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r-cman
03-17-2009, 07:54 PM
What is a good ring and pinion ratio to run with 40" tires? Any suggestions on where to buy from? Thanks!
8500lbs
03-17-2009, 09:23 PM
Search Button does wonders......

For 40's i would run 4.88 and you can get them from trailduty.com
OrangeCrush
03-18-2009, 12:59 AM
I agree.

When I ran 38's, I installed 4.56 gears. The whole point was to keep the same end gear ratio.

4.10's-33" = 4.56's-38"

So, I'd try 4.88's.... besides, you don't want anything lower, it doesn't make for good daily driving.

Mark
r-cman
03-18-2009, 04:58 AM
What gear ratio comes stock in the '05 H2 SUV?
tomp
03-18-2009, 05:39 AM
What gear ratio comes stock in the '05 H2 SUV?

4.10:1

They changed to 3.73:1 in 2008+
timgco
03-20-2009, 06:01 AM
4.10:1

They changed to 3.73:1 in 2008+

Why did they do this? Due to the 6speed trans or extra hp?

I wonder how 4.56's would be with 37's on that truck...or if it's even needed on that engine/trans setup.
tomp
03-20-2009, 06:11 PM
Why did they do this? Due to the 6speed trans or extra hp?

I wonder how 4.56's would be with 37's on that truck...or if it's even needed on that engine/trans setup.

Both reasons

If it were me, I would be putting in a front locker and swapping the gears for the 37s. I would at least use 4.10s and you should be able to find a good deal on them as several 03-07 H2s have changed out their gears and will have the 4.10s to sell cheap. I have a set you can have for $100 plus shipping.