The 5 spd which originally went in to the T-1 vans wasn't a typical 5 spd. It was roughly a 4 spd with a granny gear. Not sure if there was much difference in the ratio of 5th gear between the 4 spd and 5 spd. Still stuck with a pretty low top end. Both of my vans with 5spd's topped our around 68mph.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13