SLOW shifting, with throttle down, and once clutch is pressed, don't release till done with shifter movemnt. This is after stopping tractor guess should stay. Once clutch is out and gears moving again, even in Nuet,, it will want to grind some. Best to have tractor completely stopped to pick a gear. YOU CAN'T shift on fly like a car/truck. Sure clutch is releasing all the way?
ON the trans, the stock ones did not have a rear seal on back bearing or front either. If oil was splashing around or too full it could slowly leak out thru back bearing and down the tubes and eventually back to rear-end and even the bull gears, making them ALL too full after a long time. There is only a thin paper gasket at the tube ends and it isn't much. As noted should not be much oil ere anyway. Oil also can leak past the brake shaft seals and get on those and cause no stopping. I believe in Lucas more than STP and also don't believe in FULL STP only, but use half gear oil 80 wt, and then the Additive. 8 oz is the amount, do NOT fill till it runs out the level plug, that is too much. Only way to open this system up IS to pull engine loose and seperate at clutch housing or end of trans by pulling engine ahead. Most tins will have to come off to do this and see the driveline also. If you get really into it, could but new bearings with sealed sides in the tranny's to keep it all in there better. Good Luck!
Edited by glgrumpy, September 28, 2015 - 02:55 PM.