76 GMC K15 A/C quetion

[GMCStepper76]

Hey all,

I'm sure this has been asked and answered before but I cant find exactly what I need.

I have a 76 GMC K15. I am doing a cab swap. My old cab did not have A/C. My new donor cab does. Its off a 76 Chevy 3/4 ton 2WD longbed.

I have a couple questions about the A/C system. The ac box is on the passenger side. I did not pay attention when I stripped the donor truck for the swap. I have ALL the A/C pieces I just don't know which side the compressor goes on. The donor truck had a 454. I have A/C brackets for the 350 in my truck now. Can someone give me a quick rundown, I also will need new pulleys to run the compressor I just don't know which pulley actually turns the compressor. If anyone has a pic that would also be VERY helpful.

I think I need a 3 groove pulley for the crank and a 2 groove pulley for the water pump. The truck has Power Steering as well.

Thanks in advance Guys. I appreciate your time.
Tony

[Jason S]

If your A/C brackets are for the '76 GMC, then the compressor should be an A-6 style mounted on the driver's side of the engine. 
The crankshaft pulley actually turns the compressor.

Both of my trucks ('73 and '74) have  a 3 groove crank pulley, 2 groove waterpump pulley and 2 groove power steering pulley. 

Brackets for a '74 Chevrolet smallblock V8


Brackets for a '79 Chevrolet smallblock V8


Belt routing for a '79 Chevrolet smallblock V8 - non-California  (lower right for P/S and A/C)


Belt routing for a '79 Chevrolet smallblock V8 - California (lower left for P/S and A/C)


Additional A/C compressor adjustment info from '79


Waterpump, power steering and crankshaft pulley on my '74 Chevrolet K10



Photos from my '74 Chevrolet K10 (350 with centerbolt valvecover heads).  My setup isn't absolutely factory correct, but it works very well.
View of waterpump, powersteering and crankshaft pulley.


View from compressor of waterpump, powersteering and crankshaft


View of compressor mounting


View of compressor mounting brackets at intake manifold


View of lower compressor mounting brackets.  Note: the power steering mounting bracket is modified from a non-A/C bracket. 


Hope this helps a little bit.