I picked up an 04 P71 with the tranny out and as I understand it this car has the 4R75W transmission in it that is used behind P71's, Mauraders & I believe the 5.4 in trucks. I can't find any 4R75W's near me in the P71 or maurader format, but there are a few GM 4R70W's near me that I can get pretty cheap. What do I need to do to make the 4R70W work in an 04 P71 as cheaply as possible? Or if I can find a truck 4R75W is that a direct swap in or will I have to change tail housings, converters ect.? Thank you all for any input!