Yup...they started making special forgings...at least for Mustangs... a year or so ago.  Mine is one of the Trooper boxes and the sector seal started leaking a little before FWB last year.  By the time we got home it was leaking way more than a little so I sent it back.  That's when I found out they were making their own boxes. 
Hope you like your's as much as I like this one, Steve.

Also hope you folks have a great Bash this year.  We are leaving Wednesday for a two month trip that will bring us through Texas near the end of Sept. so we will miss the bash.

BB

Just for the Info, TKO, what pump are you using?  I have the stock 5.0 Ford pump and it works just right.

BB

Probably 'splains why the 5.0 pump worked great with the stock 66 setup.

BB

TKOPerformance wrote:

I've run a ton of the Saginaw pumps over the years and only recall one that went bad, and it was on a car that wasn't maintained properly or driven regularly.  They seem to be pretty bulletproof.  There's a bracket that allows running a Sagnizw pump with the stock 5.0 accessory drive.  When I convert over that's what I'm going to do. 
 

I’m attempting to put a Sag pump on my ‘92 5.0 now. The bracket is excellent. The only things you need to worry about are positioning the pulley AND having a hose made. The 4X4 company selling the bracket makes their hose to fit a 5.0 engine in a Bronco not a Mustang. I’m having a she-dog of a time getting someone to make a hose for me. My local fittings and hose guy won’t do it from a liability standpoint. I told him everyone in the industry gets around that by using the ‘ol “Off road use only” clause, but no dice. I even offered to bring in a Notary. Still no dice. I found a place in LA that’ll do it but that’ll eat up an entire day of my life getting there and back.

Ah, see, I didn't even think about the hose part of it.  There's a couple of good hydraulic shops around here, hopefully one of them will be cool and make me up one.  I mean, what's the liability?  You'd lose power assist, not steering. 

Hey! I can wallow in the 20th century if I want to!!

I have the modified Aisin pump on my Borgeson set up. I also have the supplied Saginaw pump. I did have to make my own spacers for the pump installation. The ones Borgeson sent were 1/2" short and the pulleys wouldn't line up. I had the machinist at work make me a couple out of some bar stock that were 1/2" longer, and they fit fine. Biggest problem I had was the damned return line, and having to force it over the nipple on the stub pipe on the pump reservoir. Eventually got it.

I'm running a Ford pump on my 65 with Borgeson and it works perfect!  All the way from Dallas to Fort Walton Beach, Florida and back.  Gotta have the right JBA header on a 351W to clear the pump and the cable clutch.