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Welcome to the 3500HD.com forum created October 2009

Recent Posts

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1
Engine-Driveline-Wheels-Tires / Steer Axle Specs?
« Last post by bridgepainter on February 12, 2019, 06:18:36 PM »
I've been digging around, even trying to pull part numbers off of mine, but I'm having a difficult time finding specifications for the stock front axle.  Does anyone have a source for these, or figures for the width (mount surface to mount surface)? I have a PDF from GM about the design of the HD that lists the spring spacing at 841 mm (33.1"), as well as vertical offset (114 mm) and leaf spring length, but no word on the actual width of the unit itself.

Any information you've got would be appreciated, I'd rather not jack it up and yank the wheels off, but I will if I've got to.
2
Engine-Driveline-Wheels-Tires / Re: TBI
« Last post by ED-NY on February 07, 2019, 05:00:11 PM »
Since it's running rich..I would get a scanner on it to make sure it's going into closed loop..that way you can view the data stream to verify that the O2 sensors, engine temp signal etc are performing properly.  You need to locate an OBD scanner to verify... I have an OTC Nemisys that does both OBD1 and OBD2.
3
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.

Thanks
MrC.
4
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. 
5
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?

Richard
6
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...

Richard
7
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.

https://valdosta.craigslist.org/cto/d/cairo-1996-gmc-sierra-3500/6809416483.html

 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
8
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?

thanks
MrC.
9
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.


Richard
10
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.

Richard
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