The trans wasn't that big of a deal at all and I got forced into doing it at the same time the new motor went in.
Once I found that the hard parts to fix my 904 and rebuild it was almost exactly the same cost as buying a used 1995 42RH OD and a shift kit I didn't hesitate much. :D
Once the 8.25 Cherokee rear end goes in that will bring the gearing down some, but holy crap this thing is fun to drive.
As a matter of fact I have a service call I have to go on, so I have to go drive it again right now.