I know this is an old thread but as I am in the middle of a Saginaw conversion on my 40 I thought this info might add to the collective knowledge. (I have not independently verified this info)
Pump pulley shaft: The Saginaw self-contained pump was offered with two different pulley shafts. The 5/8-inch nut retained keyway style shaft was used from its inception until 1974 and the -inch diameter "press-on" style shaft used from 1975 and on.
Pressure hose connection: The Saginaw self-contained pump was offered with two different high-pressure hose fittings. The 5/8-inch flare connection was used from the beginning until 1979 and a 16mm O-ring connection was used from 1980 on.
Pump mounting studs/holes: The mounting studs/holes changed on the same timeline as the pressure fitting above from SAE to metric.
Source: Saginaw fittings
NOTE: I THINK they meant "5/8" instead of the published "58" - I "corrected" it above.
Pump pulley shaft: The Saginaw self-contained pump was offered with two different pulley shafts. The 5/8-inch nut retained keyway style shaft was used from its inception until 1974 and the -inch diameter "press-on" style shaft used from 1975 and on.
Pressure hose connection: The Saginaw self-contained pump was offered with two different high-pressure hose fittings. The 5/8-inch flare connection was used from the beginning until 1979 and a 16mm O-ring connection was used from 1980 on.
Pump mounting studs/holes: The mounting studs/holes changed on the same timeline as the pressure fitting above from SAE to metric.
Source: Saginaw fittings
NOTE: I THINK they meant "5/8" instead of the published "58" - I "corrected" it above.
