Quick Tansmission help!!!!

Hey i have a HUGE question and i have a very limited amount fo time to figure out I have a 1989 Z24 with a 2.8 and 3speed my engine blew and tranny slips But i now have a 3.1 and 4 speed Problem ismy Z24 had a square Transmission Plug on the front my 4 speed has a round one Is there ANY chance they could AT ALL work togeather? or can i splice em and rig it to work? and also not a big question but curious is my shifter gonna be compatable? all i got on my shifter is 1-2-D and my cutlass that the 4spd is out of is 1-2-3-D So ANY Advice will help i dont care what ya got to say i just need some ideas

Thank Alot
Dave

The square plug is there for a reason. It is so you cant plug the wrong one in :P.
So heres the dealie.
The computer in the car is basically what tells it to shift gears. With the origional transmission being a 3 speed, the computer will only recognize it as a 3 speed transmission, and only shift until it reaches 3rd gear (which means you will not get to 4th). In order to fix that, you must replace the computer with one that uses a 4 speed transmission.