Home of all dually trucks with the GMC/Chevy 3500HD series truck a point of interest.

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You can appreciate the “beef” of the GMC/Chevy 3500HD trucks, a stripped rolling 3500HD chassis weighs more than a running C1500!

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Welcome to the forum created October 2009

Recent Posts

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Engine-Driveline-Wheels-Tires / Re: TBI
« Last post by MrC. on February 07, 2019, 11:40:12 AM »
Hi Ed,
How would I verify it is going into closed loop? Without a ODB1 scanner
The website that recommended the high volume pump  was very specific with the part number, and even talked about the 3500HD's had smaller injectors but higher pump pressures from the factory.
I have 52 psi running and under full thortle in park (stomp and let off) not loaded moving.
I can adjust the fuel pressure regulator by backing off the screw and jam nut in the TBI. to decrease the pressure if you think that it is over powering the injectors.

Engine-Driveline-Wheels-Tires / Re: TBI
« Last post by ED-NY on February 07, 2019, 07:01:45 AM »
I realize the idle goes up and down..but I would also make sure the truck is going into "closed loop" after warm up. 
3500 & 3500HD Complete Trucks FOR SALE / Re: 1996 diesel with 8ft bed
« Last post by someotherguy on February 06, 2019, 01:36:23 PM »
Cool truck, looks like they did a decent job of converting it to a pickup bed.  I'd wonder if it has the rare wide-track rear axle or they used spacers to get the wheels out to match the dually fenders?  And, what kind of job did they do to relocate the spring hangers, and cut driveshaft etc. to move the axle forward 4" to make up for the wheelbase difference...check the quality of their work.

As far as the running issue, I'd run, too.  But I'm pretty biased against the 6.5TD.  There are others here that have had better luck with them, and you can also check on some of the diesel-specific forums though I can't recall which one is supposed to be the good one - it's either diesel page or diesel place.

At least it does start and run so you can hopefully verify it runs correctly before it quits.  I notice he doesn't mention any of that in the ad itself.  You can dump a lot of money into trying to make a 6.5TD reliable...and then some of them just pop for no reason and now you've got cracked heads, or a cracked block, or broken starter bolts with a damaged starter pad on the block, all other sorts of potential nightmares.  Did I mention I'm biased?

Engine-Driveline-Wheels-Tires / Re: TBI
« Last post by someotherguy on February 06, 2019, 01:29:34 PM »
I honestly have no idea what amount of pressure the TBI's regulator is capable of dropping, but since the spec on the 94-95 7.4 is 26-32 psi I'd say the Vortec pump is probably too much for it.  Vortec spec being 58-62 psi and you'd figure the pump is capable of more than that if 62 is the high end of the spec...

3500 & 3500HD Complete Trucks FOR SALE / 1996 diesel with 8ft bed
« Last post by MrC. on February 06, 2019, 10:54:48 AM »
I am trying to purchase this one, low miles, looks sharp, needs a black box? otherwise it shuts off.
I have know Idea what a black box is, I am a gas owner, but love this truck.

 1996 GMC Sierra 3500 - $4200 (Cairo, Georgia)

1996 GMC 3500 Dually
fuel: diesel
title status: clean
transmission: automatic
1996 3500 GMC Dually Pick-Up Single cab, 8 foot bed, 2WD, automatic, AM/FM Cassette, has AC and Heat, 6.4 Diesel, Mileage: 112,146

$4200.00 cash only (price reduced from $4500)
Call Jess anytime at show contact info
Engine-Driveline-Wheels-Tires / Re: TBI
« Last post by MrC. on February 06, 2019, 10:32:04 AM »
So things have been so much better after the tbi rebuild and vortec hi volume fuel pump, it starts better, has way more power, runs smoother. cold fast idle is 1200rpms and warm idle is 1000. in drive with foot on brake is 850rpms.

So now only two issues- fuel mileage this last tank was 5. thats right 5 mpg, it smells rich at idle, no smoke, no loading up, no stumbles, runs great. Could my 50psi fuel pressure be to much for the injectors? could that make it run rich? I have replaced the TPS, I cleaned the IRC. along with the a full rebuild of the TBI. I replaced everything from the fuel pump, sock, filter, rebuilt TBI, replaced TPS, MAP, Temp, O2 sensor. NO codes or lights.

I also replace everything from a new distributor to new plugs on the electric side of things.
what am I missing?

