You can make a 727 or 904 a two speed with a CRT 2nd gear launch trans brake valve body for a lot less then converting to a pg.  This is exactly what I intend to do soon. The 1.45 gear will be soft for something not making a lot of power though. For what a bulletproof glide will cost me for my car, I'll try one of Cope's transbrakes first.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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