Power steering pump bracket & pulley - were 4x4's different?

[joeydurango]

I'm replacing all sorts of things on my '72 K10 to get it more road-worthy. While I have the radiator out and belts off, I was going to replace the power steering pulley, since the old one is pretty badly bent. But I've had a heck of a time finding the right pulley, and learned a few things along the way. The stock pulley for a SBC power steering application is available through Alan Grove Components, but it sits too far forward for my setup. My crankshaft pulleys are correct. AGC sells a special set-back pulley, but that's too far back. I sent some photos to those guys, and they said I had the 65-66 power steering pump bracket. Apparently the "stock" brackets for a '72 (in most applications, at least) bolted to the block and then "jogged" rearward, setting the pump back another quarter inch. Searching here, however, I find a lot of people looking for the same pulley I have and need, PN: 3993325DJ I doubt all those trucks got swapped over to a 65-66 bracket.

Did the 4x4 trucks come with an older style bracket for some reason, setting the PS pump further forward? Anyone have a photo of their PS pump bracket on a 72 4x4? As you can see in my photo, this PS pump bracket bolts to the block and comes straight out to the pump, with no rearward bend.

Finally, I haven't been able to find a new/repop 3993325DJ pulley anywhere. Anyone got one laying about they'd like to move?

[notsolo]

Different project but Using the pump bracket from my 72 Blazer 4x4 it looks just like yours except no plate behind it, yours looks like its shimmed 5/16 off the motor. Actual pump looks identical.....I will look for a pulley.

[joeydurango]

That plate behind it is the main portion of the bracket itself! The front half just holds the pump straight, but the main mounting bolt and the belt tension adjustment bolt are on the back of that rearmost plate. Now I'm curious to see what your bracket looks like.

[57taskforce]

Here's a few shots of mine on my 72 K/20. looks to be the same bracket as you've got, well to me anyway. Sorry it's a bit dirty, all that dang blowin dust!!!

[57taskforce]

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[57taskforce]

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[joeydurango]

Thanks, Tyler. Yep, that looks the same. Looks like the same pulley too - if you get a chance (or are just bored), can you check the stamped part number on the front of the pulley? Should be 3993325DJ with that bracket and crank pulley, but I want to make sure. Shallow stamping, so some of that blowing dust we've had will have to come off of there...

Looks to me, from Tyler's photos and other 4x4 posts looking for this pulley, that 4x4 '72 (probably other years too) trucks had what the Alan Grove guys call the "65-66" PS pump bracket. Anyone else got further photos to confirm?

[57taskforce]

Your correct Joey, my truck does indeed have the 3993325dj pulley. I just looked.

[joeydurango]

Okay. Great. Thanks Tyler!

Now all I've gotta do is find one of those pulleys and I should be set...

[stsalvage]

trust me there are 3 different brackets and trust me you would have a few choice words to say about them brackets

the one you have is still be made today its such a nice handy brackets easy to get to the bolts.Come's apart in 2 peaces looks good when you powder coat them in black

[notsolo]

Here is the bracket that came on my 72 K5 Blazer.

[joeydurango]

Notsolo, that makes sense. That's the front half of the bracket. But the pump mounts to something on the back side too - there's a threaded stud at the bottom and top of the pump. The bottom one goes in a fixed-position hole in the backing plate; the top one goes in an arced slot, and that's how the belt tension is set. What's the backing plate look like?

[notsolo]

Well that's just it, no backing plate... Could be it was lost in a motor swap. I can not say for sure if the pulley was miss aligned or not it's been out of the truck for 5 years and the photo s I took are not too good.

[joeydurango]

Oh, bummer. The backing plate is what will have the rearward "jog" or not. Mine and Tyler's above are flat, with no jog. I suspect yours was as well. Thanks for the photo anyway!

[palallin]

FWIW, the brackets on my '69 K-10 differ considerably. If a pic would help, I can try to get one later--storm coming in now.

[joeydurango]

A photo would be great - the only thing we have so far is '72 photos. Anytime is fine!

[Smith & Sons]

I went round & round with this problem too & finally discovered that the General did some different things with their truck power steering brackets that make for an odd setup.The common denominator I used to solve the problem was to go to the Corvette PS bracket sold by Alan Grove.Then you can use the stamped steel Canadian pulleys they sell.It all lines up & Their pulleys are unbeatable quality,without the untrue problems that come with billit pulleys.

[dazza]

Here's a few shots, (a '72). Can't find the part number on the pulley.

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[Smith & Sons]

The truck brackets are cast iron & require truck pulleys.My crank pulley is also cast iron & very Heavy. Car PS brackets (read Corvette) are stamped steel & so are the corresponding pulleys-much lighter.If your ever adding power steering to a truck--Stay With The Car parts & you'll be glad you did! Then if you ever have to replace a part,your working with something common that you can get parts for.

[joeydurango]

Dazza, that looks once again like the same bracket Tyler and I have. And yours is a '72, so we've got a pattern here.

Smith & Sons, I thought about doing that same thing. Is your truck a 4x4? I'm not clear on why the bracket might be different, so just clarifying the set-back bracket works on 4x4. Also, can you remove/install the bracket type that interfaces with the motor mount while everything is together in the engine bay? Looked like an awfully tight fit to get at the attachment bolt at the motor mount.

[notsolo]

Looking at my old crappy photo's I found a trace of the missing bracket. more research here for an idea what to look for...sure enough it took a couple hrs to find it.

[57taskforce]

Yep that's eactly how mine was I remember that smaller bracket was a pain in the butt where it bolts to the motor mount.

[joeydurango]

Yeah, that's the guy. I was wondering what the motor mount attachment looked like. That is tough to get to!

Okay, so we've got photos of '72 4x4's with this bracket. What would make this thread helpful to future searchers is some context with other years and 2wd, too. Did this bracket show up on other year 4x4's? Any year 2wd? If anyone cares to post photos of their brackets for future research help, now's the time.