Quote from: "Crosley"bolt in sprag race has been around for years...
sprag holds in low gear,
usually when the race , sprag , rollers are destroyed in low gear with the shifter in "D" the rear band is not applied.
in "1 " on the shifter, the rear band is applied to aid in holding power to the sprag
Except with most reverse pattern valve bodies. A&A and a few others now make a rear band apply valve body to help. Another thing to be very aware of when using a valve body that does NOT have rear band apply,is that when the sprag "rolls over" or rips out of the case, the front drum will overspeed to 2.5 times engine speed,which results in some very nasty carnage if your running a STOCK front drum.
Check out this thread from another board.
http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Board=Racer&Number=4782213&page=0&fpart=all