Intros - 3500 HD History / Re: HISTORY OF GM 3500HD BY YEAR?
« Last post by someotherguy on January 22, 2019, 05:04:13 PM »
In the spirit of posting VIN's with decoded information here are the three 3500HD's I've owned in the past:

1993 Chevrolet 3500HD 1GBKC34F3PJ108864
SPID label was illegible.  VIN decodes to USA built, Chevrolet (incomplete vehicle), 14001-16000 lb GVWR, 2WD, 1 ton, 2 dr reg cab, 6.5 td, 1993 year model, Janesville WI plant.  Appears to be original 159.5" wheelbase and no frame stiffener plates, came to me with a utility bed on it, ex-Waste Management Corp. service truck.  Never ran the VIN to get the RPO codes as it was just a parts truck.  Plain Jane manual locks, manual windows, non-tilt steering.  Originally white but repainted yellow with orange stripe likely by Waste Management.  Had very dark gray interior trim, darker than the regular light truck trim, more like the early 1988-1989 different interior colors.  Automatic trans (4L80E) and A/C-equipped.  In this picture it appears the grille and grille filler have been replaced with 1994-up pieces possibly after a crash.

1994 Chevrolet 3500HD 1GBKC34F1RJ112673
SPID label was illegible.  VIN decodes to USA built, Chevrolet (incomplete vehicle), 14001-16000 lb GVWR, 2WD, 1 ton, 2 dr reg cab, 6.5 td, 1994 year model, Janesville WI plant.  Appears to be original 135.5" wheelbase and no frame stiffener plates, came to me with no bed, title indicates former flatbed, belonged to a construction company.  Plain Jane manual locks, manual windows, non-tilt steering.  I ran the VIN to get the RPO codes, it actually came from factory in tan color (code 61U) as opposed to so many coming just plain white.  Tan interior plastics and cloth seat as well.  Manual trans (NV4500) and A/C-equipped.  Had an aftermarket cruise control module added.  Most of you here are familiar with this truck as the one I rebuilt and converted to a Vortec 7.4 and full new interior swap and eventually built it into a wrecker.  In this picture "diesel" bumper appears to not be original equipment as we discussed earlier in this thread.

1995 Chevrolet 3500HD 1GBKC34N6SJ109913
I do have a pic of the SPID label but never bothered to decode it.  VIN decodes to USA built, Chevrolet (incomplete vehicle), 14001-16000 lb GVWR, 2WD, 1 ton, 2 dr reg cab, 7.4, 1995 year model, Janesville WI plant.  Appears to be original 159.5" wheelbase and factory frame stiffener plates, came to me with no bed, formerly was a wrecker.  Power locks, power windows, tilt steering; Silverado style trim including chrome grille and composite headlights, but vinyl floormat.  It actually came from factory in gray metallic color (code 8798) as opposed to so many coming just plain white.  Gray interior plastics and cloth bench seat as well.  Manual trans (NV4500) and A/C-equipped.  Some of you may recall this is the truck I repaired the crash damage on and did a few other repairs/upgrades before selling it.

Intros - 3500 HD History / Re: HISTORY OF GM 3500HD BY YEAR?
« Last post by someotherguy on January 22, 2019, 10:54:28 AM »
I have a 1992 base model 3500HD with the following VIN 1GDKC34K7NJ503034
The truck was a municipal trade-in at a local dealer. It had almost 7,000 miles. Now it has over 13,000.
Truck specs:
350 5.7L, 5spd NV4500, Rockwell Rear. No air, no radio, manual windows and locks.
Has power steering and hydroboost brakes. Truck is equipped with a 12ft Rugby dumping rack body.
Recently I converted the truck to super single rear wheels and 285-70R19.5 Michelin rears and new Michelin 225-70R19.5 fronts.
In my state anyone with dual rear wheels and a twin axle trailer is ticket bait. Single rear wheels takes the truck off the DOT radar.
I recommend the conversion. Total rear tire capacity dropped from 15,000lbs to 13,220lbs which I could live with.
Now the truck feels like a big pick-up. It's smooth, quiet, and fun to drive.
I would like to find information on the Rockwell rear axle. It would be a worthy upgrade to install a locker.

Thanks for posting those details!  I think the original 5.7-equipped HD's are pretty rare.  I wonder if the purchase was a cost-saving measure since it was a city vehicle?

One thing that always surprised me were the HD's around here that were AT&T trucks.  All the ones I saw were not A/C-equipped.  That's pretty brutal when you expect your work crew guys to run around in SouthEast Texas in trucks with no A/C, but I bet it saved AT&T a lot of money on the front end.


