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OK Last week i had my NP435 oil changed. I couldn't do it because i couldn't get the damn drain plug loose and i stripped it trying. So i took it to a shop and the guy got the plug out and fixed the plug for me.
He filled it from where the shifter is. He used my 75w90 Redline oil i had. The problem i am having now is its grinding 2nd gear if i try to downshift at all. It only does this if i've driven it for a while and i am wondering if he accidently hit one of the sliders inside out of position before installing the shifter would that cause it to grind? It never has done this before and i have used Redline before as well.

Thanks,

Cobra
 

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I doubt it is related to what he did.
the stick pushes on rails IIRC
nothing near a syncro
try matching rpm when downshifting to make the rebuilt box last longer
 

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drain and refill with 85w140 and forget about it till the bearings are toasted. your syncro is getting worn out.
 
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