Hi,  I am in the process of getting my Mercomatic rebuilt and was wondering about the best transmission fluid to use.  I started out in the old tranny with dextron and it seemed to be OK, but someone told me it should be type F, so I changed it to this and it started blowing by the seals and low and behold, starting slipping bad until warmed up for 5 min.  The transmission had not been rebuilt before but I had it on the bench and cleaned it, etc, and made the mistake of not having it rebuilt.  I want to be sure of the fluid so please offer your info.  Thanks