there are 4 different transmissions available in a '71 Charger: 3-spd manual/4-spd manual/904 automatic/727 automatic
there are 4 different rear differentials available in a '71 Charger: 7-1/4" * 8-1/4" * 8-3/4" * 9-3/4"
there are 2 different u-joints available in a '71 Charger: 7260 (2-1/8" inside yoke) & 7290 (2-5/8" inside yoke)
so there are quite a few STOCK combinations available
1971 Charger with 727 & 8-3/4" rear axle & "big" u-joints should be
Hollander interchange lists (no transmission reference):
8-1/4" rear axle - & 8-3/4" rear axle -
***** #2996 101 - 50-11/16" lg. x 3-1/4" dia. (7290 u-joints & 2-5/8" inside yoke)
GG's "white book" shows:
8-3/4" rear axle - w/both transmissions
***** #2996 101 - 50.68" lg. x 3-1/4" dia. (7290 u-joints & 2-5/8" inside yoke)
