So I will need to tear apart my NV4500 and replace the syncros because it grinds when I shift into second gear. If I double clutch then I can shift with out grinding gears, but trying to down shift is difficult, so I am planning on tearing it down to replace the syncros, just wondering if I should have any other parts handy to replace since it is opened up? It seems to be fine otherwise, no whining, the gear shifter is tight and it does not seem to leak any fluids. I do not know if it has the fifth gear fix or not? Thanks for any insight.

I'd replace the main bearings while you're tearing it apart. At least the front one. And the input shaft seal.As long as you don't need to remove the countershaft for anything, I'd just check the teeth and such on it. 5th gear nut, output shaft seal, etc.. they're not that much $ but well worth not having to pull the trans again because they started leaking. :banghead:trust me, I know.

This is why I am asking, so I do not have to be :banghead: a month after I get it back in. I would rather only have to pull the trans once than have to pull the trans twice, I do most of my own work, but it is still the time and effort to do it I might as well do it only once.

I'd replace the main bearings while you're tearing it apart. At least the front one. And the input shaft seal. As long as you don't need to remove the countershaft for anything, I'd just check the teeth and such on it. 5th gear nut, output shaft seal, etc.. they're not that much $ but well worth not having to pull the trans again because they started leaking. :banghead: trust me, I know.

I got most of my stuff from quad4x4.com, but I'm sure someone here may have another (better?) solution for parts.

Yea id say quad4x4 like Rogan said or Pure Diesel Power as far as parts. http://www.puredieselpower.com/catalog/nv4500-parts-c-29_66_68_272_281.html -Jordan-

If you need the 5th gear fix this looks good to me but have not tried it myself http://fifthgearrepair.com/index.html

If you need the 5th gear fix this looks good to me but have not tried it myself http://fifthgearrepair.com/index.html

I just tack-welded the locknut to the gear and called it done. 3 yrs running and it's still snug as a bug.