Rear locker

[Desert Dan]

If you add a rear locker you are probably going to want 33" tires.

With 33" tires you would want or wish you had 4.56:1 axle ratios like the Adventure Package

So think about the cost of:

New ring and pinion gears front and rear

Rear Locker and all switches and wiring etc

MO Money

[Wisha Haddan H3]

Originally Posted by Desert Dan

With 33" tires you would want or wish you had 4.56:1 axle ratios like the Adventure Package

I thought the base H3 already came with 4.56 axles

[Wisha Haddan H3]

according to this site, 4.56 axles are standard. Good thing too, cause that's an expensive upgrade.

http://www.dealernet.com/Vehicle.aspx?trim=17189&vehiclename=Hummer+H3+4WD% 204-Dr

And a vast majority of H3 owners really don't really need the rear locker. Wait until you need to buy another rig, that would be the economical solution. All H3's (base/lux/adventure) have 4:56 rear ends according to the research done on this forum. Adventure package does have the lower crawl ratio.

S.

[Desert Dan]

I will have to check the brochure for the 2006 H3.
I could be wrong

Why would they put in 4.56:1 axles with the 32" tires if they want to be able to get 20MPG

Brochure shows different rear end ratio for manual trannys only. But research seems to indicate 4:56 rear end on all H3's. Fancy brochures by GM Marketing types with all kinds of CYA disclaimers are suspect.

S.

[f5fstop]

At minimum you will need:
Electric locking diff case
Lockign diff side gear
Lock pin
Locking diff clutch spring
Locking diff ball bearing plate in board and outboard plates
Locking diff ball bearing assembly
Locking diff coil plate
Locking diff coil assembly
Diff carrier locking pins (eight or ten)
There is more too, and then there is the wiring, switch, new TCCM and of course a reprogram of the BCM/PCM, and maybe, just maybe (I'm not sure) you might even need a new BCM or PCM.