depends on what transmission you have but yes you can do this in the drive way i am here to walk you through this i own a transmission shop so i can help the 4L60E transmission pan is like a square and the 4L80E is long rectangerler with like a rounded end at the mount side
yes the axle does have to come out and put the floor jack under the transmission pan have the car as high as posiable on a jack stand you might have to loosen the rack & Pinoin Bolt Also when all loose you will need to pry the frame down some and the cover will come out between the frame and body
what you have to do is drop the frame on the driverside all the bolts on the side cover are 13 mm but the bottom four or five are 40 torx i can do this job in about 1 to 2 hours if the side cover has a mount them are 15 mm it has to come off it take a little fanagleing to get the cove off but it...
the problem is mostlikely in the forward and direct drum assembly this transmission has a poor ground system and it will wipe out this drum assembly do to electrical current from the bronze bushing on a cast steel hub
there is a company called sw transmission they sell low milaged used transmission with a 1 year parts and labor warranty but i dont know a rebuilder in your area im in south carolina if you was closer id fix it for you.