[GTO JONES]

Is there a power steering pump pulley smaller then 6" dia that will work on a 69 GTO. I'm running hydro boost now and it want's to squall at low RPM trying to park, thought a smaller pulley would speed it up a little.

[Scott Thelander]

I dont think there is any other direct replacement

Ole Pinion might chime in with an idea ...

your 5 7/8 9786900 pulley is it ..

the ac is pulley is larger ....

but ....

what would happen if you ran the larger ac crank pulley 9790842 8"
and
the ac water pump pulley smaller 6.5" approx ..9796061 4" pump
or the 9799128 4 1/2 " pump .. pulley ...
that would make the p/s spin faster and maybe cool better ...
smaller w pump pulley


Scott

I should have those pulleys
2o6 465 9165

[Joel Koontz]

Originally Posted by GTO JONES

Is there a power steering pump pulley smaller then 6" dia that will work on a 69 GTO. I'm running hydro boost now and it want's to squall at low RPM trying to park, thought a smaller pulley would speed it up a little.

I am running Hydroboost and using a LARGER than stock diameter PS Pulley and I am not having any issue like you are noting.

Is the pump in good condition?

Rebuild kits are fairly cheap and easy to install.

[GTO JONES]

Originally Posted by Joel Koontz

I am running Hydroboost and using a LARGER than stock diameter PS Pulley and I am not having any issue like you are noting.

Is the pump in good condition?

Rebuild kits are fairly cheap and easy to install.

Yeah new pump.

[JLMounce]

Is the new pump in good order? Anecdotally I have heard the same and I think it was Nicks67GTO that had posted about going through 3 new steering pumps that although new, were defective.

[GTO JONES]

Originally Posted by Scott Thelander

I dont think there is any other direct replacement

Ole Pinion might chime in with an idea ...

your 5 7/8 9786900 pulley is it ..

the ac is pulley is larger ....

but ....

what would happen if you ran the larger ac crank pulley 9790842 8"
and
the ac water pump pulley smaller 6.5" approx ..9796061 4" pump
or the 9799128 4 1/2 " pump .. pulley ...
that would make the p/s spin faster and maybe cool better ...
smaller w pump pulley


Scott

I should have those pulleys
2o6 465 9165

I'll have to check and see what I have on there. I have a box of pulleys some where I haven't found them sense we moved but there here somewhere.

[GTO JONES]

Originally Posted by JLMounce

Is the new pump in good order? Anecdotally I have heard the same and I think it was Nicks67GTO that had posted about going through 3 new steering pumps that although new, were defective.

That was my first thought but I thought I would play with the pulleys first before I got another pump. I'll probably end up changing the freaking pump.

[BB70]

I'm running a double grooved pulley off a chebbie on the ps pump and using a longer alternator belt on my hydroboost setup.

John

[HWYSTR455]

Since the alt and PS both share the water pump pulley, you would have to change the alt pulley too if you change the PS pulley. Or the belts will move at diff speeds, and squeal.

Think it would be better to change the valve in the pump.

Best thing to do when changing a PS pump, is to remove the valve that's in the original and save it. If the new one gives you troubles, swap to the original valve.

I've seen valves all over the place with replacement pumps. And wow can they cause grief (with Saginaw pumps particularly).

Unfortunately, trying to determine what valve you have and what valve you need is not an easy task. I think Schurkey did a write up on them, with pics, but I found it's not all inclusive.

With that said, it is a common issue with hydroboost to have a groan or over-assist. There are lots of places that sell a replacement valve that supposedly corrects the issue, but, after looking at the charts and doing homework on the valves, I feel it's still a touch of a crap shoot.

http://www.purechoicemotorsports.com...rod/prd412.htm

The above link is an example only, I am not recommending that valve.

Sometimes crap gets stuck in the spool valve in the booster itself, and that creates a load. Can try flushing the system for that.

The valve in the steering box can also be an issue, but not going there, it's most likely ok in your case.

Pumps make noise sometimes in normal conditions, like if you go full lock and hold it there, the pump with groan. So it might be something you will have to live with. You can try bumping the idle speed up a touch, see if that helps.

.

[Joel Koontz]

You CAN change the size of PS Pump Pulley and it will not care what size the Alt Pulley is.

What you can't do is have two different size pulleys that are directly connected together with both of them driven by the crank.

I recently encountered this on a friends Firebird. It had a WP pulley on it that had two different diameter pulleys that were factory spot welded together. A PO had installed it and my friend had not recognized the issue until i pointed it out to him.

I assume that the original application for the pulley assembly with different pulley diameters had only one of the pulleys connected to the crank pulley and then the other pulley was used to drive something else.

Having said that, I doubt(but don't know for sure) that changing the size of your PS Pulley will help with THIS issue.

I was surprised to see that the PS Valve that is linked to says that it REDUCES the flow of fluid.

[HWYSTR455]

Ah. Yes, good catch Joel, not sure why I was deducing that. Yeah, it would have to be crank/water pump pulley to make contention. Apologize for that.

.

[imposter]

try changing the valve in the back

[GTO JONES]

Originally Posted by imposter

try changing the valve in the back

That sounds like the ez one to try first, I'll check into that.