I have an F-Super Duty, well actually two of them now. Both have hydroboost brakes, which in these trucks perform absolutely amazing.
On my 91 which I have had a fair amount longer than my 94, I put an electric vacuum pump from a 99-07 Super Duty truck to operate the HVAC system. It does just fine, haven’t had any problems with it.
The 94 has a serpentine belt, so eliminating the vacuum pump would be much more difficult… also a non AC, stripped down bare bones truck… only options were diesel engine, automatic transmission and blue paint… nothing else. Nothing.
My understanding is that when the City of Wichita wanted to upgrade the fleet in 94, they were looking forward to the new Powerstroke engine, but later learned they would have to wait another year to get one with an automatic transmission, as no 94.5 PSDs had automatic transmissions, at least from the factory. So they settled for the IDI, which to my understanding they bought a batch of in ‘90, so it was already well proven to them.
It could also be that they wanted the last IDIs they could get, and placed a large order in ‘94. But there are lots of old City of Wichita trucks from ‘90 and ‘94, many IDI/E4OD trucks, and ‘96, ‘99, and ‘04, floating around, at least in my area and mostly further south. Definitely not the first one I’ve seen, plenty of dark blue, City of Wichita, old Ford trucks floating around, I have seen 351, IDI, 5.4 and PSD trucks bearing their mark and the dark blue paint.
Older trucks were 300 I6s and red, usually…
