Gmc 7000 Dump Truck

[Piperion Giles]

Irealize i am off topic but i need some help with an old dump truck. I have a gmc 7000. It is a 5 speed with a split real axel. Well, it is stuck on the low side. When i pull the switch in the cab, it does not shift into high range. Can somebody give me some suggestions as to where to begin troubleshooting this problem. Kinda rough runnin down the highway with the motor screaming and only going 45 mph. Thanks to all for any suggestions.

make sure the fuse in the box is good. if not check for power on both wires back at the motor. if that doesn't fix it a switch and motor inside the two speed motor is bad. you have an electric two speed? some chevys used vacuum but i think they are older and smaller. the switch on the shifter will go bad sometimes but not often.

I`d git under with key on not running and have helper flip it on and off to see if you can hear solenoid at rearend clicking. If not, test wires at 2-speed motor and see if powered. Check harness from switch to rearend for breaks. Then check back and we`ll go from there.

The circuit is simple. Power is supplied through a circuit breaker when the key is on and probably acc as well. If electric shift, the green wire to the switch on the stick is power-in. The red and black wires are for high and low, I don't remember which one is which but I think black is low range - it also goes to the speedometer adapter so you can verify it there. You can look for power in and out at the switch, low range power at the speedometer adapter or high and low back at the axle.

If electric, the shift switch has just 3 wires. One is the power wire coming in (fused and probably switched by the ignition key) and the other two feed out to the rear end. One of the two outputs has voltage at all times. The motor drives in or out until it hits the previously mentioned limit switches and automatically shuts off, not drawing any power. Very simple to trouble shoot.

While driving check to see if the speedometer shifts when you move the switch up or down. If the speedometer changes the switch should be Okay. The switch just changes which of the wires going to the rear has power. On the rear unit one of the wires is always grounded and the other two will alternately have power depending on the switch setting.

With the engine off and the ignition switch on---------------you should be able to hear it shifting in the rear axle. On the one that I replaced---------seems like I pulled the motor off and manually shifted the linkage to high; maybe tied it in place and reinstalled the old motor until I could get one. Been along time since I worked on one---------but wouldn't want a mid sized truck without a two speed-----------sure makes for alot more truck.

I have two with electric shift and both have had the limit switches go bad in the motor. The kit to repair is cheap and not a hard job. It will need to be checked but my money is on the limit switch in the motor. The others have covered the dio part, but I would start checking power at the motor, if no power than you go back to the front and start, but motor is easy to get too.

On the same shelf was the book for a GM medium-duty truck, 1 book! I hadn't looked at it in years but it amazed me that back then, the books actually told you clearly and concisely how to fix things! The new books just tell you to attach a scan tool. When they do tell you how to do a procedure, instead of simply reminding you of simple safety precautions like: disconnect battery cable, or chock wheels, they waist two sentences referring you to other sections that when you find them, tell you the very same precautions except in more words!

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There are certainly collectors out there who have the space for storing and maintaining big trucks like this one. $8,500 seems pretty reasonable, given the cost of trucks these days. A new dump body like this one will run almost the cost of the truck being sold here.

One (1) USED 1980 GMC 7000 Dump Truck with approximately 21,720 miles . This mileage may not be the actual miles on this vehicle, but the speedometer/odometer work correctly and BNWRD is the original owner of this vehicle. This is a single axle GAS dump truck. This truck is equipped with a 5 speed MANUAL transmission with a two speed rear axle, a fully functioning 9 foot hydraulic dump bed and a GMC V-8 366 Cubic Inch, 4 barrel GAS engine. This truck IS NOT equipped with Air Conditioning or cruise control. This truck has a GVWR of 27,500 lbs. with the maximum front end weight at ground being 9,000 lbs and the maximum rear end weight at ground of 18,500 lbs.

This unit starts, will propel itself forward and reverse under its own power and has been driven on the road within the past 30 days. This unit has a expired State of Illinois Inspection Sticker (February, 2018). This unit may need additional work to upgrade its condition, including, but not limited to, miscellaneous body work to repair dents and rust damage which includes, potential repairs to the dash and a rip/tear in the driver's side of the bench seat. This vehicle may need new belts and possible mechanical work. This truck has mainly been stored outside and was used to haul miscellaneous material at our facility.

The average weight of a GMC 7000 series truck can vary based on the model and configuration. However, these trucks typically have a gross vehicle weight rating (GVWR) ranging from 25,000 to 33,000 pounds.

The Alabama Law Enforcement Agency said Troy Graham of Bay Minette was fatally injured when the 2004 Ford F-150 he was driving collided head-on with the 2018 International 7000 dump truck driven by 35-year-old Eric D. Nails of Hamilton, Alabama.

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