My 08 Alpha squeeks when going over subsantial bumps in the road. Mainly just hitting a pot hole or a lip in the road. Any ideas?

 

Where at? Front? Rear? Suspension? spare/gate?

The leafsprings are notorious for squeaking. Hitting them with a high pressure wash to clean all the crud out from between the leafs will often substantially reduce or eliminate the squeaking.

 

Mine was doing something similar and it turned out to be body mounts. Still under warranty, so it was taken care of.

 

It's seems like its in the rear. I'll give the leaf springs a good washing and see if that helps.

 

I had a severe case of the creaks whenever I turned left or right or went over bumps.
At first I went over 4 to 6 joints in the front end with WD-40. There was little improvement so I considered taking it to the dealer. The next day I decided to go over everything and I mean everything. I got on my back under the H3 and discovered joints I had missed under the front end.
Upon standing and looking down between the tires and wheel wells I sprayed the shock joints bottom and upward toward the tops even though i could not visibly see the joints. I found other joints in the area too. Next I took care of the rear shocks (even up into all of the shock covers) and even the leaf supports and any and all else. I am here to say all creaks and squeeks are GONE and I am glad I did not give up after the first try.

 

https://www.hummerforums.com/forum/n...bumping-23220/

 

LMFAO I'm dead. Too funny...
But for real, not everyone is tech savvy, or forum savvy for that matter. Maybe he didn't notice the date posted or was excited to post his results