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  1. #1
    Veteran Member pclausen's Avatar
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    Nelson County, VA
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    JD 5085M, JD 1445, JD GT235, JD LT166

    Default Picked up a 1970 GMC C3500 dump truck that needs some TLC

    I found this one locally on Craigslist. Guy was asking $1600, but I got him down to $1200. It runs and the dump cylinder works fine although it is a bit tricky getting the PTO in gear, but once I learn the personality of the truck, I hope that will get better.

    Here it is after I got it off my trailer:



    The sticker in the glove box shows the following options (notice how it originally came with a 292 cu. in. L6):



    It looks like it now has a small block in it, my guess would be a 350. Here are some engine pics. Can anyone help me identify what this is? It looks like it has a later model alternator and the distributor definitely does not look like its from 1970!







    It starts right up and idles nicely, but hesitates really bad when giving it gas, and it stutters and stalls when putting it in gear unless you're real careful and rev it a lot. I pulled the front 4 plugs, and they definitely looks like they should be replaced:



    I cleaned one of them off enough to where I could read the part number. The plugs are ACDelco R45TS.

    I figured I'll start with getting a new set of plugs (whatever the above crosses to at Advance Autoparts), and a new air filter as it is very dirty (its one of those large round ones). I'll also pick up an oil filter (I guess anything that fits a 350 chevy of a 70s vintage should fit?) Maybe I'll pull the old one in the morning to make sure I get one that will work.

    I run 5 or 10W30 Mobile 1 synthetic on my other gas engines. Would I be safe to run 10W30 synthetic in this, or should I stick with dino oil on this old engine?

    It could also use some fresh valve cover gaskets, so once I figure out what engine I got, I'll be able to pick those up as well.

    It definitely needs some work, but I think it could be a good vehicle for around my land to catch chips from my pto chipper and haul dirt around!
    JD 5085M w/ H260 MSL Loader, Frontier AV20G Grapple, Frontier AP13G Pallet Forks, Woods BH1050 Backhoe, Woods SG100 Stump Grinder, Woods RM990 Finish Mower, Woods RB850 3 Way Hydraulic Blade, Woods LR108-2 Rake, Maschio H205 Tiller, Bush Hog 3209 Cutter, Vermeer 906 Chipper, Valby SGR76 3pt Grapple, Shaver 601H Post Digger, Tufline 8' Disc Harrow, Vicon Vari-Spreader MK-II 400, JD 45 16-3 Bottom Plow
    2002 Silverado Duramax 3500 Crew Cab LT 4x4
    BigTex 22.5K 25' Gooseneck Trailer

  2. #2
    Elite Member timswi's Avatar
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    Nov 2008
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    Beaver County Pa
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    Kubota BX23 & RTV1100

    Default Re: Picked up a 1970 GMC C3500 dump truck that needs some TLC

    Love that..I'd have bought that in a minute for 1200...Congrats on a great score.
    BX23TLB & RTV1100 with 72" Power Angle Plow

  3. #3
    Silver Member dschuffert's Avatar
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    Jun 2012
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    125
    Location
    Beecher, IL
    Tractor
    John Deere 3720 Premium Cab

    Default Re: Picked up a 1970 GMC C3500 dump truck that needs some TLC

    That is a great deal!
    2012 John Deere 3720 Deluxe Cab, 300CX Loader w/ 73" HD Bucket, Artillian Forks, 681 Tiller, 72D AutoConnect Mower, 59" Two-stage Snow Blower, Ballast Box, Frontier TR2058 Overseeder, Frontier SS2067B Broadcast
    Spreader, iMatch.

    1953 Ford NAA Golden Jubilee - Currently disassembled waiting for restoration.
    1947 Allis Chalmers Model B - Still running great - handed down from my Grandfather to my Father to me.

  4. #4
    Veteran Member pclausen's Avatar
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    Default Re: Picked up a 1970 GMC C3500 dump truck that needs some TLC

    Thanks! The rear tires are practically brand new and it also appears to have a rebuilt rear axle and new brake lines. I took the rear shocks off as there are no brackets for them to mount to on the frame. I wonder if the original 1970 4.57 rear axle did not have shocks?

