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Dallas,

As mentioned above, get the u-joint assembly and speedometer gears (the drive gear on the u-joint yoke and the driven gear that screws into the enclosed driveshaft bell-housing).

If the transmission is from a truck larger than the half-ton, it is possible the u-joint rear yoke will not work with your driveshaft. I had to obtain a 4-speed u-joint that was specifically made for a 1/2 ton enclosed driveshaft (it is harder to find that a 3-speed u-joint). In addition, the speedometer drive and driven gears are made to match the ratio of the rear end (and tire size). It is almost impossible to find the correct combination of speedometer gears for a 1/2 ton 4-speed drivetrain (unless it comes with the set-up from a 1/2 ton truck). Nonetheless, if you can't find the correct speedometer gears, use whatever gears you can find - you will just have to correct (in your head?) your speedometer readings.

Good luck, Tim