dogdart65
Member
I recently replaced my original 904 trans in my 74 Swinger after it started slipping on 2-3 shift , it had a B&M shift improver kit & TCI 2500 converter , otherwise stock 90K trans , worked great in that configuration for 4 years - over 100 passes till slipping started . Budget was tight so I just took out a trans from a 4 door Dart I had that my old lady wrecked . 80K miles , known to be good . I swapped the valve body & deep pan from the old trans , upgraded the converter to 3000 Hughes , & changed rear axle gears to 3.91 from 3.55 . The car responds great , 1-2 shift good , but it has a hard time shifting to 3rd . At first it wont shift at all , then after warm up driving , I can get it to shift to 3 with thottle playing , sometimes , then it seems to shift on its own sometimes after that , but sluggishly . Could the valve body be leaking ? or gummed ? Govenor problem ? my knowlege of auto trans is limited , so any help would be aprecieated