CK5
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1991 GMC V3500 Project

Why haven’t I seen this truck driving around? I’m in Georgetown. Leander isn’t far.
I drive it pretty often and my parents live in Walburg but I’m usually just on 35 through gtown. I’ve planned to bring it to pistons on the square many times but something always comes up or it rains. I’ll try to make it on the 15th.
 
Looks great, love it. Did you have the side markers tinted or did you buy smoked ones? Where did you get them from?
 
Finally found a good deal on some 2022 Sierra AT4 steps and got them mounted up. They fit crew cabs surprisingly well and the factory brackets just needed some persuasion to work. They're not SUPER functional in the traditional sense because they're only about 3-4" below the door sills however, they fully protect the rockers and doors from rock chips (of which I already have a few of).

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Man I've been on the hunt for a dually rear end for a while.
 
That damn factory oil cooler stranded me a few weeks ago while on the way to a car show with my daughter.. Clogged somehow (it was only 31 yes old ‍♂️) and blew the line off and subsequently damn near every drop of oil coated the underside of the truck. Shut her down within about 10 seconds, called a friend, and did a roadside repair. Needless to say, I fully deleted the system and it works fine using the parts in the article below. Added another electric fan in its place so I have that colddddd A/C at stop lights still . I’m not really doing any long haul towing so I can’t imagine the need for it.


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Well, interior is officially done. It’s not perfect but I did a lot myself and on a very tight budget. It may get that $15k interior one day, but not today. Door panels and dash is covered in navy vinyl to match the original color. Stereo system is a JL HD900/5, Infinity Reference components, a JL 13TW5v2, and a cheap Amazon special BT radio.

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Wow, can't believe it's been 2yrs since my last post. The truck has transformed just a bit in that time... man, where to start.

Dakota Digital RTX gauges went in about 18 months ago. To me, it's the cleanest, closest to factory style aftermarket gauges. They're pricey but worth every penny in my opinion.

I had ORD build some custom 7" springs for the truck so I could go to 37s. What started with me just wanting some more sidewall ended up snowballing into a new lift.. very smooth riding but feels a little unstable compared to the 4" Tough Country HD springs that were on there. I may look at new shocks soon with some different valving to dial it in.

The biggest change was an engine and transmission swap that took NINE months.. I went with an L8T and 6L90 out of a 2021 2500HD.
  • Swapped the cam for Brian Tooley Racing's 220 Gen V LT cam.
  • Electrical - All powered by a Holley Terminator X Max. This quite honestly has been a nightmare. I don't recommend. I have the factory harness and computer and may swap back to it one day. This is 95% bitching about the "Max" portion which is the transmission controller. Everything tuner I've talked to immediately says, "I wish Holley never built the X Max for use on the 6L transmission series, and I now agree. If you don't know, 6L transmissions use torque based management and the Terminator X Max is very limited as to what it can tune, it's a shit cobbled together solution... so, now I'm fighting some drivability issues.
  • Fuel - Still running dual tanks, Aeromotive 240 stealth in-tank pumps, regulator set to 62psi, filter, etc. and factory tank selector valve works great.
  • Transmission - I found a Camaro SS shifter on eBay for a steal, always wanted a floor shifting squarebody, I dunno, don't ask why.. - some aftermarket Jeep shop makes the brackets to bolt to a 6L90 (weird I know lol).
  • Adapting everything...
    • Engine - Tejas Steel Works Gen V LT motor mounts. I'm running the factory mechanical fan and everything, works great, just had to clearance the hood a little for the power steering pump.
    • Trans - advance adapters 6L90 to NP205 kit. This took a tremendous amount of what I call, "figuring". It's not exactly a bolt on kit and took an additional adapter spacer to get the spline length I wanted.
    • Transfer case - I kept the factory '91 NP205 and modified it for twin sticks from JB Custom Fabrication. After all the changes it ended up within 1/4" of factory drivetrain length so my rear shaft bolted right back in. I still need a front shaft since going to the larger lift, it no longer fits.
Other - there were a TON of other miscellaneous parts to make this happen and really why it took so long. I'm not a great "fabricator" so sourcing various parts that didn't really meet their intended application was the name of the game. All in all, I made it all work.


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Wow, can't believe it's been 2yrs since my last post. The truck has transformed just a bit in that time... man, where to start.

Dakota Digital RTX gauges went in about 18 months ago. To me, it's the cleanest, closest to factory style aftermarket gauges. They're pricey but worth every penny in my opinion.

I had ORD build some custom 7" springs for the truck so I could go to 37s. What started with me just wanting some more sidewall ended up snowballing into a new lift.. very smooth riding but feels a little unstable compared to the 4" Tough Country HD springs that were on there. I may look at new shocks soon with some different valving to dial it in.

The biggest change was an engine and transmission swap that took NINE months.. I went with an L8T and 6L90 out of a 2021 2500HD.
  • Swapped the cam for Brian Tooley Racing's 220 Gen V LT cam.
  • Electrical - All powered by a Holley Terminator X Max. This quite honestly has been a nightmare. I don't recommend. I have the factory harness and computer and may swap back to it one day. This is 95% bitching about the "Max" portion which is the transmission controller. Everything tuner I've talked to immediately says, "I wish Holley never built the X Max for use on the 6L transmission series, and I now agree. If you don't know, 6L transmissions use torque based management and the Terminator X Max is very limited as to what it can tune, it's a shit cobbled together solution... so, now I'm fighting some drivability issues.
  • Fuel - Still running dual tanks, Aeromotive 240 stealth in-tank pumps, regulator set to 62psi, filter, etc. and factory tank selector valve works great.
  • Transmission - I found a Camaro SS shifter on eBay for a steal, always wanted a floor shifting squarebody, I dunno, don't ask why.. - some aftermarket Jeep shop makes the brackets to bolt to a 6L90 (weird I know lol).
  • Adapting everything...
    • Engine - Tejas Steel Works Gen V LT motor mounts. I'm running the factory mechanical fan and everything, works great, just had to clearance the hood a little for the power steering pump.
    • Trans - advance adapters 6L90 to NP205 kit. This took a tremendous amount of what I call, "figuring". It's not exactly a bolt on kit and took an additional adapter spacer to get the spline length I wanted.
    • Transfer case - I kept the factory '91 NP205 and modified it for twin sticks from JB Custom Fabrication. After all the changes it ended up within 1/4" of factory drivetrain length so my rear shaft bolted right back in. I still need a front shaft since going to the larger lift, it no longer fits.
Other - there were a TON of other miscellaneous parts to make this happen and really why it took so long. I'm not a great "fabricator" so sourcing various parts that didn't really meet their intended application was the name of the game. All in all, I made it all work.


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Yep
 
Need more pics! So is it driving now or is the holley holding you back? Is the shofter in yet, or is that still WIP?
 
Nice update!

I know that my ORD springs allow more side to side axle movement than the Tuff Country EZ-RIDE did. A more flexible spring for ride improvement, seems to have more axle movement that isn't great for highway driving. I just drive it accordingly. I have been over 80 mph with mine, even with the soft springs and short wheelbase. It's not my C10, of course..
 
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