nilknarf007 Posted July 19, 2021 Share Posted July 19, 2021 Apologies if there is already a thread for this, but I couldn't find it. I know that YOU can probably rebuild the 435, the question is, can I? The only two things I haven't tackled on a vehicle is an engine rebuild and a tranny rebuild. I'm curious as to how difficult it is, and what special tools I will need. I replaced my clutch a few months ago, and I noticed I had quite a bit of slop in the input shaft, but things were running fine so I didn't worry about it. Now I have a significant rear main seal leak, so I'm going to have to pull the trans out again. I'm thinking I might as well rebuild it while I have it out to fix the slop. It has 140k on it, and 110k of that is from the original owner. I'm sure it's possible to just replace the front bearing, but I want to do all I can while I have it out of the truck. Is this something a shade tree mechanic can do? Any recommendations on rebuild kits? Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 19, 2021 Share Posted July 19, 2021 I haven't rebuilt an NP435, but you can look at the factory shop manual on it here: Documentation/Driveline/Transmissions/Manual Transmissions/NP435. Link to comment Share on other sites More sharing options...
nilknarf007 Posted July 19, 2021 Author Share Posted July 19, 2021 I haven't rebuilt an NP435, but you can look at the factory shop manual on it here: Documentation/Driveline/Transmissions/Manual Transmissions/NP435. I think my eyes started to bleed about halfway through that read. But, I think it can be done. I guess I'll take a ton of pictures during disassembly and give it go. Link to comment Share on other sites More sharing options...
Dyn Blin Posted July 20, 2021 Share Posted July 20, 2021 I think my eyes started to bleed about halfway through that read. But, I think it can be done. I guess I'll take a ton of pictures during disassembly and give it go. Novak has a lot of good resources to plumb: https://www.novak-adapt.com/catalog/transmission/transmission-parts/np435-parts And a helpful set of notes here: https://www.motortrend.com/how-to/np-435-rebuild/ Nice folks, too. Offered a lot of help to a friend working on a Jeep T90 last year. Link to comment Share on other sites More sharing options...
StraightSix Posted July 20, 2021 Share Posted July 20, 2021 Novak has a lot of good resources to plumb: https://www.novak-adapt.com/catalog/transmission/transmission-parts/np435-parts And a helpful set of notes here: https://www.motortrend.com/how-to/np-435-rebuild/ Nice folks, too. Offered a lot of help to a friend working on a Jeep T90 last year. Im planning to rebuild mine in the next few weeks and my buddy and I rebuilt his in November. Im fairly confident itll go without a hitch. it would be really nice to have a second set of eyes on it when you do it! If you can build an axle or a transfer case Im sure you can do this. you will need a press, a set of calipers, standard shop tools, and nothing else really special comes to mind tool wise. I was "in the passenger seat" as "shop help" for his rebuild, but as far as I remember there is only one terribly critical measurement in the 3rd/4rth synchro area, and it does need to be right. If you cant get it to shift gears on the bench and get both the input and output shaft to spin, dont put it in the truck. he made that mistake of thinking the synchros were just too tight from being new (wouldnt shift on the bench) and he thought speed on the input shaft would help. that turned out to be incorrect. We pulled it out again and got that one critical measurement right and after that it was all smooth going. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted July 20, 2021 Share Posted July 20, 2021 Im planning to rebuild mine in the next few weeks and my buddy and I rebuilt his in November. Im fairly confident itll go without a hitch. it would be really nice to have a second set of eyes on it when you do it! If you can build an axle or a transfer case Im sure you can do this. you will need a press, a set of calipers, standard shop tools, and nothing else really special comes to mind tool wise. I was "in the passenger seat" as "shop help" for his rebuild, but as far as I remember there is only one terribly critical measurement in the 3rd/4rth synchro area, and it does need to be right. If you cant get it to shift gears on the bench and get both the input and output shaft to spin, dont put it in the truck. he made that mistake of thinking the synchros were just too tight from being new (wouldnt shift on the bench) and he thought speed on the input shaft would help. that turned out to be incorrect. We pulled it out again and got that one critical measurement right and after that it was all smooth going. Don't forget a good set of snap ring pliers. When I was stuck up in Vermont a year ago with a smoked transfer case I couldn't find anything that worked, locally. Chain auto parts and hardware stores had nothing available. Fortunately Amazon delivers Knipex, and I was able to get some in a day or two. I haven't been inside a NP gearbox but if it is anything like the T-19 I had good pliers are going to save you a lot of headache. Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 20, 2021 Share Posted July 20, 2021 Don't forget a good set of snap ring pliers. Amen, brother! I struggled for decades with the one-size-fits-all (but never fits anything) snap ring plier sets. The ones with the little hex-shaped inserts that turn, or flex, or break. I finally bought the KNIPEX Tools 00 20 04 SB, Precision Circlip Snap-Ring Pliers 8-Piece Set and love them. Link to comment Share on other sites More sharing options...
nilknarf007 Posted July 20, 2021 Author Share Posted July 20, 2021 Don't forget a good set of snap ring pliers. Amen, brother! I struggled for decades with the one-size-fits-all (but never fits anything) snap ring plier sets. The ones with the little hex-shaped inserts that turn, or flex, or break. I finally bought the KNIPEX Tools 00 20 04 SB, Precision Circlip Snap-Ring Pliers 8-Piece Set and love them. Thank you all so much. I feel a cautious optimism that I can do this. Ordering the pliers now.... Link to comment Share on other sites More sharing options...
cjstaci Posted July 24, 2021 Share Posted July 24, 2021 Thank you all so much. I feel a cautious optimism that I can do this. Ordering the pliers now.... I used to work at UPS. We had NP 435 and NP 465 back then. The NP 435 is an easy rebuild. You should be able to buy a small parts kit along with blocking rings and bearings. I would look for SKF or Timkin depending on where they are made. Link to comment Share on other sites More sharing options...
nilknarf007 Posted July 25, 2021 Author Share Posted July 25, 2021 I used to work at UPS. We had NP 435 and NP 465 back then. The NP 435 is an easy rebuild. You should be able to buy a small parts kit along with blocking rings and bearings. I would look for SKF or Timkin depending on where they are made. Are you talking about the kits themselves or the bearings? Link to comment Share on other sites More sharing options...
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