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post #1 of (permalink) Old 06-06-2000, 08:08 PM
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np435 mainshaft swap

Any info on the dificulty and general guidance about swapping the gears/synchros on the mainshaft.I'm thinking about doing it myself and saving the $200 or so that it would cost to have done.The tranny shop that did it for me initialy makes me wonder.It has a cracked little ring that is just inside the case on the output end.I'm not sure what you call it.I've discovered that it's cheaper to buy a whole new tranny and swap the shaft than it is to get this one redone,provided that I can do it myself.Any help is greatly appreciated.

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post #2 of (permalink) Old 06-06-2000, 09:32 PM
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Re: np435 mainshaft swap

Go for it! I did mine on the front porch . I was worrieid about doing it. I could not find any books on it. So I just tore into it . Stack the pieces like they come off. YOU CAN DO IT !

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post #3 of (permalink) Old 06-06-2000, 09:49 PM
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Re: np435 mainshaft swap

It doesn't require any special tools I take it.Abuddy gave me a two page picture/diagram when I first got the tranny.He copied them from a service manual of some sort.I am not in possession of feeler gauges right now,do I need to worry about clearances between the gears or do they pretty much taake care of themselves.

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post #4 of (permalink) Old 06-06-2000, 10:36 PM
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Re: np435 mainshaft swap

I went to the library and made copies of the different manuals. I was surprised at what one lacked in detail the other had. It was not a problem. In fact, if you are having the famous "walk out of granny" problem, now would be a great time to contact AA and arrange to swap for a new shaft. It seems that for years, the shafts were going out not in tolerence. Thus causing the "walk out of granny" problem. Well, I have just replaced mine, and all the tests that I have run it through so far has been without a hitch. What a shame that the NP-435 rep has been tarnished because of this, but it will make those trannies more available for those of us in the know.

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post #5 of (permalink) Old 06-07-2000, 03:58 PM
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Re: np435 mainshaft swap

In talking with Lloyd Novak (before he passed on), I learned that some NP435's have a shallow detent for first gear and some have a deep one. The shallow ones are prone to walking out of granny more than the deep ones. Seems that NP didn't really intend for the trannies to spend a lot of time in low gear. Just enough to get that load moving and then a shift to 2nd. So in some of them, they didn't drill the detent in the shift rod very deep. That makes it easier to make the 1-2 shift. Sometimes it makes it so easy that it will make half of the shift on its own. It's pretty simple to pull out the shift rod and grind the 1st gear detent to the same depth as the 2nd gear one.

FWIW, mine is fine without the grinding. Don't know if mine is the deep detent or not.

Jason '87YJ
(350/NP435/D300twinstick/SOA/GM14-FF-Detroit/D44-Lock-Right/M8274)
post #6 of (permalink) Old 06-07-2000, 08:09 PM
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Re: np435 mainshaft swap

Just an update;I picked up another tranny today from a salvage yard for $75.I'm going to start to take both of them apart tommorrow and work on putting mine back together in operational condition.I've never done tranny work before but I have faith that the jeep gods will smile on my venture.Later,james

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