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Old 10-26-2018, 01:18 AM   #1
skchevota
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1970 C20 Cummins project RT

Hey guys , this c20 has been in my family since 72. It was my dads truck and I have had it since around 1990. He has been named Rolling thunder since around 94. I think it was a room mate that first said it sounded like thunder in the distance with the big block and loud exhaust. So the name stuck .
I had a build thread in 2007 called project rolling thunder, it was the trucks at the time configuration and I was going short bed . It was lifted with a cummins and an nv4500 with a 4x4 swap . Well the market crashed , the kids were little and I just started a business so the project went on stand by for about 11-12 years . Had to sell the cummins and drive train to make ends meet about 10 years ago . So now I have moved shops a few times, built my business, bought a building , did a Reno on it and all this time was a pile of parts in the corner that was onece my truck . So I decided itís time to make it happen .
I mocked up a few different ideas over the last year or so . I was going to use a newer dodge frame but after getting the cab on it , I didnít like the frame hanging down a foot below the body . So I found a clean unmolested 71c20 frame . I had it blasted and put on some primer and a base coat of black and started mocking things up .
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

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Automotive & Transmission
Greeley, co.
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Old 10-26-2018, 01:25 AM   #2
skchevota
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Re: 1970 C20 Cummins project RT

I was really thinking of going back to it’s roots of 2wd and a big block . I have an 8.1l and 4l80 I built for a Camaro project that I set in and it looks killer . My son had gotten into these trucks now ( my real motivation for getting back on this ) and he likes them low . He has a 68 c20 he is now building , I was really thinking of going low with it . But after mocking it up , it looked cool , but this truck has always been lifted . So I decided I would keep it 2wd but lift , kind of a Pre runner style . Then , I figured if it’s going up , no better engine to use than a cummins . So that’s where is going !
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

Mander
Automotive & Transmission
Greeley, co.
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Old 10-26-2018, 01:44 AM   #3
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Re: 1970 C20 Cummins project RT

Ok , so Iím writing this from my phone while I should probably be sleeping , since I donít have many pictures of my truck on here , but I canít leave you hanging with no pictures. So here is one of the big block sitting in my truck and one of my son, and his 68. I will add some more pictures when I get on my laptop this weekend .
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

Mander
Automotive & Transmission
Greeley, co.
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Old 11-09-2018, 01:14 AM   #4
skchevota
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Re: 1970 C20 Cummins project RT

Got a little done on the engine the other night . I already had most of the long block assembled . I was working on installing the front cover . This is a 2006 common rail , but I didnít have any of the injection or computer so I decided to p pump it .
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

Mander
Automotive & Transmission
Greeley, co.
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Old 11-09-2018, 01:18 AM   #5
skchevota
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Re: 1970 C20 Cummins project RT

So part of the issue with putting a P7100 pump on a common rail block is the bolt pattern changed , and all the gears on a CR are strait cut , a p pump engine has helical cut gears . I centered and installed the case half and have installed to cam/crank, and oil pump gears . The 5 holes that donít have bolts in them are the ones that will have to be drilled and tapped to finish bolting up the case
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

Mander
Automotive & Transmission
Greeley, co.
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Old 11-09-2018, 01:21 AM   #6
skchevota
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Re: 1970 C20 Cummins project RT

I was missing the exhaust manifold bolts so I found a stainless stud and nut kit on e bay for like $16
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

Mander
Automotive & Transmission
Greeley, co.
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Old 11-14-2018, 11:54 AM   #7
rowdy11
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Re: 1970 C20 Cummins project RT

Subscribed. Can't wait to see the progress!
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Old 11-14-2018, 11:59 PM   #8
skchevota
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Re: 1970 C20 Cummins project RT

so I guess I should post some pictures of the various ideas i had and mocked up . These are the truck sitting on a 2007 dodge mega cab frame and axles that I shorted the wheel base on . i wasn't happy with how much frame was hanging down. due to the shape of the frame the cab had to sit really high if i wanted to put e regular bed on it. in these pictures it was just a bed side. i was going to have to go up another 2-3 inches to fit a bed floor at normal depth
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

Mander
Automotive & Transmission
Greeley, co.
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Old Yesterday, 06:31 PM   #9
cornerstone
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Re: 1970 C20 Cummins project RT

Looks like a clean truck!
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Old Yesterday, 08:23 PM   #10
skchevota
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Re: 1970 C20 Cummins project RT

next up was locating a clean frame . I found a 71 c20 roller with a dana 60, rear leafs and disk brakes. i had the whole thing blasted ad then threw on a coat of primer and chassie spray paint. I will re spray the rear half of the frame once I finish doing a few mods
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

Mander
Automotive & Transmission
Greeley, co.
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Old Yesterday, 08:35 PM   #11
skchevota
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Re: 1970 C20 Cummins project RT

the last picture was mooching up the aam 11.5 rear. i got a little ahead of my self, i was thinking about going low, so first I flipped the rear dana to the top of the leafs , and then took the front springs out .I put the front control arms with a shim in the bump stop to simulate a 4/6 drop. the rims i bolted on were from a customer build i borrowed to see how it would look
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70 CHEVY C20,11.5AAM rear, 2006 cummins , P7100 swap , NV4500 Pre runner

68 rs Camaro 496 BigBlock, injection, 4l80e

2017 Ram 1500 Laramie 4x4 crew cab 3.92 , Hemi

Mander
Automotive & Transmission
Greeley, co.
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