    JD 5085M w/ H260 MSL Loader, Frontier AV20G Grapple, Frontier AP13G Pallet Forks, Woods BH1050 Backhoe, Woods SG100 Stump Grinder, Woods RM990 Finish Mower, Woods RB850 3 Way Hydraulic Blade, Woods LR108-2 Rake, Maschio H205 Tiller, Bush Hog 3209 Cutter, Vermeer 906 Chipper, Valby SGR76 3pt Grapple, Shaver 601H Post Digger, Tufline 8' Disc Harrow, Vicon Vari-Spreader MK-II 400, JD 45 16-3 Bottom Plow
    2002 Silverado Duramax 3500 Crew Cab LT 4x4
    BigTex 22.5K 25' Gooseneck Trailer

  5. #5
    Super Star Member murphy1244's Avatar
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    Ohio
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    Kioti DK 40-Massey ferguson 135-Ventrac 4500 Diesel

    Default Re: Picked up a 1970 GMC C3500 dump truck that needs some TLC

    Small block 1974 and up hopefully not a 305. The engine being orange means before they went corporate so early 70s
    Murph ------------

  6. #6
    Veteran Member pclausen's Avatar
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    Default Re: Picked up a 1970 GMC C3500 dump truck that needs some TLC

    Thanks murphy! I'm surprised the original L6 engine was replaced after only a few years, but it might have been worked hard when new. So you think that distributor is circa 1974 as well?
    JD 5085M w/ H260 MSL Loader, Frontier AV20G Grapple, Frontier AP13G Pallet Forks, Woods BH1050 Backhoe, Woods SG100 Stump Grinder, Woods RM990 Finish Mower, Woods RB850 3 Way Hydraulic Blade, Woods LR108-2 Rake, Maschio H205 Tiller, Bush Hog 3209 Cutter, Vermeer 906 Chipper, Valby SGR76 3pt Grapple, Shaver 601H Post Digger, Tufline 8' Disc Harrow, Vicon Vari-Spreader MK-II 400, JD 45 16-3 Bottom Plow
    2002 Silverado Duramax 3500 Crew Cab LT 4x4
    BigTex 22.5K 25' Gooseneck Trailer

  7. #7
    Gold Member
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    Oct 2000
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    355
    Location
    Rutledge, GA
    Tractor
    Kubota L3710DT

    Default Re: Picked up a 1970 GMC C3500 dump truck that needs some TLC

    If you can get the casting number off of the block that will give you the answer as to what is it. (check the driver's side of the block where the bell housing bolts up).
    It looks like a great truck. I have an '83 3500 dump. They're real handy. Put some TLC on that rear brake line set up. Vibration will crack those hard lines.

    SimS

  8. #8
    Veteran Member JJZ 109's Avatar
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    Chaumont, NY
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    Bobcat S185 skid steer - Ferris IS500Z - JD GT235

    Default Re: Picked up a 1970 GMC C3500 dump truck that needs some TLC

    Distributor is definitely an HEI unit. No points in that one. I think they started coming out around '73. I know that I had a '74 Pontiac with it.
    The spark plug number for sure rings a bell in many of the engines I tinkered with and/or swapped out of the '76 K20 & '78 K10 Chevys and '79 K15 GMC that I owned in the 80's and 90's.
    Your option sticker shows a 4.57 rear, so if it's really a 4.10 now there's been a change along the way. Never messed with the heavier trucks so I couldn't tell you about the shocks. I know that the half ton 2WD's of that era had rear coils with shocks.
    I see that it was originally dark green. Brings back memories of my very first vehicle. 1969 C10 with 250 CI six banger, 3 on the tree and factory wood floor in the bed. Also dark green.
    Todd
    _____________________________________________

    Also - E Terra E 60 SSQA backhoe • Erskine 73" blower •TSC QA boom pole • Bradco 48" forks • JLG T350 Boom Lift • 2001 Ford F450 w/Telsta A28D aerial lift • CAM Superline 6x12 dump • (2) Kristi 7x18 enclosed • 2014 Ford F250 Super Cab gasser • 2007 Mustang GT • 2007 Crown Vic P71 Police Interceptor

  9. #9
    Veteran Member
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    Default Re: Picked up a 1970 GMC C3500 dump truck that needs some TLC

    That truck is a steal!
    The distributor is a HEI (stood for High Energy Ignition),one of the best most trouble free electronic ever made!
    For the hesitation, with the engine off, work the throttle while looking in the carburator. It should squirt gas.
    On the front of the carb where the gas line connects to it there should be a fuel filter behind the big nut. Make sure to use two wrenches, the big nut always comes loose first and twists the gas line!
    Also check the distributor vaccuum advance for blown diaphragm or sticking linkage.

  10. #10
    Gold Member farmall 55a case's Avatar
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    case ih farmall 55a

    Default

    Great deal! Good looking truck the 67 to 72 Chevy and GMC are my favorite trucks just a really good looking style in my opinion!

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