Truck will not go into 4 wheel drive

PDF]1980 service manual - 73-87ChevyTrucks.com. Classic ...

www.73-87chevytrucks.com/.../ST_330_80_1980_Chevrolet_Light_Tru...

Wiring diagrams for 1980 trucks are contained in a separate Wiring. Diagram Booklet.... Some of these service operations require the use of tools specially designed .... 1-1/2 Ton. 2-3/4 Ton. 3-1 Ton. 4-1/2 Ton (W/HDSusp). Fig. 0A-3-Vehicle Identification Number ... Right Hand Side of Cylinder Block at Rear of Distributor.

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Complete 73-87 Wiring Diagrams - 73-87chevytrucks.comforum.73-87chevytrucks.com/smforum/index.php?topic=11766.0Apr 8, 2009 - 1 post - ‎1 authorHere are the complete wiring harness schematics for the 73-87 series. These are HUGE jpgs so you may want to save and print them off.[PDF]1980 Chevy - 73-87ChevyTrucks.com. Classic Chevy ...www.73-87chevytrucks.com/.../ST_330_80_1980_Chevrolet_Light_Tru...1980 Chevrolet Passenger Car and Light Duty Truck Unit Repair (Overhaul). Manual.Wiring diagrams for 1980 trucks are contained in a separate Wiring. Diagram Booklet...... 8-Cylinder Gasoline Engine Code is (305, 350, 400. CID) Located ...

It should be the 700 r4 transmission with the 350 block,
unless someone changed it out, it could be a turbo 350, if the truck is a 3/4 ton.
if you have 3 gears and over drive it is a 700 r4
only 3 gears turbo 350

sorry you cannot put a 4wd trans. into a 2wd vehical..

the sensor may be bad, you can purchase a new one at the auto parts store.

The eighth digit in the VIN number on the trucks dash (view from outside the truck on the drivers side) is the engine code. I believe M is a 350 and P is a 305.

here you are my friend. Now i went way out of my way for this so i hope this is what you are asking for :)

HAVE YOUR PLUNGER FOR THE DIFF CHECKED IT SHOULD BE UNDER THE BATT TRAY

the shifter accuator or the wires going to it on the transfercase..gl

its a possibility that the transfer case might be going out or the fluids in it are bad sometimes after alot of mileage the tranfer case will slip or stick

I have this same problem with my 2001 Chevy Silverado 2500HD. I found a recall on a website that said there were 1,353,718 other trucks with this same problem (no, that's not a typo). Do not ask the people at Chevy to uphold to this recall because I was turned down when I informed them about the problem. Anyway, the explanation for the problem is the wheel speed sensor mounting surface has rust and corrosion (especially in areas who have roads that get salted a lot) on it that moves the actual wheel speed sensor away, creating the thought of an icy condition. If you or a mechanic has the area cleaned, the sensor will go back to its original position, thus fixing the problem.