gears and syncronizer assemblies and synco rings. Maybe/probably more stuff. Input, 2nd, 3rd, 4th, and syncro assy. Check prices at http://www.passonperformance.com ...about $800 to $900 for just part alone! Will not make any money switching them over. You will probably loose money. Sell it like it is.
Doctor Diff wrote: "I run across them occasionally. I bought a couple cheap, just to get the cluster gears. "
So I think the only guts that are really in common are the cluster gears.
If it ran good in your buddies challenger why is he getting rid of it?