2007HummerH2
Well-Known Member
- Messages
- 317
- Location
- Maine
I have been having an issue with a clunk in my 3 for a while now. Got rid of most of the clunks/clanks up front by tightening the front skids and ucp. BUT, that dreaded clunk still was very loud almost every time I turned left. Finally got together with Larry (my fiance), and we properly diagnosed what is causing it. It's in the rear axle. This is what we found:
1) Driving over a drain/manhole that dips down and then back up, body flexes, and you can hear the rear end clunk loudly
2) Vehicle in park, in garage, turned off. If you go to the front bumper, and push the H3 up and down, on passenger/drivers side, you hear a clunk from the rear wheel. The clunk is louder on the rear passenger's side. You can physically feel it.
3) We took the rear tires off. There is definitely play in the end of the axles. You can move them up and down with your hands.
4) There is no visible sign of a leak on either side.
5) The clunk seems to go away when driven in the rain/wet roads-I know, it makes no sense at all!
6) There is no moan or whine driving....it drives perfect and is quite
We have not opened the inspection hole, to see what amount of fluid is in the rear diff. I'm waiting for it to cool down. We are thinking that it possibly could be bad bearings.
We would like to know a few things:
1) Does anyone have a blow out diagram of the rear axle with a rear locker?
2) Is this a common problem or has anyone experienced this before?
3) Are there any recalls/TSBs on this issue?
4) What would cause the end play that I have?
5) I would like to confirm the correct GM part # for the rear diff fluid for a rear locker. Dealer says it's all the same, no matter which H3 you have.
I do know that the previous owners towed a boat, but I'm unsure of the size of the boat. I'm not sure if that caused the damage.
Any information would be a great help! If it is something simple, and not expensive, I would like to repair it myself. Otherwise I will have to drive approx 4.5 hours to the closet dealership that may know what they are doing.
It is parked and I will drive my H2 in the meantime, until a complete diagnoses has been done.
1) Driving over a drain/manhole that dips down and then back up, body flexes, and you can hear the rear end clunk loudly
2) Vehicle in park, in garage, turned off. If you go to the front bumper, and push the H3 up and down, on passenger/drivers side, you hear a clunk from the rear wheel. The clunk is louder on the rear passenger's side. You can physically feel it.
3) We took the rear tires off. There is definitely play in the end of the axles. You can move them up and down with your hands.
4) There is no visible sign of a leak on either side.
5) The clunk seems to go away when driven in the rain/wet roads-I know, it makes no sense at all!
6) There is no moan or whine driving....it drives perfect and is quite
We have not opened the inspection hole, to see what amount of fluid is in the rear diff. I'm waiting for it to cool down. We are thinking that it possibly could be bad bearings.
We would like to know a few things:
1) Does anyone have a blow out diagram of the rear axle with a rear locker?
2) Is this a common problem or has anyone experienced this before?
3) Are there any recalls/TSBs on this issue?
4) What would cause the end play that I have?
5) I would like to confirm the correct GM part # for the rear diff fluid for a rear locker. Dealer says it's all the same, no matter which H3 you have.
I do know that the previous owners towed a boat, but I'm unsure of the size of the boat. I'm not sure if that caused the damage.
Any information would be a great help! If it is something simple, and not expensive, I would like to repair it myself. Otherwise I will have to drive approx 4.5 hours to the closet dealership that may know what they are doing.
It is parked and I will drive my H2 in the meantime, until a complete diagnoses has been done.
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