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Thread: '06 GMC K2500 Buildup

  1. #1
    Join Date
    May 2011
    Location
    Farmington, NM
    Posts
    367

    Default '06 GMC K2500 Buildup

    Well, I like reading build threads as much as the next guy, so I'm gonna start one of my own, both for your enjoyment (amusement?) and to serve as motivation for me to do a nice job with my mods!

    So I recently bought an older Hallmark Ute 8.5 for my truck, in hopes that it would serve as a good way to show my parents around Colorado for a week this summer, and then I'll let them take it for a week or so on their own hopefully! Camper mods will show in a different thread...

    My truck is an '06 GMC CC-SB Dmax Allison. Mods will be general suspension enhancements, comfort items, and a little preparedness equipment. No big lifts, power tunes, or crazy stuff for me, KISS!

    Current state:
    Torsion bars tweaked just a little
    285 BFG A/T's on H2 wheels
    Just added Air Lift bags to get the rear up off the overloads. Hoping for a better ride.

    Upcoming projects:
    Better in bed forward tie-downs for camper
    Front receiver hitch (for a motorcycle carrier)
    Front winch bumper (I have an 8274 that was on my ol' '96.)
    Possible 1" rear blocks and a little more bar tweaking...
    Make new Trans X-member that doesn't hang down. (Mine came pre-mashed...)
    Good T-case skid ??
    Fix rear G80 or put in an AAM Torsen diff.

    Here's a pic of the rig for posterity...



    Stay Tuned!!
    Chris

  2. #2
    Join Date
    May 2009
    Location
    Katy, TX
    Posts
    935
    Looks like a good starting place. Is that a fleet truck?

  3. #3
    Join Date
    May 2011
    Location
    Farmington, NM
    Posts
    367
    It's a "Work Truck - LS" GMC, which means no outside trim, rubber floor, but cloth seats, power windows, locks & mirrors, cruise, and some other features. Had gray steel wheels with literally shredded tires when I got it. It belonged to a grain company in N. Dakota I think. The underside is all gravel blasted, and the skidplates and trans crossmember are a little beat up too. The white hides dents and scratches, which it has a few of...
    This is my second GMC with a rubber floor, and I will never go back to carpet in a truck! It's also the first automatic I've owned, but I knew from my last job that the Allison and I get along just fine.
    Chris

  4. #4
    Join Date
    May 2011
    Location
    Farmington, NM
    Posts
    367

    Default Air Bag Installation

    This is a little after the fact, as I did the install last weekend, but I thought I'd put a quick summary out for the Air Lift airbags that I installed.

    My truck didn't have an easy life before I got it, so the rear springs are very close to the overloads even with the truck empty. This means the truck doesn't squat much with you weight it down, but the ride isn't so good, since the overloads are always kicking, even with it's empty.

    I decided to put air bags on to get a little height back, as well as to get the spring pack up off the overload leaf and hopefully improve the ride some.

    Picked up a kit from Air Lift, as they're made in Michigan, where I'm from, and the price was a little better than the Firestone kit. (I had Firestones on my '96 and they worked well too. The kit for my '06 looks almost identical to the A-L kit I bought.)

    Installation was just plain EZ. Unbolt and remove the factory jounce bumper, bolt together the bags and brackets per the instructions, leaving the top bracket loose. Jack up the back of the truck a little to get some working room, and put the bags with brackets in place. Two bolts top and bottom, and a little wiggling to get them set evenly away from the springs, vertical, plumb, etc, and then tighten the bolts down. I replaced the license plate screws with the air line fittings as is commonly done, plugged the lines into the fittings on the bags, added a few zip-ties and a heat shield on the tailpipe and I was done. I'd say it took me about 2 hours total from start to finish.

    30psi is enough to pick the truck up off the overloads a little higher than it sits empty. I haven't had a chance to drive it yet, but based on experience with my last truck, it'll be nice.

    I'll shoot a few pics tomorrow and post them.
    Chris.

  5. #5
    Join Date
    Jan 2006
    Location
    Reno, NV
    Posts
    1,088
    Looking good. The 'Max/Alli combo is pretty amazing, even offroad.

    Jack
    2007 2500hd, Max/Alli, Hawk FWC (the new explorer)
    Build thread: http://www.expeditionportal.com/foru...07-Chevy-Build
    2006 Jeep LJ Rubicon
    Build thread: http://www.expeditionportal.com/foru...006-LJ-Rubicon
    KE7NCK

  6. #6
    Join Date
    Oct 2010
    Location
    Palomar Mountain, CA
    Posts
    123

    Default 06 GMC Buildup

    Chris:

    I added a leveling kit along with a tweak in the torsion bars on my 2006 Chevy 2500 4X4 single cab Duramax/Allison. Got 3 additional inches on the front. Also got a one inch block in back with Firestone airbags. I haul an older Apache popup camper in the bed and it works great. Running 285 75 16 Toyo M-55 tires. Added the Bilstein 5150 shocks, too. No tire rub at all, even running some rough stuff in the desert. Rides rougher without the camper, tho. Mine's an LS trim level, too. Has a real, honest to goodness shift lever for the transfer case on the floor. Looks like you've got a great start for the rig. I'm subscribing and will be watching your progress.

