4 Inch Filter Kit For 2 Inch And 7 Inch Sump
 
This filter kit if for Allsion 3000 and 4000 Series Transmissions with a 2" and 7" Sumps. It contains the gaskets and o-rings you need to change the filters.
 
Go to https://allisontransmission.com/parts-service/my-transmission and enter your Allison Serial Number. Group 16- will give you the Sump description for your transmission.