We bought a new '88 F-SuperDuty (450) diesel and the only gears offered were the 5.13. The truck would run 70 mph but you'd be pushing 3000 rpm if I remember correctly. Just not a lot of power in the N/A 7.3. I had a '94 F-350 dually with the N/A 7.3 Turbo (factory) and was really surprised how much more power the turbo provided. That was still a simple engine but quite a bit more power than the non-turbo 7.3.
'19 F-450 King Ranch
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