8-3/4 REAR AXLE SEAL INSTALL ??

I have installed the seals before I've just never had such a hard time doing it without crushing the seal. The ridge is about 3" inside the tube and I'm trying to get it seated there. I've worked around equipment for years and I know they sometimes freeze parts with liquid nitrogen to "shrink" them. Then install and when they warm back up they are seated and locked in. I just don't know what the "trick" is with this seal. I'm about $50 in seals and still don't have it fixed properly. 80-90w and drum brakes are not a good mix LOL