Hello
I am a proud owner of a 2005 hummer h2.
It was brought from UK and had genuine 13k kms on the odo.
I don't have any other vehicles around to compare it with as there must be hardly 5 hummer h2 s in all of India.
Currently I have tuned it with Diablo t1000
With 93 octane petrol and Borla exhaust.
It moves amazing and I had no complaints until...

Was driving on the highway at about 140 kms speed and when I slowed down my gear shifting stopped, I pressed the 4h and there were some loud cranking sounds in the transmission.
, now this happened every time I touch the car at high speeds the gear shifting would stop and I would press 4h and loud sounds from the transmission and it would start working just fine. But last night the same thing happened ( loud sounds from transmission after driving fast) the car is moving fine but there is no light in 4h or 4h lock or 4low lock it just blinks and stop. I am not driving fast now till I figure out what the issue is.

It's my everyday use vehicle and it seems to be working just fine but there is no light in the 4h anymore, which is suppose is on all the time. ?

 

Do any codes come up when you hook up your OBD ?

Taking a wild guess here but it could have something to do with your transfer case shift motor. Mine started to act up when it didn't let me switch from 4Hi to 4Hi Lock or 4Lo. It would just blink in the chosen position and go back after a few seconds to 4Hi.

 

I would buy an OEM 4x4 dash switch and the transfer case motor. Both are trouble prone and both are fairly cheap and easy to install.

 

no codes are coming up - i have ordered the transfer case motor its not expensive ,
what worries me is the loud sound which use to come after i drove the car at high speeds stopped and the gears stopped shifting , i pressed 4hi and bang bang bang -- sounded like the transmission blew up .

and now i dont have 4hi light anymore and it just blinks when i click on it

the h2 is moving fine though and the gear is shifting allright , how come ?

 

what worries me is the loud sound which use to come after i drove the car at high speeds stopped and the gears stopped shifting , i pressed 4hi and bang bang bang -- sounded like the transmission blew up .

and now i dont have 4hi light anymore and it just blinks when i click on it

the h2 is moving fine though and the gear is shifting allright , how come ?

 

Any fluid leaking out of the transfer case?