I have a rear and front main seal leaking on my Sentra. I go through a
lot of oil in two weeks, 1 to 2 quarts and I only drive in town! Well
I need to know a few things:

1) will I need a puller to remove the front main pully to change the
front main seal?

2) to change the rear main, can I pull the auto trans with out removing
the exhaust pipe connected to the engine and without removing the cross
member that runs under the oil pan? Also, any advice on how to go
about replacing both seals will be appreciated!