TH400 rebuild tech

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-More to follow as I finish this build.
-I will cover intermediate clutch installation, direct drum assembly, forward drum assembly, pump inspection and assembly, air checks, dual feeding modifications, 34 element intermediate sprag vs. stock 16 element and later roller clutch as well as various assembly tips to improve the TH400.
-OK,
-Making your own valve body kit.
-The TH400 doesn't require anything super fancy to get a firm shifting unit.
-You need to drill the feed holes shown in this picture. I recommend drilling them both to .125". The 3rd feed hole can go bigger, but I would recommend .140" as the high end.
 You also block the 2-3 accumulator feed hole in the valve body. This requires a 5/16" set screw and proper tap. You will remove the 2-3 accumulator piston, discard the spring.
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 What this does is eliminates accumulator function on the 2-3 shift. This results in a very positive 2-3 shift. You could leave 2-3 accumulator function in place and go slightly bigger on the feed hole.
+===Check ball locations===
+Install 5 check balls in the locations marked in red X.
+[[file:T-400checkballs.jpg]]

Revision as of 21:10, 28 January 2011