I own an 05 H2 which I bought new. Other than the water pump going out, I've never had a problem. I change the oil religiously. But now I'm at 84,000 miles and don't want it to break down on me. So to you Hummer experts, what should I have my local mechanic replace? Plugs, wires, radiator flush, trans flush, etc.? Thanks

 

Don't do a trans flush, all you do when you do that is loosen the metal up thats in the pan and send it through the whole system. Better to just drop the pan and clean out the pan.

 

SORRY I'm in a bad mood & you're not first one to get this tonight but here goes there is an H2 section
https://www.hummerforums.com/forum/hummer-h2-8/

 

You didn't sound like you were in a bad mood. Actually I was going to post it over there since it sees more traffic!

 

Doesn't matter H1,H2,H3 they all need maintenance. Some just need alot more than others because how they are treated.