This is an unfinished project that needs finishing. I have been working on this for 1.5 years and burnt out, and now my wife and I are moving so the truck needs to go. I am not suggesting a selling price rather taking the best offer I can get. I stopped counting how much I have invested at 25,000. It was too depressing to keep counting. Below I will explain what I have done and what the truck needs to be complete.


- block from GM its a brand new block not rebuilt, 7.4 liter vortec 454, this is the L29 engine. block was align honed, honed with deck plates, zero decked, and fully deburred.
- CP pistons and 6.535 long H-beam billet rods
- Scat steel crank balanced at Ohio Crankshaft
- Ferera high nickel stainless valves.
- Comp cams bee hive springs.
- New guides
- 5 angle valve job
- all new internals = roller lifters, roller cam, all clevite bearings, timing set, oil pump, pan, intake, injectors from 5 - O motorsports for the L29, damper, alternator, power steering pump, water pump, belt, plugs, wires, distributor, coil, module, AC compressor, tensioner, motor mounts, all fasteners and sensors.

- Jesel shaft rockers
- radiator and hoses
- oil cooler

(all engine machining was done by Dean Newcombe) The engine is completely new and full of really nice parts. I build it to be used for the long haul. Not to be a race car. I specified parts for high quality in machining and materials. No expense spared)


- Fully rebuilt 4l80E by Keith Harris of City Chevrolet the head transmission re builder
- torque converter is an ATI billet triple disk. It was custom made for the trucks weight, rear gear, engine and use. Its meant to never slip, and hold up for heavy duty applications.

- Rear Axle-

Fully rebuilt at C&R racing. I have them change all bearing races, add a detroit locker, REM polish the ring and pinion and the floating axles. I made a billet rear differential cover spacer that allows the axle to hold 3 more quarts.

- Rest of the truck-

Interior is stock GM, I added full power seats from a loaded suburban and had them recovered and rebuilt from Chuck Hanna. full power seats. It has a Kenwood radio and nice door speakers. I added heat and sound insulation in the entire cab and laid down a new carpet. The head liner and visors are new. Exhaust system is stainless true dual exhaust with magnaflow stainless mufflers. Front lights are HID, rest of the truck is LED. Front axle has been stripped and powercoated, front and rear hubs rebuild. New bronze bushings in the front hubs. All new bearing races and bearings. (front and rear) new calipers, brake lines, brake pads, shocks. I installed new leaf springs, all suspension bolts, steering box, front steering has been fully replaced with new parts.

The wheels have been stripped and power coated and new tires mounted. Michelin fronts and contential rears. The wheels are commercial sized 19.5 inch.

There is far more I have not listed but you get the idea. When I was building this I was planning on owning it for 20 years and towing and hauling heavy. I have a custom stainless steel gas tank, and aeromotive inline pump. (still uses OEM sender and gauge in the dash)

I made and almost finished the flat bed, it can be removed but its very heavy duty, I built it from 3" x 4" steel box tubing 1/4" wall.

It needs a small list of things to finish and tidy up:

- I put a block heater in each bank of the block and they leak a very small amount. They need to be replaced or changed out for freeze plugs.
- The fuel system needs some love. One of the pre-filter socks needs to be removed to lower the restriction to the pump and raise the operating pressure. ( I added 2 pre filter)
- the stock type fuel pick up needs to be take out and put back in in slightly different so the arm has full travel, right now the arm is interfering with a baffel and read full all the time.
- rear light wiring needs to be finished.
- I have (2) 1/4" aluminum thick diamond plate sheets that need to be attached on the frame of the flat bed.
- the truck needs to aligned. ALL front steering parts have been changed and it need a toe adjustment.

Please call me, do not text I have a flip phone. I am very busy so leave me a message and I will call back. I believe with a couple of work sessions the truck could be up driving no issue. It does run and moves around, right now its under a big tarp.

Feel free to ask questions and call. Like I said I have over 25 grand invested and I need to move on. Please make an offer in person. I do not do business long distance, and I have a time frame of about 4 weeks on this. If I do not sell it I will store it and get to it later.


call me at

704-929-7935 I live in mooresville, North Carolina
3500 & 3500HD Complete Trucks FOR SALE / Re: 2000 C3500HD Utility body For parts
« Last post by ED-NY on January 21, 2019, 07:19:46 AM »
Great parts deal...wish I was closer. Auto/manual?
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