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Old 04-09-2021, 09:33 AM
goatwgn goatwgn is offline
Ultimate Warrior
 
Join Date: May 2010
Location: Chesapeake Va.
Posts: 1,387
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A '67 GTO TH400 should shift fast already. When it is rebuilt, the modulator should be replaced with one of the small units with the red stripe on it, and be adjusted in for the quickest shift. Upgrade the clutch packs, and have a 4l80 roller sprag installed.