I bought a 96 olds cutlass supreme vin #1G3WH12M3TF360731 with a trashed 3.1-M motor and good 4T60E/M13 auto trans. I have the chance to purchase a rebuilt 3.1-J motor out of a 98 chev malibu which had a 4T40E/MN4 auto trans in it. Does anyone out there know i... Login to read more.