New Process 420, 4 speed transmission on the floor

[54Dodgeguy]

I did not find any topics like this on any forums, so here goes.  Can anyone help me find out when NP 420's were used in the C1-C8-116 Dodge trucks?

I have started rebuilding the 54 Dodge I have had since 1955.  Most of the parts are hard to find but I am getting there but the transmission looks like it will stop me in my tracks.

I want to keep it as original as I can, so I would like to keep the NP420, which is the transmission that I think is in it now.

Any help on where I can get parts for it; bearings, seals, gaskets?  All the gears and shafts seem to be ok.

I have had the truck for 66 years and maintained it fairly well and overhauled the engine myself about 30 years ago.  Never touched the trans.  The trans shop I recently took it to has it in pieces and says they can't find parts for it.

[Andydodge]

52 minutes ago, 54Dodgeguy said:

I did not find any topics like this on any forums, so here goes.  Can anyone help me find out when NP 420's were used in the C1-C8-116 Dodge trucks?

I have started rebuilding the 54 Dodge I have had since 1955.  Most of the parts are hard to find but I am getting there but the transmission looks like it will stop me in my tracks.

I want to keep it as original as I can, so I would like to keep the NP420, which is the transmission that I think is in it now.

Any help on where I can get parts for it; bearings, seals, gaskets?  All the gears and shafts seem to be ok.

I have had the truck for 66 years and maintained it fairly well and overhauled the engine myself about 30 years ago.  Never touched the trans.  The trans shop I recently took it to has it in pieces and says they can't find parts for it.

Have you asked this on the Pilothouse Truck side of the Forum?.....Welcome aboard from Oztralia............andyd

[46BulldogDodge]

Check out www.vintagepowerwagons.com   Go to 'Shopping' and choose 'Online Parts Catalog'.  Click on Group 7 Transmissions.   Scroll to p. 46 for exploded view and individual parts are on p. 47-49.  If you call them...1-641-472-4665...talk to Jenns.

 

Dick Hultman

Pittsburgh, PA

46 WC and 57 FFPW

[Bob Steele]

I've been swappin' out 3 on the trees with the 420's for years. I also  had problems finding parts. I'm told the 420 and 435 are nearly identical if that's any help. I found a 420  in a scrapyard some time back and had the Pistole Bros in So. Austin go thru it and THEY had a hard time gettin' parts! Good luck 'n never give up hope. -Bob in Baja So, Austin - 2 '63 TW's, '65 TW, '66 TP, . . . all still on the road

[Dodgeb4ya]

I have had many of those NP 420 transmissions in trucks I've owned.

They are pretty much bullet proof.

Maybe some new gaskets and a rear output shaft seal.

Gaskets might be hard to find.

I would not do anything more to it unless you had noise or grinding when shifting.

[tanda62]

 

Here is a link to some gasket sets for the M37.  I used these when I did my NP420 in my 53 B4C.

https://www.bigmikesmotorpool.com/collections/m37-parts/transmission-transfer-case-and-pto-parts

 

This page provides some information about the transmissions.

https://www.jobrated.com/tranmission-id.html

 

Hope this helps, Tom

[rustyzman]

I just rebuilt mine about 2 years ago, myself.  Lots of searching to get what I needed.

 

Vintage power wagons does have parts.

Ebay for various gears and bearings by mfr part number.

 

After bearings and a few gears, mine is much quieter and very smooth.

 

A factory parts manual would be a great help in your search.  A lot of items come up on ebay with the DCPD part numbers.

 

I skipped the gaskets and use 599 Grey / fujibond / hondabond.  No leaks whatsoever.  If you have a PTO on it, you will need gaskets to set gear lash, but those are standard gaskets.

 

I would suggest just getting the bearing sets from VPW, because they will get you correct parts the first time.  I had a few ebay ones that did not cross correctly and were wrong.  Give them a call and make sure they know the casting number and the application so they can help get what you need.  They have clutch sets as well.