Haven't run into that problem before. Have had issues with the ID hole of the seal being too small and quickly getting destroyed after fitment.
What brand seals are they? Personally I recommend the NAK brand units.
For fitment I usually use the extension bar and an appropriate sized socket from my 3/4" set. I lightly grease the recieving part of the diff housing, and seal. I also grease the spring of the seal up to help it stay in place during fitment (hasn't actually been an issue I've experienced but was recommended to me years ago and I've stuck with it). I then carefully tuck the lip into the socket gap, and tap it into place.


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