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Old 07-08-2017, 02:42 AM   #1
Rednwhitec20
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1971 k20 badmax

I bought a 71 c20 in 2014. Loved the truck but I was always wishing I had a 4x4. It was too nice of a truck to mess with so I sold it to my stepdad with plans to get it back later on and have money for my build.

I had previously had a thread on here but I failed to keep it updated so I am going to redo it here.

I bought a pretty rough 1971 K20 with plans to do a decent frame off with a nice, reliable power plant. Ideas flew around and I ended up with a Duramax. Here's the build my friends.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build

Last edited by Rednwhitec20; 07-08-2017 at 02:44 AM. Reason: Rename
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Old 07-08-2017, 10:01 AM   #2
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Re: 1971 k20 badmax

So then came the work. A bit rusty
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-08-2017, 11:14 AM   #3
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Re: 1971 k20 badmax

I fixed my frame rust and slapped some paint on her. Rebuilt the axle and put her together. Then she went to the corner for a drive line removal.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-08-2017, 11:47 AM   #4
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Re: 1971 k20 badmax

Out she came along with stock springs. I traded for a 6" skyjacker. She then went to get her first round of bodywork, which I wasn't impressed with.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-10-2017, 01:08 AM   #5
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Re: 1971 k20 badmax

Then I bought my engine, trans, and transfer case along with the brains. I cleaned and slapped a fast paint job on the engine, then I sent my harness and computers off to make it all work. Harness was simplified by Ken Wolkens, and it looks pretty good. My ECM and TCM received tuning from Pela Motorsports. And some more bodywork.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-11-2017, 04:11 PM   #6
Dieselwrencher
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Re: 1971 k20 badmax

Your truck has progressed a long ways! Congrats!
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1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1972 GMC Sierra Grande Longhorn 4x4
1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed
1972 C10 Suburban Custom Deluxe
1969 Chevy milk truck
1971 Camaro RS 5.3 BTR STG3 Cam Super T10
1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project


Tired of spark plugs? Check this out.
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Old 07-11-2017, 11:10 PM   #7
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Re: 1971 k20 badmax

Some more body work and then we sat the engine and tranny in. Thank you sir!
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-11-2017, 11:14 PM   #8
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Re: 1971 k20 badmax

Then she was headed off to a friends shop until it drives. I bought a HP Dana 60 that still needs to be installed. I also found a nice tailgate. I then decided I needed a beefier cross member. So I had a friend make this animal.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-11-2017, 11:21 PM   #9
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Re: 1971 k20 badmax

I snagged up my favorite, Welds! Wrapped in 37's. I also got a somewhat economical vehicle. Then bought a used t-case and had it rebuilt and slapped it in. Wiring has begun, and they put in my super beefy crossmember.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-11-2017, 11:25 PM   #10
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Re: 1971 k20 badmax

And this is where I am currently in the build. I went ahead and bought a 14 bolt 11.5" one ton rear so I had more meat out back and I got discs on all 4 corners. new intake as well! Intercooling piping is on its way along with my hog of a driveshaft. I think I'm going to man up and spend some money on A/C this weekend.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build

Last edited by Rednwhitec20; 07-11-2017 at 11:56 PM.
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Old 07-12-2017, 07:42 PM   #11
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Re: 1971 k20 badmax

Very nice! You will not regret doing the AC now!
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1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1972 GMC Sierra Grande Longhorn 4x4
1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed
1972 C10 Suburban Custom Deluxe
1969 Chevy milk truck
1971 Camaro RS 5.3 BTR STG3 Cam Super T10
1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project


Tired of spark plugs? Check this out.
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Old 07-12-2017, 07:57 PM   #12
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Re: 1971 k20 badmax

Quote:
Originally Posted by Dieselwrencher View Post
Very nice! You will not regret doing the AC now!
Oh I know! Now that I have a car that finally has AC, I am hooked!

