AC pulleys question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

robby · 01-25-2004, 12:13 AM

The good news is I sold my 70 GMC and I have the ability to do something else now. The question is will the long pump AC brackets work on a short pump motor? I have the 400 engine from my 79 and I know of a 69 3/4 ton original air that has a bad motor and no pump or brackets. I looked at my 79 and my 70 to eyeball it but can't tell for sure. Thanks for any help.

JimKshortstep4x4 · 01-25-2004, 08:13 AM

I am not sure what you are trying to do. Are you putting the 79 engine into the 69 truck?

Anyway, general rule is that you can't mix long water pump pulleys/brackets with short water pump pulleys/brackets. The belts will be out of line. The long water pump setups normally have the AC compressor on the drivers side. (The short water pump AC compressors are on the passenger side).

My suggestion would be to change the water pump and accessories to fit the year of the vehicle. Trying to mix and match
can be very frustrating.

Jim

robby · 01-25-2004, 01:05 PM

Yes, 79 engine into 69 truck. I know the long and the short of it but looking at the pulley location on the 79 AC compressor appears to be the right location to make it work. Does anyone know for sure? If not are AC brakets rare as hen's teeth?

**kwmech** · 01-25-2004, 01:33 PM

It may be easier to scroung around and find the proper set up.

robby · 01-25-2004, 09:33 PM

ttt

01-25-2004, 12:13 AM	#1
robby Semper Fidelis Join Date: Dec 2001 Location: Cedar City, Utah Posts: 654	AC pulleys question The good news is I sold my 70 GMC and I have the ability to do something else now. The question is will the long pump AC brackets work on a short pump motor? I have the 400 engine from my 79 and I know of a 69 3/4 ton original air that has a bad motor and no pump or brackets. I looked at my 79 and my 70 to eyeball it but can't tell for sure. Thanks for any help. __________________ 72 Chevy C 20 with 402 For sale 85 GMC K2500 83 Trans Am Cedar City, Utah (Missouri Native)

01-25-2004, 01:05 PM	#3
robby Semper Fidelis Join Date: Dec 2001 Location: Cedar City, Utah Posts: 654	Yes, 79 engine into 69 truck. I know the long and the short of it but looking at the pulley location on the 79 AC compressor appears to be the right location to make it work. Does anyone know for sure? If not are AC brakets rare as hen's teeth? __________________ 72 Chevy C 20 with 402 For sale 85 GMC K2500 83 Trans Am Cedar City, Utah (Missouri Native)

01-25-2004, 09:33 PM	#5
robby Semper Fidelis Join Date: Dec 2001 Location: Cedar City, Utah Posts: 654	ttt __________________ 72 Chevy C 20 with 402 For sale 85 GMC K2500 83 Trans Am Cedar City, Utah (Missouri Native)

01-25-2004, 08:13 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I am not sure what you are trying to do. Are you putting the 79 engine into the 69 truck? Anyway, general rule is that you can't mix long water pump pulleys/brackets with short water pump pulleys/brackets. The belts will be out of line. The long water pump setups normally have the AC compressor on the drivers side. (The short water pump AC compressors are on the passenger side). My suggestion would be to change the water pump and accessories to fit the year of the vehicle. Trying to mix and match can be very frustrating. Jim

01-25-2004, 01:33 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,630	It may be easier to scroung around and find the proper set up.



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