The trouble with a Clark or any other like OD transmission is they got the OD location from third gear, so when one is wound out in second gear, direct is next which isn’t too big of a deal with a two speed rear, but with a single speed, and when hauling a load, one is usually stuck in second when climbing a hill, very frustrating.

If one never hauls a big load, and doesn’t drive in the mountains, it is OK.

Ed

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.