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Old 08-15-2019, 11:28 AM   #1
85chevytrucker
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72 gmc duramax build

Hi thought I'd start a build thread on my current project. It's a 72 gmc that I've had kicking around in my back yard for a couple years now. I also had a bunch of duramax parts leftover from previous builds and figured I might as well build something with it all. Frame was an 05 3/4 ton reg cab with 6.0. Stripped it down and moved axle ahead about 6 inches. Also had to put a shortbed fuel tank to clear axle and added a fass fuel system I had
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Old 08-15-2019, 11:35 AM   #2
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Re: 72 gmc duramax build

Cab floor was rusty so I ordered one piece floor cab corners rockers and kick panels. Last weekend I cut the floor out. A few hours later cab floor was tacked in place and cab was set on frame.
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Old 08-15-2019, 11:42 AM   #3
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Re: 72 gmc duramax build

Sat the engine and trans in and then lowered cab onto frame to see how it fit. The floor fits the new chassis nicely. The bed floor will have to be raised about 4.5 inches to match cab. Engine is an lb7 with 68mm turbo profab manifolds and uppipes. Getting some bigger nozzles for it also.
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Old 08-16-2019, 10:05 AM   #4
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Re: 72 gmc duramax build

Very nice work so far! The one piece floor replacements are great. I sprayed my new floor top and bottom with raptor liner to protect the new metal. How did the cab mounts line up on the duramax frame? Great choice on the LB7 too, I love my deleted LML daily driver.
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Old 08-16-2019, 10:46 AM   #5
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Re: 72 gmc duramax build

Thanks. The front cab mount lines up with an existing hole in the frame. I just had to drill it bigger and pass a long bolt straight through. The rear mount interfere with fuel tank so I had to make new mounts I'll post pics when I get a chance. I wanted cab to sit lower but the rear is sitting on the fuel tank so without relocating fuel tank it's as low as possible.
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Old 08-18-2019, 09:41 AM   #6
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Re: 72 gmc duramax build

You my friend are no slouch. Quite the undertaking! I'm in!

Brian
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Old 08-18-2019, 01:04 PM   #7
85chevytrucker
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Re: 72 gmc duramax build

Got the rockers cab corners and kick panels welded in today. Started on the bodywork.
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Old 08-19-2019, 07:05 PM   #8
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Re: 72 gmc duramax build

Cut drilled and modified the hydroboost braket tonight and bolted it to the firewall. Also welded up the steering shaft.
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Old 08-20-2019, 06:18 PM   #9
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Re: 72 gmc duramax build

Built a new filler neck this evening. The only logical place to put the filler was back in the original location but seeing as tho I wanted to keep the new style tank I had to pass a pipe through the cab. I welded the newer filler neck where the old cap was and an exhaust elbow to back of cab. Hooked up the hoses and done.
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Old 08-22-2019, 06:09 PM   #10
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Re: 72 gmc duramax build

Got the radiator support mounted and fit the radiator and intercooler. It fit tighter than I was expecting. I'll have to mount an electric fan in front of the the radiator stack.
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Old 08-22-2019, 08:01 PM   #11
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Re: 72 gmc duramax build

Looking good.
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Old 08-23-2019, 02:25 PM   #12
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Re: 72 gmc duramax build

This. Is. Awesomeness!
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Old 08-24-2019, 09:22 PM   #13
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Re: 72 gmc duramax build

Nice fabrication and welding skills
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Old 08-25-2019, 04:48 PM   #14
85chevytrucker
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Re: 72 gmc duramax build

Thanks. Not as much progress as planned this weekend but I did run fuel lines and trans lines. Going to hook up radiator and intercooler piping this week and hopefully tackle engine wiring. Should be running by the weekend
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Old 09-16-2019, 07:08 PM   #15
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Re: 72 gmc duramax build

Got a bit of work done to truck. Intercooler piping is done as well as coolant hoses. Mounted throttle pedal and built shifter linkage. Also wired up engine and fired it up. Just need to build a driveshaft and I'll be able to move it around
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Old 09-17-2019, 01:23 PM   #16
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Re: 72 gmc duramax build

its nice to see someone tackle a dmax build every once in a while. cant wait to see it rip around.
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Old 09-17-2019, 06:45 PM   #17
85chevytrucker
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Re: 72 gmc duramax build

Yea it's a nice change of pace. Done so many ls swap they were kinda starting to get boring. Took a short vid of first start last night. Wiring is mess going to mount battery pcm and tcm and then clean up harness. Link to vid https://m.youtube.com/watch?v=inFJgk2cx4Q
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Old 10-20-2019, 02:11 PM   #18
85chevytrucker
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Re: 72 gmc duramax build

Put a rear seat from an 08 crew cab. Took alot of modifying and not sure how I feel about it. I think I'm going look for a factory bench seat.
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Old 02-08-2020, 06:39 AM   #19
85chevytrucker
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Re: 72 gmc duramax build

Took some time away from truck to attend to other projects but I've started back on it. Put new door bottoms inside and out and started on bodywork. I also had to fill and bodywork a bunch of holes from previous mirrors
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Old 02-08-2020, 11:21 AM   #20
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Re: 72 gmc duramax build

This is a proper diesel build. One need not create an abomination of the Cummins kind.
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Old 02-09-2020, 05:59 PM   #21
85chevytrucker
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Re: 72 gmc duramax build

Yea no cummins for this guy. Welded up the cab light holes and wrapped up the bodywork. Sprayed cab with polyester primer so I can start blocking it.
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Old 02-09-2020, 06:04 PM   #22
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Re: 72 gmc duramax build

Pics
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Old 02-12-2020, 12:22 PM   #23
85chevytrucker
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Re: 72 gmc duramax build

Pulled cab back off to paint floor. Going to spray it with tintable raptorliner.
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Old 02-16-2020, 02:08 PM   #24
85chevytrucker
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Re: 72 gmc duramax build

Shaved the heater box off of firewall and sprayed floor and firewall with tintable raptor liner. Going to spray the rest of cabs interior this week.
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Old 02-17-2020, 09:12 PM   #25
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Re: 72 gmc duramax build

Interior and door jams are painted. Sound deadening and new interior parts on the way.
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