AAR p/s pump.

I am restoring an AAR for a customer, my p/s pump pulley is not lining up, trying to figure out what is going on, I know the crank and water pump pulley is correct. the casting number on the p/s pump is 2537955 with a 3 spoke pulley. Any input would be appreciated.

Mine has a federal pump with a solid pulley, if that helps. Sounds like you have the wrong pump and/or pulley. You may have a BB pulley. The SB with the Saginaw pump has a different offset.

This one doesn't have a solid pulley, I have no clue where the customer got this pump from, definitely wrong. Just trying to figure out what I need. Thanks.

Photos would help.

I do not recall seeing any original AARs or T/As with a solid pump pulley.

The pulley is 7 inches in diameter. casting number on pump is 2537955. Customer supplied his own parts. He started out with the wrong crank pulley, I have the right crank and w/p pulley on now. definitely something up with the pump, pulley, or
both.

No Saginaw pump on a 1970 340. Aren't they federal pumps on them?

Here's the original pump on my AAR.

would you happen to have the casting number that's on the bottom of the pump? and possibly a photo looking straight down from the top. I would like to see the distance of the pulley to the pump body. Thanks.

Hope these work for you.

Thanks, I have the same casting number, I must have the wrong pulley on the pump or crank, My water pump lines up fine so I think I can eliminate the crank pulley, looks like your p/s pulley sits closer in.

I dug out the two I had. One is from a car without AC & the other had AC.

The pulleys are different on mine.

The non AC version has curved spokes.

The AC version has flatter spokes.

Rough guess without measuring is close to a 1/2 offset difference between the two.

If needed I can put them in the parts washer for a cleanup & get photos.

The pulley on mine is sitting about a half inch to far forward, looks like I have an a/c pulley on the pump from your info. Thanks for checking.

Here's a pic of my AAR pulley after bead blasting. I was unable to make out the numbers where I have the X's.

Hmm, maybe reverse the pulley? Disregard.

it appears the Federal small block pump used the same pulley 1970-'73 #2951 901

per the Parts Catalog(s): 19-54-86 PULLEY, Pump B/J

1970 (May 1970)
2951 901 - 318 & 340 w/3/8" threaded hole pump shaft (A & B-bodies also)
2951 989 - 318 & 340 w/key slotted pump shaft (B-bodies also)

1970-'71 (January 1972)
2951 901 - 318 & 340, 340 3-2bbl w/3/8" threaded hole pump shaft (A & B-bodies also)
2951 989 - 318 & 340 w/key slotted pump shaft (B-bodies also)

1973 (September 1972)
2951 901 - 318 & 340 w/3/8" threaded hole pump shaft (A & B-bodies also)
2951 989 - 318 & 340 w/key slotted pump shaft (listed as E-body ONLY)

neither of these pulleys are shown in the '69 Parts Catalog
neither are shown as used on a C-body
the 2951 989 is also listed in the '72-'73 Truck Catalog for B/W/D & 225/318/360

Dont forget the inspection markings..

HOLLANDER shows:

AAR & T/A FEDERAL pump w/reservoir (NO pulley) #3004 799 the same as 1969-'72 C-body

VS.

E-bodies FEDERAL pump w/reservoir (NO pulley) #3004 800 the same as 1969-'72 B-body and others

& I lightened FM3AAR's pic

If you run out of ideas you can put the pulley in a press and rebend it to the depth you need to line up. I have done this to quite a few over the years. Then install it on the pump, clamp the pump in a vise and spin it to check pulley run out. If you need to adjust it you can just bend it by hand. The 3 spoke pulleys are very easy to bend.

Looks like I have the wrong pulley on the pump, Thanks everyone for the help, I appreciate it.

I cleaned mine up for photos. These pulleys are the same diameter, both pumps are 955s but notice the pulley to pump offsets.

The one at left is from a 340 with 3.91 gears, so it has the cooler.

Same pumps again, notice the curved spokes on the pulley at left vs. the straighter spokes at right.

One more, same 2 pumps again.

Cooler removed from the one on the left so these can sit flat on their backs. Notice the gap from the pulleys to the face of the housing where the part number pad is & the overall height also.