You are correct, sstock, but he did ask specifically about SM420.
"The truck has a manual trans - rebuilt and lubed. I intended to keep the manual trans, which I thought would require the use of the torque tube. I would love to change it to auto trans too but not sure how to maintain the shifter on the column. "
"I know the trans is original, but how can I ID it as an SM420?"
That link should easily help to differentiate any 3-speed from an SM420 (and, settle that question)?
