I'd recommend to get thy self under the H3 and take a look at some of the stuff.
Could be front or rear drive shafts, cv axles, trans/tranx mounts.. on and on.

 

CAT Heat Shield and/or exhaust manifold heat shield.

 

 

Probably not the best vehicle to own if you don"t know what you are looking at....unless you have a lot of $$$ then I would say enjoy your H3! Good luck.

 

Knowledge is power. Never too late to learn.... or just bumble along dumb as chit if you like.

 

 

 

= kidding = funny. Guess you did not like my bad sarcastic joke?
Sorry bout that.


My thought is kinda like, if you have no idea what to look for or how to fix anything automotive and you are just going to a repair facility and hand them cash to fix it.... why ask what might be wrong?

When you drive an old vehicle (h3s are now 8-12 years old), be prepared for stuff to need fixin. When you add to that the limited production factor, be prepared to hand out the cabbage when you do get it fixed.

Anyways, best of luck. Enjoy your 3.

 

Not anyone sir but specifically only to someone that asks such a vague question. Hummers are not just "a car". The H3 is AWD with available 4WD. Not only is there a transmission under there but also a transfer case with 2 prop shafts; a lot going on compared to " a car ". We went easy on you. Go to some mechanics and state your problem verbatim and they might laugh at you and at the same time be thinking about how much $$ they will take from you which leads to what Doc says about knowledge being power. It also protects you from greedy mechanics.
You might try to describe if the noise is coming from the front or back of the H3. If it vibrates, do you feel it in the back of your seat or in the steering wheel? Does it do it right after start-up or after it has warmed up? Kinda like going to your doctor and telling him/her, "I don't feel good".
Don't be so uptight, relax.
Let the search feature be your friend on here.