mhutchen@kcbx.net Posted August 19, 2016 Report Share Posted August 19, 2016 A previous owner changed out the 3-speed column shift with a 4-speed on the floor. I am trying to figure out which transmission it is, so I can get a seal and gasket kit for it. It's a synchro 4-speed (3rd and 4th only). The number cast into the side of the case is C88221, and the date above that is 3-29-51. I've been looking at trans stuff on the Power Wagon site, and it looks a lot like the C88671. If that gasket and seal set would fit mine, life would be wonderful. Based on what I have read in the various topics, it looks like I also need to make a custom gasket to fit the front of the tranny, but I'm pretty sure the leak is from the rear seal. How it can leak from above the oil fill plug is beyond me, but... Thanks in advance. Oh, my truck is a 1949 B1B X truck, but heaven only knows what the tranny came out of. Hutch Quote Link to comment Share on other sites More sharing options...
JBNeal Posted August 20, 2016 Report Share Posted August 20, 2016 ya might want to consider the skf speedi sleeve for that output shaft so the new oil seal will work better...small grooves can wear in almost every shaft surface on these old beasts, rendering a new oil seal a little weepy 1 Quote Link to comment Share on other sites More sharing options...
Paul Beard Posted August 30, 2016 Report Share Posted August 30, 2016 I don't if this helps but my 4 speed is the same and it is a New Process trans. 1 Quote Link to comment Share on other sites More sharing options...
Big50Dodge Posted August 31, 2016 Report Share Posted August 31, 2016 On 8/19/2016 at 6:10 PM, mhutchen@kcbx.net said: A previous owner changed out the 3-speed column shift with a 4-speed on the floor. I am trying to figure out which transmission it is, so I can get a seal and gasket kit for it. It's a synchro 4-speed (3rd and 4th only). The number cast into the side of the case is C88221, and the date above that is 3-29-51. I've been looking at trans stuff on the Power Wagon site, and it looks a lot like the C88671. If that gasket and seal set would fit mine, life would be wonderful. Based on what I have read in the various topics, it looks like I also need to make a custom gasket to fit the front of the tranny, but I'm pretty sure the leak is from the rear seal. How it can leak from above the oil fill plug is beyond me, but... Thanks in advance. Oh, my truck is a 1949 B1B X truck, but heaven only knows what the tranny came out of. Hutch Not sure you will like my answer, but I found the same issue when trying to identify, then swap my non-syncro trans to a syncro unit. My trans pops out of gear once In a while and it would be easier and cheaper to get a used one than to rebuild this one (and still end up with a non-syncro transmission). My application might be slightly larger than yours however. What I did was start searching the web for my particular transmission - I tried to identify the case, and then the numbers. I did all that a while ago, but I did come across a wonderful site that had all sorts of information on the various transmissions and even likely vehicles to find them in. Ahh, that was a while ago as I say.. best I can tell you now, is do the same thing - start scouring the internet looking at photo's and typing in your tansmission numbers. Here is one for Borg Warners http://www.novak-adapt.com/knowledge/transmissions/manual/t18-t19 Here's another with good verbage, but no photo;s http://www.rsgear.com/technical/diagrams/transmission-articles/domestic-truck-transmission-identification-guide.aspx#New_Process_435 Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted August 31, 2016 Report Share Posted August 31, 2016 It's a New Process model 420 syncro trans... drain plug sticks out parallel to bottom of the case. 1 Quote Link to comment Share on other sites More sharing options...
TGP Posted August 31, 2016 Report Share Posted August 31, 2016 It looks like NP420 (early) This site might help and he has all parts and very Knowledgeable Dave Cirillo DC Truck Parts .http://www.jobrated.com/tranmission-id.html Tom 1 Quote Link to comment Share on other sites More sharing options...
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