trans question

I was mistaken then, looking at it now and with the info above I can see that the parts truck has the 904 and the new truck the 727.

Stupid question maybe but I dont suppose its as easy as buying the kit and installing to go thru the bad trans?

Coming up with tools are not an issue for me but maybe there are highly special tools needed? ( that I am sure I do not have ) Maybe there are things to know/look out for that a novice like myself would not know?