I have a 2006 h3 which I believe is the luxury option, but not sure sure about the adventure pkg. I bought my h3 last month and unfortunately the dealer has had it more than me. They can't figure out the issue so I am hoping someone has an idea.
I will be driving and motor will Rev up like vehicle is in neutral, pull over and sit for couple minutes and will drive fine for a couple days. No rhyme or reason when it happens. Just want to fix my hummer! Help!

 

H3 has 138,000 miles on it. Dealer did a transmission flush and filter. Fluid was red and nothing in filter.

 

Who is "they" that can't figure it out? If it the people who sold it to you, and they say they changed the transmission fluid/filter just before you bought it. What would you like to bet it had a transmission issue when they got it and they tried the Hail Mary hoping fresh fluid and filter would get you far enough down the road that they would not hear from you. They do not want to foot the rebuild cost so they act stupid.

Take it to a transmission shop, when your vehicle stops moving and the engine revs, it is called a toasted transmission. A 4X4 GM truck with a 4L60E transmission will need a rebuild somewhere around 100-130K miles depending upon use, driving habits and maintenance, less if abused.

 

To answer your question "they" are 2 gmc dealerships and 2 independent mechanics. There is not a dedicated transmission shop within a 100 miles of where I live and given current situation may not be good idea to drive that far. The flush and filter was done after I purchased vehicle
Thanks for info about transmission. I have had 2 suburbans and 1 silverado all with 300,000 miles on them with original transmissions. One of the reasons I picked h3 because it has the same as they did. Guess I was just lucky before

 

 

I'm having similar problem. Did you find out to fix it?

 

Thinking your trans needs help...

 

yes we did find the issue. Got it fixed and haven't had a problem since. It was the clip in the transfer case that holds the drive shaft in.