    Cliff

  7. #7
    Join Date
    May 2011
    Location
    Farmington, NM
    Posts
    367
    Ok, a little more work done over the last few days... First, I wired up and in-bed RV connector so I can plug my camper in, and so my gooseneck wiring isn't hanging over the tailgate anymore. Kudos to GM on this one... On the HD trucks with a tow package, the wiring is already run to the front of the box, wrapped up and zip-tied in place!! All I had to do was drill a hole, feed the wires up through, and put a connector on. Took all of about an hour to do it right. There's even a sticker on the wire look that tells what each color does!

    Here's the hole I drilled for it in the box side... I wanted to put it in the recess just rearward and a little higher, but I was afraid there wouldn't be enough room between it and the outside of the bed and I'd have a 2" hole with nothing in it... I think it'll be fine here.


    After wiring up the connector, smearing a little rustoleum around the fresh hole, and screwing it into place, it looks right at home...


    You'll also see that I put in another tie down just in front of the wheel well, on the bed side. That's so my camper battery can get lashed in like this:


    Next thing I need to add are some HD floor tiedowns for the front of the camper. Looking for some removable ones like FWC used to use, but may just do two more U-bolts through the floor near the front where the cross rail is. With a little 1/8" plate to back them up, I'll pull the tie downs off the camper long before the U-bolts pull through the bed floor or the cross rail pulls off the bed!
    Last edited by 1stDeuce; 06-13-2011 at 07:37 PM.
    The sign reads: USE FOUR WHEEL DRIVE LOCKED AT ALL TIMES ON THIS ROAD - NO LUG OR TRACKED VEHICLES ALLOWED

    '06 GMC K2500 CCSB D/A -- '94 Hallmark Ute 8.5'
    '00ish Jeep TJ Scrambler
    '99 XR400R
    I'm my own boss now, I do what I want!!!
    KB9SCX

  8. #8
    Join Date
    Jan 2006
    Location
    Reno, NV
    Posts
    1,088
    I just found the wiring for my camper yesterday when I was attempting to wire everything up for my new to me FWC. Gotta love having factory wiring ready to go. Did you install the 30 amp fuse under the hood in the stud #1 postion yet? I struggled with why the red 12v was not hot. Did a little searching and found out it needs the fuse to put power to that wire. All is well now.

    Also, if you have a Fastenal near you, they have "nut" hook/loops in 3/8 and 1/2" sizes that all you have to do is drill up through the crossbed supports, run a bolt up through and tighten it down and you now have a very strong anchor point.

    Jack
    2007 2500hd, Max/Alli, Hawk FWC (the new explorer)
    Build thread: http://www.expeditionportal.com/foru...07-Chevy-Build
    2006 Jeep LJ Rubicon
    Build thread: http://www.expeditionportal.com/foru...006-LJ-Rubicon
    KE7NCK

  9. #9
    Join Date
    Jun 2007
    Location
    Reno, NV
    Posts
    86
    Quote Originally Posted by 1stDeuce View Post
    Ok, a little more work done over the last few days... First, I wired up and in-bed RV connector so I can plug my camper in, and so my gooseneck wiring isn't hanging over the tailgate anymore. Kudos to GM on this one... On the HD trucks with a tow package, the wiring is already run to the front of the box, wrapped up and zip-tied in place!! All I had to do was drill a hole, feed the wires up through, and put a connector on. Took all of about an hour to do it right. There's even a sticker on the wire look that tells what each color does!
    I had no idea that the tow package included that -- I'm going to have to take a look at my truck and see if that wiring is there too. I have a 2000 GMC Sierra 2500, with the HD option package (not a "2500HD" per se, but AFAIK, mechanically identical to the 2001 2500HD with the primary exception being the semi-floating vs. full-floating 14-bolt). Mine has a factory tow package according to the RPO codes.

    Where was the factory wiring stowed on your truck? Zip-tied to the frame somewhere near the front of the box?

  10. #10
    Join Date
    May 2011
    Location
    Farmington, NM
    Posts
    367
    Yeah, actually it's right above the frame rail between the box and cab if you have it.
    Not really sure when it started, so you might not... ??
    C
    The sign reads: USE FOUR WHEEL DRIVE LOCKED AT ALL TIMES ON THIS ROAD - NO LUG OR TRACKED VEHICLES ALLOWED

    '06 GMC K2500 CCSB D/A -- '94 Hallmark Ute 8.5'
    '00ish Jeep TJ Scrambler
    '99 XR400R
    I'm my own boss now, I do what I want!!!
    KB9SCX

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