Re: 57-68 WM300 NP420

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Posted by Keith in Washington [] on Sunday, March 28, 2021 at 00:49:34 :

In Reply to: Re: 57-68 WM300 NP420 posted by Vaughn [] on Saturday, March 27, 2021 at 23:07:51 :

Here are some corrections and additional information.

My bell housing is actually 921198-2 it was hard to see the - the date tag says 3 5

The transmission that came in the truck had case # C 38126 with a 1945 date spur gear.

I replaced with another trans with a C 38126 with a 1948 date. Spur gear.

The transmission in there now has a C 98511 casting #. It has the lower upper mounting tab on the drivers side, which matches the spur gear mounting pattern.

If you look at this link for VPW on NP420 late synchronized transmissions you will see that both the M37 and the PW have the same casting # C98511. But there is a note that Type E vehicles have a different mounting holes than civilian models. So it appears that there were C98511 NP420 transmissions with 2 different mounting bolt patterns.

So it appears that I have a late M37 transmission case with civilian gears and top mounted to a spur gear bell housing.

If you look at DC’s site he states the following. In the picture he references both transmission have casting # C 98511..

Used from 1950 to 1964 this 4 speed was call
( np420 ) New Process Transmission . Came in different configurations of top and cases , different input spline and different bolt patterns with 1 or 2 PTO openings, there are two versions 1950 to 55 (left in Photo ) and 1956 to 64 (right in Photo ) synchronized in 3rd ,4st gear

So both DC and VPW have statements that the NP420 have more than 1 bolt pattern.

Looks like you need to do a little more research. It took me longer to take pictures of my casting numbers than it did to look up the references at VPW and DC that there are different bolt patterns.

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