833 manual to 904 automatic questions

Don't quit thinking. you'll need the correct kick down linkage . If the Aspen still has it on there , better get it also. Maybe the drive shaft too. Not sure if they would be the same.
Trans cross member and mount might be different to.
I have the linkage all setup. I noticed that there is a electrical plug that comes off the side of the transmission on it though and I’m not sure what it’s for exactly....