I just changed dip stick tubes from a Lokar to Hughes to cure a leak I've chased all over my tranny. First, thought it was the cooler lines, then the pan, then the gasket - and finally found the culprit. This was the 'improved' Lokar but the o rings still allowed a leak. Worse, I had put larger cross section o rings on but never tried the next size - which would probably worked. Someday maybe