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Idahome
Joined: Wed May 2nd, 2018
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4r55e biggest issue is leaky separator gaskets
but can lead to bigger issues
Sounds like you have a converter lock up OR line pressure issue
Have you tried scanning live data to see what the PCM is commanding and when?
Check for manufacture specific (trans) codes?
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks