Overfilled the transmission oil on a D6N LPG and the plug is stripped

There’s a D8T breather being washed out at Christmas this year.I do them when tranny oil gets changed.
The earlier D8K’s and H’s had them stuffed under the fuel tank at the back.
They were designed perfectly to be burried in layers of dust in the summer,that would get muddy in the rain,then dry out to a nice concrete.
In those days I only cleaned them out when I adjusted the brakes and found them there!!
These days,I’ve learned to read the operators manual!

Sorry,wrong pic

Not sure what’s going on here with the pics.
I’ve definitely not tried to post all those pics.
But you get the jyst of the little breather things.It doesn’t take a lot to block them and even less to clean them

Yeah, I was going to say that D8T ain't gonna push much with those semi-smooth tires on it...
When I was a young'un I worked for a man who absolutely insisted any truck or machine that came through the shop had as a minimum all axle and tranny breathers wiped with a rag, or whatever was needed. He would randomly check behind you, and said it had really cut down on seal replacements over his career.