rebelman06

For those of you who stumble across this topic looking for RAP on the GMT800 trucks (formerly "nbs"), I make a similiar write up here: GMT-800 RAP How-To (99-2007 Classic)

I think the "nbs" part of the title should be renamed to GMT900 or 07-11 to avoid confusion with the 800 trucks that were once the "new body" style. I have figured out the connector part # and pinout of the 800 trucks and plan to make a write-up like this one. I almost ordered the wrong part number for my truck because the post doesnt list the years, only the vague "nbs."

The updated TSB says not to slot the holes and says to remove the undercoating around the holes and installing 8 big washers. I tried to recommend this fix ealier. It cost me about $16 and 45 minutes to do myself. My truck sounded like a POS in parking lots before I fixed this.

Did your shop do the washer TSB or the body mount TSB? The body mount could occur on a 4wd, but the crossmember/washer situation would not because the 4wd crossmember setup is different IIRC.

I noticed your profile said a 2007 Classic. If it is a 2WD, I may have a solution for you. My truck was popping on slow turns, speedbumps, parking garage ramps, dirt roads, ect. I had my ball joints checked and my tie rods replaced, but my 2006 still did it (before and after my RC lift). I fixed the noise I was hearing by removing the crossmember, scraping some undercoating away from the bolt holes, and adding the washers specified in the TSB listed below. The P/N is 11509592 (8 required) and is available through GMPartsDirect, GMPartsGiant, and your local dealer. It took me about 30/45 minutes with a break or two for some water. There is also another TSB that involves adding nylon spacers to the body mounts. I also bought those because the spacers and washers are pretty cheap, but I did not need them after the crossmember work. The only tools needed was a ratchet, breaker bar, small extension, a couple of metric sockets, and your choice of ramps or jacks.