39 Tranny troubles

[solidaxle]

I rebuilt the tranny 2000 miles ago. Replaced everything worn, new synchros, C-clips, trust washers, springs and inserts, coutershaft B-7111R, front grease seal. Rebuilt the shifter with new balls and springs. All under the guidance of Van Pelts book.


Filled with 90W GL-1 oil.


Everything was running smooth until now. On occasion it will grid while just driving along and is a little resistant at times to shift into 3rd.


I drained the tranny and the oil has a green tint, luckily no shaving or metal chunks were found. I discovered my universal housing is loosing the JD corn head grease and it is migrating into the tranny.



I'm suspect the contamination of grease is the problem. What do you guys think?