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Discussion Starter #1
I'm trying to find out if anyone has used a larger diameter pulley that they've been happy with.

My steering is overboosted and I'd like to reduce the pump speed to reduce some of the assist out. I saw drudis' page where he shows a picture of a pulley from Ford and I took the part number from it, it comes up as being for an '82 T-bird 3.8L but the part is obsolete. I also did a search and found some talk of using a Mustang V6 pulley but figured I see if anyone has a range of model years that they've had luck with before I order one.

Thanks
 

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I had an old project car, a 1986 mustang with the 3.8 v6, and it is the larger diameter pulley like Daris shows on his website...I put it on my mustang...the one that has yet to hit a track :( ....anyway, I hope that helps some?
 

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I believe the actual part # and what is comes on (in the pick-a-part yards) is covered in the Junkyard Horsepower thread here on Corral. Just search for the thread the search the thread for "pulley".
 

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There are at least two larger PS pulleys. The 3A733-A shown in Darius' website is a 6 rib and I believe that one is no longer available from Ford.

There is a similar 8 rib pulley that was used on SC T'birds. Sorry, I don't have that p/n but that one might still be available.
 

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Another way to help with the overboost is to cut the relief spring in the pump. I learned about it from the FFR guys, did it to my track car and it definitely helps. My FFR doesn't have PS, so I wasn't sure how well it would work until I got my track car finished. It's an easy modification, doesn't cost anything, and is reversible if you don't like it (you do have to buy another spring though). Basically if you remove the large fitting on the stock ford pump, the one the high pressure line screws into, underneath that fitting is a spring. Stock length is around 2" I think, you cut it (I used a dremel with a cutting disc) to 1 5/8" I *THINK*, then reassemble. This allows more fluid to recirculate in the pump, which equals less assist to the rack. If you do a search either here, on corner-carvers, or on the FFcobra.com website, you can find pictures and the exact lengths. YMMV.
 

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Discussion Starter #9
There is a 6 5/8" pulley which is part number YR3E-3D673-AA. I have a spare if anyone is interested.
I took the engineering part number you listed here and cross-referenced it to the selling part number. The part number anyone looking to buy one at the dealer is: YR3Z-3A733-AA.

It's still available from Ford. I haven't installed it yet but it looks like it will work well. I'll try to also come back and note if I needed a longer belt and how much longer it will need to be once I get around to putting it on.
 

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I took the engineering part number you listed here and cross-referenced it to the selling part number. The part number anyone looking to buy one at the dealer is: YR3Z-3A733-AA.

It's still available from Ford. I haven't installed it yet but it looks like it will work well. I'll try to also come back and note if I needed a longer belt and how much longer it will need to be once I get around to putting it on.
Just installed that pulley last week. I have had it for a year or so sitting in the garage. When I bought it the parts guy knew it quite well. Guess they sell a lot of them.

As for belts, I went from a 84.5" belt to a 86.8" belt. YMMV.
 

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Discussion Starter #12

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Is there enough slack with stock belt and tensioner to run this pulley, or is a new belt mandatory? If so , part number for the right belt? Car has factory air, smog etc.
 

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Is there enough slack with stock belt and tensioner to run this pulley, or is a new belt mandatory? If so , part number for the right belt? Car has factory air, smog etc.
As I noted above, I needed a longer belt. I have no smog, mix matched underdrives, and modified A/C system so my actual belt length is unique. Your belt length will be different but the change in length should give you an idea of where to start.
 

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I got a larger pulley from Dorman (my wife works there) and it works fine. I can't honestly remember what part # it is but i think it is a 300-003. I remember I took measurements at the time (width & center hole for pump)and matched it up to the one I have now. It's just under 6" in diameter and works flawlessly on my race car. It was also only a fraction of the cost of one from Ford (around $10) I think.
 

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Discussion Starter #17 (Edited)
Got the pulley installed today and that overboosted mess seems alot better now, much weightier feeling to the steering in all situations but just off center.
 

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I got a larger pulley from Dorman (my wife works there) and it works fine. I can't honestly remember what part # it is but i think it is a 300-003. I remember I took measurements at the time (width & center hole for pump)and matched it up to the one I have now. It's just under 6" in diameter and works flawlessly on my race car. It was also only a fraction of the cost of one from Ford (around $10) I think.
Sweet! Thanks for the tip!

Looking at doing the pulley, cutting the spring, and installing a rack off of a new-edge car. Plus the requisite rack bushings and MM shaft :joy:
 

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I got a larger pulley from Dorman (my wife works there) and it works fine. I can't honestly remember what part # it is but i think it is a 300-003. I remember I took measurements at the time (width & center hole for pump)and matched it up to the one I have now. It's just under 6" in diameter and works flawlessly on my race car. It was also only a fraction of the cost of one from Ford (around $10) I think.

Thx for the info man!

I went to Schuck's and bought the PS pulley p/n 300-003 for ~$10. I installed it on my '86 5.0. The change is noticable. It took me a few days to really notice it. But eventually the difference became more and more clear. Still not ideal. But better.

So here is the info I gathered on my install that may be of interest to anyone that cares about specifics.

Stock Pulley Diameter = 5.33 inches
Doorman Pulley Diameter = 5.8125 inches
-I divided "Stock" size by "Doorman" size and got an 8.3% difference in size. I don't know if that directly translates to 8.3% underdrive. Maybe someone else can confirm or deny.

Stock Pulley Weight = 21.3 ounces
Doorman Pulley Weight = 11.85 ounces
-Obviously 10ounces of weight savings isnt going to matter on a 3000lb car. But it does translate into less rotational mass that the engine has to spin. So I consider that a good thing.


cheers!
 

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Hey AOD, did you need a different belt after installing that pulley?

Thanks for listing the part number. For $10 I might just have to give this thing a try.

Has anyone done both the bigger pulley AND the relief spring mod? Is it even recommended that they be done together?
 
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