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#1 |
Registered User
Join Date: Aug 2009
Location: Des Moines, IA
Posts: 299
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Re: 1972 GMC "the beast" c20
Yeah mines blue too. Server must have updated or something.
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#2 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
well found out (after being pulled over by cop) that no light in rear of truck work well except for drivers side taillite, reverse license lamp and passenger taillite are dead, and i found out all the wiring from rear to cab is melted seems just the drivers side wiring survived, im pretty sure its from when the previous owner skipped over the external regulator when he wired the alternator, the wiring from headlites alternator and battery caught fire second week owning truck, and found out that was the cause so obviously should checked rear wiring? doh! oddly ive never drivern the truck at night (ive had it 3-4months) so that's why i've probably never noticed the lack of lites. so ive decided to do all new wiring harness front to back, once the wheather warms up, in the mean time im getting a 1975 gmc w454v8 does anyone know who sells a good harness that comes with good directions? thanks
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#3 |
Registered User
Join Date: Aug 2009
Location: Des Moines, IA
Posts: 299
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Re: 1972 GMC "the beast" c20
If you want to get a really easy one I'm pretty sure pain-less makes a wiring harness for our trucks but they don't exactly come cheap.
Last edited by Wideopenracing15; 01-05-2010 at 05:32 PM. |
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#4 |
Sb 400 club
Join Date: Nov 2005
Location: NH / MA
Posts: 2,741
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Re: 1972 GMC "the beast" c20
cool project and a 454 75 should be fun also. I actually ran the trails in Troy in May. Some fun stuff in there but I was the only full size Chevy in the group.... The shop down in the town center does some pretty slick fab work also I am forgetting the name Doctor or custom or something..... Anyway keep up the good work and love the screaming six idea!!
__________________
![]() ![]() 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed ![]() 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out |
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#5 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
thanks! the company is DR customs they are actually two buildings down from me! lol its either the 75' 454 or a 83' 6.2l diesel, was playing in my works garage yard today we use road salt and it melted all the snow and made mud
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#6 |
Registered User
Join Date: Jan 2010
Location: petaluma ca
Posts: 15
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Re: 1972 GMC "the beast" c20
is your truck 2 wheel drive or four wheel
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#7 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
two wheel drive but it does have insane gearing and traction ive taken it down alot of trails and threw the woods, as u can see in some pics.
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#8 |
Sb 400 club
Join Date: Nov 2005
Location: NH / MA
Posts: 2,741
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Re: 1972 GMC "the beast" c20
yeah I am actually part of this group.....
http://www.exploringnh.com/ http://forums.exploringnh.com/showthread.php?t=7099 Like I said mostly jeep and yota guys and gals but there is some cool rigs. I can't remember off hand what all the trails where most was class VI roads tho. Had a blast tho and can't wait to get back out again. Pretty cool group they are all about legal responsible wheeling . mostly trail riding from stocker friendly to extreme
__________________
![]() ![]() 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed ![]() 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out |
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#9 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
u know looking at those pictures i remember u guys all at the dragon palace parking lot i remember wishing i could join! i think i recoginize the trail too i've taken my 72' down it and i only got two wheel drive as long as its dry out that truck does most the trails, it does some mud pretty good but 2wd is well...2wd
![]() Last edited by 292farmer; 01-08-2010 at 08:34 AM. |
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#10 |
Registered User
Join Date: Aug 2009
Location: Des Moines, IA
Posts: 299
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Re: 1972 GMC "the beast" c20
Did you ever get that big block truck?
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#11 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
i went to go look at it from the photos looked mint, he said it was good wanted 1800 but when i got their the floor rugs sagged when u stepped on them, looked under neath no rubber on body mounts and floors were gone and i mean gone the rug was the only solid part and the rear frame was twisted i could see it from underneath and it was on level ground, and he wouldnt budge from 1800 so long story no so im looking again...
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#12 |
Registered User
Join Date: Aug 2009
Location: Des Moines, IA
Posts: 299
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Re: 1972 GMC "the beast" c20
Well good thing you didn't. If the floors are saggy I can only imagine what is under neith.
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#13 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
yeah now i'm looking at either a 77 impala w/305v8, or a 77 trans am w/301v8
hoping to get a new harness soon and some garage space so i dont have to rewire truck in the snow and cold lol |
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#14 |
Registered User
Join Date: Aug 2009
Location: Des Moines, IA
Posts: 299
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Re: 1972 GMC "the beast" c20
Yeah wiring in the cold would just suck. Hope you find something to drive soon. Wiring harnesses will be easy to find, hard to afford.
