I have a 1973 Nissan 620 pickup truck 2WDQuestion:  I'm helping my son work on his '73 620 pickup. We recently acquired a 5-speed tranny that came out of something with a Z-series engine, as we had to swap the front half with another tranny to get it to properly bolt up to his L-series engine. I am trying to find a rebuild kit for his tranny, but all I'm finding are kits with a 60mm countershaft bearing, and his has a 56mm. Could you provide any insight as to what this might have come out of, and what rebuild kit may be available for it.Answer:  The correct rebuild kit for your application is part number MWT-104WS your cost is $116.40 and this does have the 56mm c/s bearing.