I tried the search option, but nothing much is showing for H3.
( Maybe my cell phone browser sux).

Any thoughts on this? The Billet or Vette servo swap? I have 2007 H3 Adventurer - auto. I see lots of info on the 355 sites, but not much here on the Hummer side. Is there a disadvantage for H3 vs Colorado, Denali?

As always thanks for your time.

 

MOVED, this ain't no FAQ.

What prat tell is the "servo" you are talking about.

 

Trans for firmer shift 1-2, can also go firmer 3-4 from what is being said about it . Better towing ability, cheap easy swap. ( If you believe everything you read on the internet ) .
​​​​​seems to be something popular on the 355 sites, but not much about with the H3's.

Just curious if anybody has done it and if it really makes a difference ? 06-10' H3 are listed as compatable by one vendor who sells it for about $20.

 

Go with Corvette and switch out the plastic 1-2 accumulator piston for a metallic one at the same time (good chance the plastic one will break after the servo swap).

 

Thank you. Other one looks to be better built, but the Vette option seems to be the consensus . Thanks man appreciate it.

 

Thought that was what you were talking about, just making sure.

I think you would be better off by getting a PCM Tune, you can select exactly how you want the shifts to be, where the kick down is etc, and a bunch more. If you are planning on getting a tune, forget the servo.

2006-07 Transmissions are controlled by the PCM.
2008+ have a separate Transmission Control Module. When you mail order a tune for them, you also send in the TCM with the PCM.

Then you can tune total performance, not just shift points.

You can also go with a Hypertech for 3.7Ls, or Superchips for V8s, type tuner and change Trans settings on the fly (2008+ trucks).

 

SuperChips will NOT work with the LH9 in 2010 Alphas. 08-09 Alphas only.

I have read and heard good things about exactly what Ordieh has said on the corvette servos and metal accumulator for 1-2. The 4L60e should already have metal accumulator for the 3-4.
CBphoto had this done during the rebuild of his trans and it shifts crisp, not sluggish (OEM) or violent (shift kit).
The addition of a trans pan with a drain bung welded in too. These will be upcoming upgrades once my warranty expires in May 2018!