You boys forgot the old Rock-Crusher Pre-SM420 4 speed...
The "Original" Granny First Transmission.
Granny gear has its place, and as Hotshoe mentioned, I primarily use it as a three speed (2nd, 3rd, 4th) with 1st reserved primarily for pulling up trees and changing the rotation of the planet.
I rather like it... It comes in handy.
Originally posted by Hotrod Lincoln:
1st. gear on that transmission is designed to get a heavy load moving. It is not a regular road gear. The SM420 transmission does not have a synchronized 1st. gear, so the vehicle must be at a complete stop before engaging it, or severe grinding will result.
You can downshift into first using the double-clutch three-step, but you need to get the truck down to about 5-10 mph (depending on the rear end and engine) to do it.
