Switching to a 4 speed (How Difficult)

[sleepychallenger]

just a small block bell with 5.20[od] bearing retainer hole. the OD brg retainer can be cut down to 4.80 to fit the smaller bel

if you get ahold of brewers they can get you a bell with the 5.20 or 4.80 retainer hole. i had my big block bell made with the small block retainer size.

[challenger_73]

Can anyone tell me if the bearing Retainer can be cut down to fit the 1970 -71 bellhousing (4.346)

[Changin Gears]

Can anyone tell me if the bearing Retainer can be cut down to fit the 1970 -71 bellhousing (4.346)

That can't be done, what can be done though is to put the gears in another case that has the correct size bearing.  You can also get rid of the floating countershaft pin by doing this.