Speed,
You will have to remove the u-joint and yoke from the driveshaft side. With the u-joint and rear yoke off, the u-joint housing (bell) can be removed. The gasket/seal kit has:
1. the cork seal for between the bell and the retainer; and,
2. the rubber seal for the rear "neck: of the bell to the driveshaft; and,
3. 4 paper gaskets for between the retainer and the rear of the transmission (a procedure for choosing the correct number of gaskets is in the shop manual - it is a good procedure).
There is no need to remove the transmission and torque-tube. After removing the u-joint, the torque-tube will rotate downwards (and upwards).
Tim