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General Discussion
Th400 upgrades
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<blockquote data-quote="tallnate" data-source="post: 730880" data-attributes="member: 3217"><p>I ran a fairly built 400 in my prior rig for about 8 years and never had a failure. I'd say definitely upgrade to the big sprag. I'm no transmission builder so I can't attest to which upgrades are more important than others but here's the list of upgrades mine had. </p><p></p><p>High pressure valve body.</p><p>~Billet intermediate shaft.</p><p>~Billet input shaft & drum assembly.</p><p>~Roller bearing thrust.</p><p>~Forward & direct 7X7 clutch packs.</p><p>~Reinforced five pack intermediate clutch.</p><p>~Modified direct drum with heavy duty 36 element sprag that is 3 times larger than the 34 element sprag.</p><p>~Billet steel forward hub.</p><p>~Deep aluminum pan kit.</p><p>~475 Heavy duty spiral lock case trimmed for clearance. (case was trimmed for clearance so that 4l80e bands could be installed because they're supposedly a lot beefier than th400 bands)</p></blockquote><p></p>
[QUOTE="tallnate, post: 730880, member: 3217"] I ran a fairly built 400 in my prior rig for about 8 years and never had a failure. I'd say definitely upgrade to the big sprag. I'm no transmission builder so I can't attest to which upgrades are more important than others but here's the list of upgrades mine had. High pressure valve body. ~Billet intermediate shaft. ~Billet input shaft & drum assembly. ~Roller bearing thrust. ~Forward & direct 7X7 clutch packs. ~Reinforced five pack intermediate clutch. ~Modified direct drum with heavy duty 36 element sprag that is 3 times larger than the 34 element sprag. ~Billet steel forward hub. ~Deep aluminum pan kit. ~475 Heavy duty spiral lock case trimmed for clearance. (case was trimmed for clearance so that 4l80e bands could be installed because they're supposedly a lot beefier than th400 bands) [/QUOTE]
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