4l60e imput drum help

[Tony S]

This is the first transmission I've had apart an I've done pretty well besides this imput drum last weekend I assembled everything with all new parts then I air tested it an it was leaking air so I took it all back apart an check all the molded seals for tears everything looked good so I cleaned everything an reassembled with a homemade lip seal tool an air tested again it didn't leak at all so I left it on my bench all week and was gonna finish the transmission this weekend so I tested the drum one last time an it's leaking air again just the bottom hole which I think is the over run clutches ....it was really cold all week and my garage isn't heated maybe the seals shrunk from the cold? Any help would be great thanks