Caseman, the w6's all had the cast frame until the "SUPER W6-TA" in 1954. When they built the TA model, they went to the chanel frame. As with the M-TA's, all '54s were Super W6 TA's weather they had the TA option or not.
BTW, the TA stands for Torque Amplifier. This was a set of planetary gears that replaced the input shaft of the transmission, thus giving two gears in every transmision speed, and was shift on the fly, by means of a clutch that released the planetary housing.
BTW, the TA stands for Torque Amplifier. This was a set of planetary gears that replaced the input shaft of the transmission, thus giving two gears in every transmision speed, and was shift on the fly, by means of a clutch that released the planetary housing.