****** http-equiv="content-type" content="text/html; charset=utf-8">Hay Gents do you no much about ZL 4speed in f250 1974 300ci Canadian that's want mine is an boris feels like he wants 1 more gear first is very low an forth is I may just be driving in forth an when i take my foot off he slow's to around 60kms I dont no gear ratio for ZL 4speed can it be ajusted or is it the diff its a Dana 60'' MAKE IT REV HIGH

 

All the 4spds except one light duty one that ford used in a few pickups were 1 to 1 high gear ratio.

If you are only interested in a higher cruising speed, swapping your rear end gears is the cheapest route, depending on what you have.
There are other options, some has converted to the nv4500 5 speed so it is possible.
Others, myself included have used a gearvendors overdrive unit, they are great but a new one is spendy.