Smaller Power Steering Pulley?

[75Bronc]

I have a serpentine 351w from a 1990 F250. It has the F250 front dress. I got a junk yard power steering bracket with a Saginaw pump from an E350. It lined up perfect.

It doesn't seem like I have the steering power I use to with the original bronco pump.

Could my pump be weak?

Do I need a smaller power steering pulley? Does anyone have a link to one that would work?

Larger Crank pulley?

I run 35's with lockers front and rear. When I am low RPM crawling, my power steering is very weak. I know the tires and lockers make things worse. I would like to add ram assist in the future, but for right now, I feel that I should have better steering. Even on the street at low rpm it wines a little and is a little tougher than it use to be with the bronco front dress and pump.

Thanks!

 

[SteveL]

There should be an v aftermarket pulley available. I know they are easier to find for the Saginaw keyed shafts than the press on ones. Im dealing with the same thing after going hydro boost with v- belts.

 

[Broncobowsher]

35s and lockers. Probably need ram assist.
Smaller pulley can be faked with more engine RPM. If you rev the engine do you get the power steering you want?

 

[toddz69]

Did you use the pump from the donor E350?

The Saginaw should definitely perform better than the stock Thompson pump so I would make sure the pump is in good shape first before making other changes.

Todd Z.

 

[SteveL]

Yes with a little more rpm the ps works fine.

 

[75Bronc]

I used the e350 pump. I never ran the Thompson pump with a locker. But on the street I definitely think the Saginaw is a little less powerful.

 

[Pa PITT]

75Bronc .. you think your Saginaw is a little weak . All i've been around they have been much better than the any other brand pumps.
& For a 2nd note . When I 1st did my P/S change. I HAD ABOUT 5 Different pumps on hand to try. I discovered there was a valve that the P/S hose screwed into . There were different valve. So Some gave more flow & thus I got my pump to put out more power.