Help!!!
Help!!!
Super Moderator
Joined: Apr 2004
Posts: 34,475
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Google, my man:
This might not be the exact one, but it's a place to start looking.
All I did was google "NP 435 rebuild" and this and a hundred more popped up.
http://broncograveyard.com/products/cat/13/16
This might not be the exact one, but it's a place to start looking.
All I did was google "NP 435 rebuild" and this and a hundred more popped up.
http://broncograveyard.com/products/cat/13/16
Senior User
Joined: Aug 2003
Posts: 127
Likes: 0
From: Layton UT
Bronco graveyard has the rebuild info and a great kit to overhaul it. Get the "master rebuild kit". It has new bearings, syncros, and seals, and everything to completly rebuild the trans (except new gears, but you shouldn't need them anyway).
The only trouble I had was the output shaft seal in the kit was for a 4WD, so I had to go to the local store and gear a 2WD seal. Other than that, the kit is great.
You will need an assortment of pullers and/or a press to change all the bearings. And DO change ALL the bearings, even if they look OK, change tham anyway. My trans howled badly and the bearings all LOOKED fine, but after changing them out, it is totally quiet now. Take your time and it is pretty simple.
Here is the link to the manual on that trans. It is a PDF file, so you may need Adobe Acrobat.
http://broncohq.com/pdf/66-77/chassis/435rebuild.pdf
The only trouble I had was the output shaft seal in the kit was for a 4WD, so I had to go to the local store and gear a 2WD seal. Other than that, the kit is great.
You will need an assortment of pullers and/or a press to change all the bearings. And DO change ALL the bearings, even if they look OK, change tham anyway. My trans howled badly and the bearings all LOOKED fine, but after changing them out, it is totally quiet now. Take your time and it is pretty simple.
Here is the link to the manual on that trans. It is a PDF file, so you may need Adobe Acrobat.
http://broncohq.com/pdf/66-77/chassis/435rebuild.pdf
Last edited by Big Dave; Jan 8, 2005 at 12:32 AM.
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Mountain Pass
Joined: Sep 2004
Posts: 240
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From: Gurnee, IL
Big Dave - This site was very helpful. The kit I bought to overhaul the trans is a universal kit for my application as well as others. My problem now is that I am not sure which gaskets to use for my trans. The kit comes with 3 or 4 different input shaft gaskets. Any more info for me? Thanks.
Bill
Bill
Senior User
Joined: Aug 2003
Posts: 127
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From: Layton UT
Read the assembly instructions thoroughly. Those gaskets should all be different thicknesses. This is how you set the endplay/backlash on the input shaft. Before you pull the trans apart, you should notice a little bit of side to side movement in the input shaft. This is normal, as long as it isn't excessive. When you put it back together, you'll have to try different gaskets to get the correct amount of backlash. It is actually pretty easy, if the gasket is too thin, the input shaft will be hard to turn and you will feel the gears meshing unevenly, too thick and it will have to much side to side movement and may even touch the throwout bearing guide.
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Mountain Pass
Joined: Sep 2004
Posts: 240
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From: Gurnee, IL
the tranny overhaul is going well, except for losing one of the two flat springs that go in between the first gear and the second gear brake. Any ideas where I can find one of these springs? Thanks.
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Mountain Pass
Joined: Sep 2004
Posts: 240
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From: Gurnee, IL
Big Dave - Here I am again, bugging you about this tranny overhaul. I found the a site for the springs and just received them yesterday. The only problem now is I can't figure out how these things go in. According to the diagram I have they drop down in the teeth of the out put shaft between 1st gear and 2nd gear synchro. If I put them there it won't let 1st gear slide over the 2nd gear synchro. Is this right? Also what keeps them in there if 1st gear slides all the way to the back of the trans, these will fall out. I have been looking for a more illustrated drawing for the installation of these springs, but can't seem to find one. Any help you can offer would be greatly appreciated. Thanks.
Bill
Bill
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Joined: Aug 2003
Posts: 127
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From: Layton UT
I am looking at a picture of the exploded view and I seem to remember that those go in special grooves in the output shaft and the first gear slides over and until the output shaft is back in and mated to the input shaft the those things will want to slide out of place. I think the first speed gear stop holds in the one side and the other side is held in by second gear.
frankly I don't know what those things do, but I don't remember having a hard time figuring out where they went, I remember it was tricky to get them in there (need 3 hands). Do you have a camera? send me some pics to davidwilburn at earthlink dot net and i'll try to help you out.
Dave
frankly I don't know what those things do, but I don't remember having a hard time figuring out where they went, I remember it was tricky to get them in there (need 3 hands). Do you have a camera? send me some pics to davidwilburn at earthlink dot net and i'll try to help you out.
Dave
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Mountain Pass
Joined: Sep 2004
Posts: 240
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From: Gurnee, IL
Well after looking at everything about a hundred times, it looks like two of the grooves on 1st gear opposite of each other are a little wider than the rest. So I think that they sit inside of those grooves and then 1st gear gets put on the output shaft with them in place. It looks like they keep tension against the output shaft so that 1st gear doesn't slide all over the place. Let me know if this sounds right to you. Thanks Dave.
Bill
Bill
Senior User
Joined: Aug 2003
Posts: 127
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From: Layton UT
I just remembered that I took a few pics of the inside of my transmission as Iwas taking it apart to help me in the reassembly. The drawing is confusing because it shows the bent down part of those springs facing IN toward the shaft when they actually face OUT and lock themselves onto the gear itself so they can't move. Slide the gear on the output shaft without the springs installed and hold it up to the light and there should be two splines that have a gap in them - those are where you put the springs. I just can't remember if they go on opposite sides of the gear or not. Now that I think about it, I seem to recall that those things actually straddle one spline and face away from each other. But when you hold it up with the gear on the shaft, it should be apparent they they will ony fit one way. When you figure it out, put the springs in the gear with some grease to help hold them and then slide the gear with the springs on the shaft. If you have to force it, something is wrong.
I hope I didn't confuse you even more. Take you time and you'll get it.
Dave
I hope I didn't confuse you even more. Take you time and you'll get it.
Dave
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