Posted by Phil Street on Monday, June 21, 2004 at 10:17PM :
In Reply to: Re: Don't know but ... posted by Jake Burley on Monday, June 21, 2004 at 9:34PM :
Power-Wagons came with 3 different transmissions over the years - 2 non-sync and 1 sync - the NP420 (See web link below for pics of the 3 transmissions).
Serial number 83942118 works out to a 1954 C1-PW and should be equipped with the "after type" non-synchromesh transmission.
The NP420 is a synchromesh transmission and was used in Power-Wagons starting sometime in the 1956 model year.
It looks like the Helitool link that Will provided has all the info you need.
Good luck with the project!
Phil