"Well the current question is if my original 3spd can be converted to an open driveshaft arrangement."
The poster asking if his 3-speed closed drive shaft transmission (the transmission itself) can be converted to an open driveshaft (similar to how an SM420 transmission itself can be converted)?
That transmission cannot be converted.
Is there a short enclosed-u-joint housing/extension on some Chevrolet 3/4 tons or GMC longbed 1/2 tons that are then connected to an open driveshaft?
