.
3. As Doc mentioned, Superchips Flashpaq or Superchips Cortex (for multiple GM vehicles) will be your best bet for a pug and go tuner. You can swap back to the stock tune which is stored in the units memory at any time (ie: Dealer Service).
4. If you are getting 8-9mpg there is something wrong! I average 13.5mpg mixed between city and highway. Remember with the 37s you will need to add about 10-11% to your mileage when calculating. Even more if you don't have an OffRoad package equipped H3/H3T.
5. Around town (under 60mph) I stick with 3rd gear. I've done this with 3 Alphas with 315s and 1 with 37s and it makes a difference.
6. Exhaust: go to an exhaust shop that does muscle cars and hot rods. Tell them what you want and they will custom build anything your heart desires. Dual mufflers, single muffler, duals w/ resonators, etc.
7. I don't drive 70 mph so I can't comment on your constant search for the right gear. Highway 80 mph and no searching unless there is a decent incline. Then as with any vehicle with a newer 4 speed auto it either locks the torque converter or downshifts. (4:56s will make a difference here).

Hope this helps, or at least points you in the proper direction.

 

I'd say go with 35's (315s) - not that much difference in look or offroad ability, but I think it would make a big difference in on road performance. Since that's rejected, maybe go with 4.56 gears and a PCM tune.

For the exhaust, I know it's a bit nit-picky of me, but you do NOT want back pressure, you want scavenging. Install a quality, full length, legal exhaust. Something that will minimize back pressure and maximize scavenging.

 

While I agree that tires (esp size) is a personal choice there are reasons to bite the MPG bullet and go with the taller or wider tire (265 to 285 to 305 to 315 to 37" and beyond).

Sceptic, I'm not sure if you have seen any H3/H3Ts with 37s vs 315s but there is definitly a noticable diffenrence in the look to me. I have also wheeled with an H3T with 315s behind my H3T with 37s and YES there is also a difference in the "offroad ability" (breakover angle, approach angle, departure angle, front diff and rear axle clearence, underbelly clearence). There where areas where I went through unscathed he had to either be strapped or pick another line.

Can you guys tell which are the 37s and which are the 315s? Maybe I'm the only one who can notice. I am kind of a tire nut!