I've been working on getting the NV4500 rebuilt, and converted to 4wd. I just finished assembling the back side of the new fully splined 4wd mainshaft and went to install the rear bearing expecting it to be "tight" and the bearing fell into place!!

I measured my old 2wd mainshaft where the bearing sat and it measure out to 1.877". The new mainshaft bearing surface measures 1.874" and the ID of the new bearing is 1.875".

Anyone else run into this issue before? And any suggestions on what I can do to fix this issue...or should I try and get a replacement mainshaft from the company I bought it from....I bought it months and months ago so I'm sure there will be no warranty, or exchange.

 

I would replace it. I think it will only cause problems. If the bearing race is compressed by a nut or something than .001 is probably okay. But if it is meant to be a press fit then I say return it.

 

OK I think things might be usable as they are? I was looking, and thinking about things and noticed that the 5th gear rides against the inner shell of the bearing.





Once the nut on the 5th gear is torqued to 250 ft/lbs it should lock that inner shell in place.

Thoughts?

 

That is kind of how I want things to go...but it all depends on if I can get a warranty on it or not. If not do you think my post above would be a viable alternative?

 

I got a response from the company I bought the upgraded mainshaft from...Here's their reply.

So I guess it's good to go.

 

Yes, good to go. Since the nuts compresses the bearing race the race cannot move once the nut is tightened. Always good to hear that the manufacturer will respond to an inquiry with a knowledgeable answer.

 

Only issue I see with this is that you can't properly set your main shaft end play unless this bearing is torqued down with the 5th gear nut.

Since there is a thrust washer beneath the bearing that needs to be compressed tight, and the other components on the mainshaft that might shift and move once under the load from the 5th gear nut.

 

I would not be happy with a floating bearing. Would suggest loctite 620 bearing retaining compound.

 

Good call

 

Can you put the nut on it to set the endplay? It would not have to be real tight for setting purposes.