Cant find where to fill datsun 120y gear box - Maxima Datsun Cars & Trucks

If you are talking of Voltage regulator, this thing is still enclosed with another metal box under the hood. This is based only on my first car 1978 Datsun 180B.You still have to open other metal box under the hood. Usually placed on the side near the fender. This should not be visible easily because of being a delicate electrical part. Hope you find it then

if the stick goes into the top of the box , pull the turret and fix the shift lever pivot
it the shifter is through linkage , fix the linkage where it has come off

If this is a manual / stick shift gear box it could be the 3rd gear synchronizing cone is worn out , you need to inspect and probably need to change it had this problem with my Nissan Datsun 120Y

first check to see if there is a white rectangle shaped ceramic box on firewall thats a resister went on mine drove to store came back out it wouldnt start common on the older datsuns

make sure transmission is in park loosen the linkage and adjust till shift lever is in park also and retighten

There is no stick to measure a gear box. You check it by removing the filler hole on the side of the transmission and sticking your finger down in it. Usually you fill it until it starts to drip out, then you know it's full.

80w90 for most older gearboxes rear ends etc

This sound like a timing issue, Check the points for proper gap, ck for proper timing, also ck the distributor shaft for looseness, or wabble, remove the cap and button and grab the shaft with your fingers and see if it moves back and forth, not in/out thats ok, but in a side to side type of movement. This can cause a missfire at hi rpm. 

try to check the bearing, sometimes they will fall out of place when you reinstall, that happen to me on a mustang. that may not be the problem but its a suggestion.

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