Driveshaft is in the truck but I forgot to take a picture. 1480 u-joint at the case and a 1410 u-joint at the rear. Pretty beefy. The inter cooler plumbing is in as well. Steering column is about to be put in. Getting a new rag joint. Then once the AC gets wired I will have some piping for my turbskie.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-13-2017, 02:24 PM   #13
Dieselwrencher
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Re: 1971 k20 badmax

Skip the rag joint and go with a Jeep XJ shaft to eliminate the rag joint IMO.
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1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1972 GMC Sierra Grande Longhorn 4x4
1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed
1972 C10 Suburban Custom Deluxe
1969 Chevy milk truck
1971 Camaro RS 5.3 BTR STG3 Cam Super T10
1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project


Tired of spark plugs? Check this out.
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Old 07-14-2017, 08:45 AM   #14
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Re: 1971 k20 badmax

Quote:
Originally Posted by Dieselwrencher View Post
Skip the rag joint and go with a Jeep XJ shaft to eliminate the rag joint IMO.
Well, he's starting to get moving on it and I have no extra money.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-14-2017, 07:28 PM   #15
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Re: 1971 k20 badmax

you can get the xj shaft for $10-15. best mod ever
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Old 07-14-2017, 07:40 PM   #16
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Re: 1971 k20 badmax

Quote:
Originally Posted by v30crewcab View Post
you can get the xj shaft for $10-15. best mod ever
May I ask what it does?
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-14-2017, 10:15 PM   #17
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Re: 1971 k20 badmax

Well I ordered my AC today through vintage air! Im pretty excited about it. Can someone buy my Dana 44 so I can get this 60 built
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-16-2017, 05:24 PM   #18
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Re: 1971 k20 badmax

the xj shaft gives you nice ujoints on both ends, for dirt cheap. eliminates the slack of the rubber disc.
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86 k30, 89 diesel burb, 76 gmc pathfinder
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Old 07-16-2017, 09:36 PM   #19
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Re: 1971 k20 badmax

Quote:
Originally Posted by v30crewcab View Post
the xj shaft gives you nice ujoints on both ends, for dirt cheap. eliminates the slack of the rubber disc.
Are they bolt in?
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-17-2017, 01:03 PM   #20
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Re: 1971 k20 badmax

Quote:
Originally Posted by Rednwhitec20 View Post
Are they bolt in?
Yep.
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Old 07-17-2017, 01:41 PM   #21
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Re: 1971 k20 badmax

Quote:
Originally Posted by DieselSJ View Post
Yep.
Well I have a friend with 3 totaled xj's so I'll go that route. Thank you for the help!
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-24-2017, 05:12 PM   #22
Dieselwrencher
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Re: 1971 k20 badmax

If he wants to sell another let me know. I need one for my 76. I stole it off and gave it to a friend. Now it is steerless.
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1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1972 GMC Sierra Grande Longhorn 4x4
1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed
1972 C10 Suburban Custom Deluxe
1969 Chevy milk truck
1971 Camaro RS 5.3 BTR STG3 Cam Super T10
1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project


Tired of spark plugs? Check this out.
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Old 07-28-2017, 08:30 PM   #23
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Re: 1971 k20 badmax

Quote:
Originally Posted by Dieselwrencher View Post
If he wants to sell another let me know. I need one for my 76. I stole it off and gave it to a friend. Now it is steerless.
If I can convince him to sell me any first.

Does anyone have a cheaper was to draw fuel from a 1/2" line other than a sump?
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-30-2017, 10:24 PM   #24
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Re: 1971 k20 badmax

Intercooler piping mocked up with stainless. Blue tape is where she'll be welded, but both of his Tig machines are down for now. Until Lincoln can get him a new machine it'll probably be connected by boots and clamps.
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1971 C20 Daily, Built 350/700R4
1971 K20 Project, LLY Duramax, 5 speed Allison, and 8 in lift on 37x13.50s
K20 Build
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Old 07-31-2017, 03:22 PM   #25
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Re: 1971 k20 badmax

I'd see if you can find some one to weld them first. How far from Pittsburgh Kansas are you? There's a board member that lives there that could probably weld these for you. What kind of tank are you using? A draw straw is a lot cheaper and can be obtained a lot of places. I use 1/2" ones in all my builds most times.
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1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1972 GMC Sierra Grande Longhorn 4x4
1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed
1972 C10 Suburban Custom Deluxe
1969 Chevy milk truck
1971 Camaro RS 5.3 BTR STG3 Cam Super T10
1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project


Tired of spark plugs? Check this out.
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