With an S400 on a 5.9 I wouldn't want anything tighter than a stock converter, even then it shouldn't puke smoke before it lights with good tuning.
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1995 RCLB 4x4: H-pump, 5x.012s, HX35
2001 RCLB 4x4: H-pump, 6x.013s, S472/S488
EdzGarage, Matt's Diesel Supply, HTS Transmissions
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