Power Steering Pump Question

[thumpernickle]

I am in the process of replacing the power steering pump and reservoir on my 1979 Silverado. I ordered a remanufactured one from AC Delco through RockAuto using their by application selection process. When I got it, the pump was "clocked" wrong in the reservoir and would not fit as the fill tube faced the wrong direction (it conflicted with my A/C compressor). In other words, the mounting holes to mount the pump/reservoir to the engine mounting bracket did not line up. They were at about 1 and 7 o'clock in relation to the fill tube. On my original pump the mounting holes are at about 3 and 9 o'clock in relation to the fill tube which allowed the fill tube to face away from the A/C compressor.
I have since gone to NAPA and O'Reilly's and their by-application computer result gives them the same thing.
I have also checked my father's 77 and 75 trucks and they are the same as mine.
What do I need to do to get the correct power steering pump? Do I need to specify A/C? What application uses the power steering pump I received from RockAuto? Any information would be greatly appreciated.

[88Jimmy4x4]

Heres the pic of my AC Delco pump I put on my 76 350, does yours look like mine?....what part number did you buy that doesnt work?

[thumpernickle]

I bought AC Delco part number 36-516012. Your pictures show what my truck looks like now, with the old pump on it. But when I attach the bracket to the pump, the filler tube is pointed in the wrong direction (towards the A/C compressor).

[88Jimmy4x4]

I got mine at rockauto and it was part # 36-517023 and was $52.79

[Krwright]

Try one from a '70 c/10 the holes are clocked different but the shaft will be keyed so you'll need a pulley too
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[88Jimmy4x4]

lol...just buy the part number I gave you...pictures prove it fits so theres no risk

[thumpernickle]

Thanks for the help 88Jimmy4x4, I will give the part number you got a try. Any idea what application the one I got is suppose to work on? In other words, why are some clocked differently?

[88Jimmy4x4]

Originally Posted by thumpernickle

Thanks for the help 88Jimmy4x4, I will give the part number you got a try. Any idea what application the one I got is suppose to work on? In other words, why are some clocked differently?

I went to acdelco website and it shows the number you bought as being correct for a 1979. The number I have is for 76-78. Could be you have a bracket from a older truck but I dont know.

Only differences I saw for the years was with hydraboost and without hydraboost. I think hrdraboost is where it connects to brake booster iirc.

might want to do more research before you purchase unless they have one locally you can compare the two in person.

good luck

[v30crewcab]

hydroboost just gives you an extra return port on the can.

[thumpernickle]

It is my understanding that hydraboost uses vacuum from the brake booster, a feature I don't have.
Anyways, thanks for the help. I guess I will just return what I have and go to a local parts store and find one that is "clock" correctly. Wish I knew why they are clocked differently. I realize my brackets could be for an older truck, but based on how unmolested the rest of the truck is I have my doubts.

[88Jimmy4x4]

well maybe your truck is an early 79 and the factory was still using 76-78 pump brackets....who knows