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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

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Old 04-13-2016, 07:23 PM
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Default help with shopping list - coil conversion new shocks

Posted this on hummerforums a couple days ago and am getting no help! Hopefully one of you can comment for me.

My 2006 SUT was sagging for a week or so and wasn't going back up on its own so I'm going to go for the coil conversion and remove the air suspension. The truck has 118,000 miles on original suspension so I figured I would do shocks front and rear at the same time.

I'm also due for tires and have a set of 22" factory (MC2) wheels that I'm going to buy some 37" tires for. - Falken Wildpeak 37, 13.5 22 or toyo open country rt 37 12.5 22. Leaning towards Falken $365 per tire vs $450 for Toyo's, best price I could find.

With all of that I'm going to do a minor lift in the front by cranking the torsion keys, and I was wondering if I should get some sort of spacers for the new coil springs in back to raise it a little. I didn't know how to identify or search for those however.

So far my shopping list:
- rear shocks - Bilstein 24-185912 4600 Series Rear Shock
- front shocks - Bilstein 24-186735 Front Shock
- Coils - Arnott C-2138 Rear Coil Spring Conversion Kit for Hummer H2
- Coil Seats - Moog K160072 Coil Spring Seat (the Arnott docs say you don't need them but everyone here says you do?)

First of all - is there anything else I need while I'm doing this? Thoughts on the products I am buying? I'm not looking for a big lift - just enough to ensure adequate clearance of the 37's, and to level out the look of the truck.

The front shocks say they are for a 0-2.5" torsion key lift. I didn't find a rear shock on Bilstein's site that had the same spec so I went with original.

Anything other components that you would highly recommend I replace/upgrade while doing this?

AIR SUSPENSION STORY - my air suspension light has been on for two years but the system continued to work (dash button to extend height and inflator button in rear don't do anything). When I put the key in the ignition and turn to the accessory position, I usually hear 4 short bursts of what I am assuming is the compressor leveling up the back. Lately I'm still getting the 4 bursts, but after sitting for 10 days un-driven, the truck had settled down on the stops and wasn't coming back up on its own.. I managed to get the back end up again by having my wife sit in the drivers seat and turn the key on and off about 2 dozen times to get the bursts while I held a tire inflator from my garage compressor on the inflator valve in the rear. Three days later and the back end is still up in the air so now I'm wondering if I should do the coils or wait some more...

Thanks for any insights - I know this topic has been discussed ad nauseam on here but the key question I have is choosing the shocks and spacers!
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Old 04-14-2016, 03:02 PM
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guruerror guruerror is offline
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Default Re: help with shopping list - coil conversion new shocks

Here's a couple of things to think about:

Do your research on the backspacing on your rims. I know from experience with the stock 17" rims (5.5" backspace...if I recall) that moving up to a 37x12.5 caused a bit of rub on the front stabilizer shaft at full lock. Going to a 37x13.5 would be worse.

Regarding the torsion keys; I've found that cranking the torsion keys too much - like, if you're trying to 'level' the truck - will make your ride pretty harsh. Bumps will be much more pronounced and the steering will feel a bit squirrely; you probably should also have your alignment checked if you crank them way up.

IMO...and the best thing I've found is to go with the Cognito Leveling Kit. It gives you different upper control arms and other bits that will lift the front but also keep the ride in tact. It alters the geometry of the front suspension so that the truck will sit level but ride like stock. When I did my first H2 I got their complete kit which included Bilstein 5100 was perfect. Then you can use the torsion keys to make subtle adjustments (0.25-0.50") to get the height just right.

Regarding the coil spring swap, I'm pretty sure you need the seat (or spacer) check this link for more info:

Last edited by guruerror : 04-14-2016 at 03:04 PM.
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Old 05-10-2016, 06:08 PM
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Default Re: help with shopping list - coil conversion new shocks

Some of this may be helpful for you:
2005 H2 SUT
Moog Pitman & Idler
Cognito Support Kit
Cognito UCA's
Kryptonite Tie Rods
Kryptonite Swaybar End Links
Traxda Keys
Traxda Rear Coil Spacers
Bilstein Shocks
TruCool Tranny Cooler
Corvette Servo
Gobi Ranger Roof Rack
Gobi Bed Rack
Pioneer AVIC-Z110BT: Nav, Bluetooth, iPOD, Backup Camera
Valentine 1 w/ Blend Mount
ATX Artillery 17x9 Teflon
Toyo Open Country MT 37x13.5x17
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