Google 3053A to get ratios. I think it is a pretty wide ratio trans, OD is not very high, someone make higher ratio gears for it. Takes a normal bell housing but has 5th hole.

I agree with Tommy, many trans’ that are just made from a direct 5 speed, unless one has a 2 speed rear, the jump from 2nd to 3rd is too big.

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.