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I picked up a 70-74 Camaro PS pump from autozone a few days ago which is a nut retained pulley style. I can not figure out what the thread size is on it. Its not 1/2 course or fine thread and a 14mm won't fit. Is this a special GM thread? it measures .550" on the OD of the thread
You would need a thread pitch guage to find thread and match. Get a metric and standard to check it.
Its not 1/2 course or fine thread and a 14mm won't fit. Is this a special GM thread? it measures .550" on the OD of the thread[/QUOTE]
Did you try 9/16" UNC or UNF?
Bob
If it's a 70-74, it is too early to be metric....mrrilla's suggestion
has merit. If you still are baffled, call a power steering pro
like Howe Steering
http://howeperformance.com/contact.html
I have found these boys to be very knowledgeable about GM
pumps.
mike in tucson
You know what is super funny? I'm going through this same exact dilemma on my '69 el camino. It seems to be 9/16 thread, but I can't find the nut anywhere. I tried parts stores, ace hardware, and the only thing close was Home Depot, they had an empty box for a while but they don't stock it anymore. I was actually going to try the chevy dealership today, and I saw this thread. How funny is that. I'll let you know if I get it at the chevy dealer.
I tried several wrecking yards trying to scavenge a nut from an old pump but finding a nut retained PS pump is hard. A 9/16 nut may work but thats not very common. Please let me know if you find a solution 69elko, there are so many of these pumps on the road I can't imagine this is a problem.
Hey Denny, that reply was nuts. :whacked:
http://paddockparts.com/Paddock/prod...3F4F0FD2A16F89
Hey thanks for that link, I didn't realize that would be so hard to find locally.
Well, the dealership had a part #, but it was discontinued. It's 9/16-18 thread. I ended up going to GM sports salvage and pulling the nut off a 64 GTO pump. I don't know if you have any places like that in Texas, but GM Sports Salvage has everything from old Gm's to new ones. You're going to have to find something older than 1975 though. The newer pumps have pressed on pulleys.