lightning engine into a 02 FX4 SCREW
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Joined: May 2006
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From: Iowa
Shift kit is worthless on the 4r70w, you need to use custom tuning of the transmission to take advantage of the power. Shift kits in these transmissions dont have the same effect that the shift kits in the old turbo 350's and 400's. But yes you need to help the tranny out a bit
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