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

By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please register for an account above!

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

When posting on this site you won't have to explain what the 3500HD Beast is! ie 19.5 wheels, straight axle, 10 bolt wheels, 15000lbs GVW, 4 Wheel Disc Brakes etc

We are based in the U.S. If you are not from the U.S. or Canada (all IP addresses checked) you will be rejected. If you are a legit overseas applicant, contact me via email:

Welcome to the forum created October 2009

Recent Posts

Pages: 1 [2] 3 4 ... 10
Tech - Help Area / Re: Repair manual?
« Last post by RPF207 on October 23, 2018, 05:43:39 PM »
My 1999 c3500HD came with a diesel supplement. GM part #15728504 (A Second edition) and although I believe these HDs have different emissions than regular pick up line the book says it covers both. If ya need any pics from the book let me know.

Tech - Help Area / Re: Brakes
« Last post by zeroghost on October 23, 2018, 12:55:25 PM »
Ugh, yep. I found an image from a diesel and they are clearly downstairs. Had they not already had it for inspection i'd swap the brackets myself but now I'm paying for it to be done. Damn the mechanic who changed out the kingpins prior.
Tech - Help Area / Re: Brakes
« Last post by jd8420 on October 22, 2018, 09:06:31 PM »
They should be on the bottom.
Tech - Help Area / Brakes
« Last post by zeroghost on October 22, 2018, 07:39:20 PM »
So, my mechanic isnt certain but he thinks my steering knuckles are on the wrong sides because the brake pad isnt sitting just right. The spring and wedge for the caliper are up top and so is the locking screw. Is this the correct position? He seems to think they should be on the bottom but doesnt have a reason other than thats just how he feels about it. I bought a few manuals but they dont show any of those parts even in the exploded diagram.
Tech - Help Area / Re: Repair manual?
« Last post by ED-NY on October 22, 2018, 08:00:34 AM »
Thanks Richard...just checked on eBay the prices are up there but now I have the numbers.
Tech - Help Area / Re: Repair manual?
« Last post by someotherguy on October 20, 2018, 07:56:04 AM »
Hey Ed, not that I can see anywhere.  There's a different kind of numbering scheme that you can search for though.

NATP9442 - 1994 C/K Truck Driveability, Emissions, and Electrical Diagnosis Manual
NATP9431 - 1994 C/K Truck Service Manual
NATP9437 - 1994 Light Duty Truck Unit Repair Manual (also contains some non-GMT400 info)

I believe there's also a "Diesel Supplement" that goes more in-depth on the 6.5td but I don't have it.

The three books I listed are the typical set of manuals, at least for 1994.  Over the years, what comprises a set seems to change up a little bit.

In doing a little searching apparently there's also:

NATP9432 - 1994 Chevrolet/GMC P3 & P/G Chassis Service Manual
and the diesel supplement -
NATP94DIESEL - 1994 GMC C/K, G, P3 Truck Shop Diesel Supplement

Tech - Help Area / Re: Custom chip burned
« Last post by MrC. on October 19, 2018, 12:48:20 PM »
Thank Ed.
I sent you an email a few weeks ago.

I will get you that serial number, I am just looking to maximize what is there, nothing really special.

I had a bad pickup coil, I chased that problem for 2 weeks and a few hundred dollars, but its figured out now. I new the knock sensor was not hooked up, when I bought it, it ran good, so I didnt fix it, I found out that the SES lights was blown, i fixed that, now I find out it has been trowing a code for the knock, I have ordered one and a pig tail for it, should be here tomorrow.
I have the high pressure fuel pump and sock, I am installing this weekend. I also found the sway bar links for 3$ discontinued on rock auto I needed the bushings. I have shocks,bushings, links ordered as well.

I live an hour from the area hit by Hurricane Michael, I have a load of supplies and my tractor heading out next week, just trying to iron out a few bugs before I go.

Tech - Help Area / Re: Custom chip burned
« Last post by ED-NY on October 19, 2018, 07:57:34 AM »
Which ecm is the truck using, does it have a removable prom or is it soldered in? For example the 1227747 ecm has soldered in proms that can be un-soldered and replaced with a ZIF socket.  Then you can flash an eprom and insert it in the zif socket.

Been a while but I have converted 747 ecm's in the past with zif sockets and can burn the eprom...but need to know how you want it burned.  Suggest that you join this forum and seek their guidance as how to alter (tune) the bin.

In the meantime can you look at the ecm and give me the Service Number and the four letter bin Code?

You need get the knock sensor figured out, make sure you have a 454 specific knock sensor.
Tech - Help Area / Custom chip burned
« Last post by MrC. on October 18, 2018, 09:08:51 PM »
Hey, does anyone here burn chips for the TBI ODB1 engines?
I would rather not buy a hypertech or jet unless that was a better option.

My 454 gas is stock with a turbo 400 with overdrive. I am looking to override the B.S. sensors and maximize the HP and Torque, from what is already there. I have just replaced and upgraded the whole ignition system chasing a bug, turned out to be the coil pickup under the button/rotor. It is running better than ever, but now it throws a knock sensor code.

so if anyone makes these let me know,
I took a 50 m.p.h. tumble in a freeway crash on my Ultra Limited in '14;  broken left hip, broken left wrist, damage to all 3 zones of my back, TBI.  I can muster good wrenching sessions in a heated shop, but alas, I fear my days of heavy work are gone.  I'm bailing from the 1 1/4 ton platform for a restoration project, I have other plans for my low mileage 8100 Vortec and Allison 5 speed.

The 3500HD is solid, I found it in the Nebraska plains last year.  The 6.5TD isn't running and the wiring is a bit cut up, it does crank.  I can take more images to post and send.

Call or text 248-893-9220, no listings elsewhere yet.  Please leave voicemail if I don't pick up, cell service is poor and slow here in the boonies.

Pages: 1 [2] 3 4 ... 10


MILLER TIG Welding Calculator