Why do you want to run one of those power robbing turbo 400 trannies in a Mopar?  Hmmm......I only know of 2 mopars that have done that swap. Both cars were big tyre chassis cars and they both improved ET with no other changes. But....was it down to a better converter.... or the more efficient 2-3 gear change All I know is a TH400 and a 9" are both considered options on my long term upgrade list  . The Reid case is another nice option you cant get for a 727. Indeed, the SFi case is another advantage. After reading another post on how some manufacturers are discontinuing parts for Dana 60's, I think fitting a 9" has moved to the short term upgrade list 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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