This is a Baldwin BT839 used on an Allison AT545 automatic transmission in a school bus. According to records that came with the vehicle, this filter was installed in 2003, and stayed in service for about 40,000 miles until recently.
Looks like the typical clutch material found in the pan of transmissions that have no external filter.
Thick coil spring and a one piece bottom cap.
Thick gasket for the top seal. Still soft and pliable.
Pleats are a little curvy where they bonded the ends of the media.
Pleat spacing is OK otherwise.
Some destruction. Looks like a well made filter and I didn't find any holes or tears in the media.
Overall it seems to have lasted well, considering 16 years and 40K miles.
Looks like the typical clutch material found in the pan of transmissions that have no external filter.
Thick coil spring and a one piece bottom cap.
Thick gasket for the top seal. Still soft and pliable.
Pleats are a little curvy where they bonded the ends of the media.
Pleat spacing is OK otherwise.
Some destruction. Looks like a well made filter and I didn't find any holes or tears in the media.
Overall it seems to have lasted well, considering 16 years and 40K miles.