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#15 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
well it hit 38degrees today so i decided to at least pull out the old harness from the firewall back to the tailights, found about 3 random wires twisted around the old harness not connected to anything, one went to fire wall right below fuse box? three sections fell apart as i was unclipping them from frame guess thats why they dont work
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#16 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
pulled out the radio someone stuffed in, and found out that they were using the power wire off the wipers to power it, after pulling it and all the speakers out, i tried the wipers and they actually work smoothly now not jerking, and wiper pump works too!! thought i was gonna have to replace that guess not now
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#17 |
Registered User
Join Date: Aug 2009
Location: Des Moines, IA
Posts: 299
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Re: 1972 GMC "the beast" c20
Haha I like the exhaust idea. As far as the harness goes, you might be able to go to a local junkyard and swipe one off a truck there, but after 40 years of use I doubt you can find one that hasn't been spliced, rotted, or just messed up.
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#18 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
yeah right now i'm using the old sockets and connectors and installing new wires see if that works, that's assuming all the old sockets and connectors are good. hopefully that works. now im playing with the idea of dropping in a 2002-2006 4.2l inline 6 motor out of a gmc envoy. right now im looking for trans adapters to see if using the sm465 is feasible. but that will be a few years in making probably so still building the 292 up.
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#19 |
Registered User
Join Date: Aug 2009
Location: Des Moines, IA
Posts: 299
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Re: 1972 GMC "the beast" c20
Yeah I'd love some specs on that stuff!
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#20 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
heres the respective bores and strokes
305v6--4.25x3.58in 130hp 240tq 351v6---4.56x3.58in 190hp 305tq 379v6--4.56x3.87 170hp 266tq 401v6--4.875x3.58in 178hp 350tq 432v6--4.875x3.87in 190hp 336tq 478v6--5.125x3.87in 225hp 410tq twin six 702v12--4.56x3.58 250hp 650tq (governer limited to 2400rpm creates 400hp at 4000rpm) 637v8--5.125x3.87 185hp 560tq their were magnum series of these engines, which were basically the same motor but had bigger ports in head. usaully a couple more horse power and torque, these are averages for power varied slighly year to year. check out thunderv12.com they have a dyno video of the v12 hitting over 500hp and 700lbs torque, i have tranny specs and models let me look for them Last edited by 292farmer; 01-20-2010 at 04:47 PM. |
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#21 |
Registered User
Join Date: Aug 2009
Location: Des Moines, IA
Posts: 299
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Re: 1972 GMC "the beast" c20
Man those things made torque like diesels. Did the 702 v12 rev out to 4000 in stock form?
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#22 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
yes but gm installed a governor in it for longevity issues, they wanted it to last forever. they were used in buses and semi trucks mainly ive seen one used as a genarator, had something like 300,000plus hours! put that into road time at say 1mph = 300,000miles! and it didnt smoke! these motors are a little hard to find but not to hard, the bad part is they dont make replacement parts for them u have to find part motors, or have them custom made, the c-60 we own originally had a 351v6 but a 401v6 got dropped it in. the b-60 mack has an inline 6 gas motor which if i remember is 450ci would love to drop a 450ci inline 6 in my truck but dont think it will fit has like 4 7/16 bore and 5 in stroke and it weighs like 800-900lbs
Last edited by 292farmer; 01-23-2010 at 09:27 PM. |
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#23 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
got some updates on the mack motor 464ci 170hp @ 2800 370tq @ 1000 sae so believe gross is like 200-225hp 400-450tq
and they were 5 speed transmissions (6if u count reverse) so my bad. but here are some specs, there were a couple overdrive equipped ones and some still had the 1:1 5 gear ratio they just added a gear between the low and second, to spilt the difference so they isnt such a large gear reduction gap like in the sm465 better for towing and hauling i believe was the idea i just listed some major ones there were like 15different models np 540 series 6.05 to 7.41 first gear options. 540-gd wide ratio 540 gl close ratio 540 go14 had an overdrive of .82 the np 541 had either a 6.15 ot 7.25 1st gear ratio one wide and one close ratio clark 264VO had a 6.06 1st and .8 overdrive spicer 3153c 6:1 1st .79 OD 6853c 5.71 1st .86 OD i have all the gear ratios if you want them i just didnt feel like typing it all i got this info a couple years ago so if some one sees a mistake, please correct me im open to being corrected, i just try to pass on what ive learned, im not trying to be a know it all. im just fascinated with these old trucks and since i cant own them all i read up as much as i can thanks and enjoy!! |
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#24 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: 1972 GMC "the beast" c20
im trying to get the price on this c20 has 350v8 plus sm465 flatbed with tool boxes. think itd be a cool addition to my collection
![]() Last edited by 292farmer; 01-23-2010 at 09:28 PM. |
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#25 |
~Craig~
Join Date: Mar 2009
Location: Kearns Utah
Posts: 169
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Re: 1972 GMC "the beast" c20
Hey there, Just skimmed through your thread and looked at pictures. When I have the time to read it I will. I just thought I'd say I'm glad to see another 1972 Gmc k20 In Here!
Looks Like Its A Great Start. My Thread is "Jack Lallane". And If you need any help or advice Feel free to ask anytime! Best of luck with your project |
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