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RPO Z77 was the 1980 Chevy Sport/GMC Street Coupe exterior graphics packages that exclusively used the cloth seat with the addition of the floor carpeting, deluxe front grille, and deluxe instrument cluster. The option also included Rally wheels as standard, was available only on the 1976 to 1981 Chevy/GMC short bed 1/2 ton pickups.
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.
With a 20 year old vehicle, the original towing capacity does not apply. I'd set a limit of whatever the weight of your vehicle is as a safe number (if car weighs 3,200 lbs, tow weight is 3,200lbs Max.) Trailer weight is also determined by the capacity of the hitch. Trailer loading should be at 60% of weight on hitch. Don't forget...you need a fully functional cooling system, adequate (most times additional) transmission cooling, and good suspension (air shocks, variable load rear springs and fresh differential lube). If this is done, you may be able to add 20-30% more trailer weight. One item often overlooked is that it really does not matter if you can pull a load...you need to be able to stop it. Make sure your brakes are in really good condition!!!
Here is a link to specs for that year model of truck, I would need more info such as auto/manual, and 4x4 or not. Anyway it's an easy chart to read. But technically speaking a 1/2 ton pickup is only rated to carry 1,000 lbs in the bed. I wouldn't personally suggest doing more than that, if you overload the bed you can have trouble steering and stopping. I hope this Helps please rate this thank you