I'm running the T-19 myself.. Got my adapter from Tom's and used my 6-cyl spud shaft.. Tough as nails and I can rock and jam gears in the mud and not worry about it
From Novak's site:
Ford & Scout T19's
Very much similar to the T18 in appearance and build is the T19. This four-speed transmission is different from the T18 and others in that it usually features taller gearing and a synchronized first gear. It was introduced in Ford trucks in the 1968 model year.
Three gearing options were available for the Ford T19. The T19 was available with a 6.32:1 first gear. These were only in rarer Ford 500-800 series HD trucks. The very most common T19 available in Ford applications was the T19A with the 4:02:1 first gear ratio. For two years (documented from 1983-1984) there was a Ford T19 with a 5.1:1 first gear. All ratios listed had a synchronized first.
We've learned that the 1983 to 1986 Ford T19's, as installed behind the 460 and diesel had the 4.02:1 first gear, in a 2wd application, or a diesel 4wd application. The 460 4wd truck got the 6.32:1 first gear, purportedly from 1983 to 1986 F250's.
The T19 transmissions are equipped with dual PTO ports.
The IH Scout T19 was available from 1975 to 1980 with close and wide ratio options. As for the IH T18, they had a unique case and input shaft that make most Jeep conversions impractically expensive.