<VV> PG Question

[Smitty]

Smitty Says;   How deep do you want to go with the answer Andy?  The 
shortest route/ quick and dirty answer is, they can be swapped with nothing 
more than a TV lever change.  Once you get beyond that then things get 
interesting.  The PG went through developmental changes from day one right 
through to at least the intro of the 140 engine.  Mods to alow oil coolers 
required internal changes.  Concerns about internal air required anti 
cavitation valves etc.  The biggest change in my estimation was in 64 when 
the internal pressures were raised to handle the increased torque of the 164 
engine.  Of course the higher rpm torque curve of the 140 required a 
different governer so it could shift later. The list goes on and on..  If it 
would ease anyones mind any I have to say that I have used trannys from the 
earliest to the latest in my wagon and brutalized them pulling the camper up 
mountains and across deserts with no change but an oil cooler and never had 
a failure that couldn't be blamed on my squirrly desire to use the last inch 
of value from a part before letting it go.