my 1991 buick lesabre custom's transmission is completely shot... wont shift from 1st to 2nd and slips in 3rd...

my car is a

1991 buick Lesabre custom 3800
VIN = 1G4HP54C1MH425195


my friend has a

1994 buick Regal custom with a locked up TPI 3800
VIN = 2G4WB15L7RI427198


her tranny is still good and shifting fine.... mine is not.... i was looking online supposedly mine has the 4T60 and hers has the 4T60-E....

though my 91 does not look the same as other 91's and does not have the same gauge cluster... i looked and her tranny has the same things on the front side...

will this be possible... is the tranny from this regal compatible with my lesabre custom?


my AIM = Guccimane407

Any help / advice would be Terrific as i need to do this swap this up coming weekend