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99 RT 5.9 ex cab truck and my problem must be a easy one as normal to almost hard full throttle the transmission shifts fine. At a stop and you punch it the truck will take off like a bat out of hell and go to redline and a little above but wont shift into second. then the computer kicks in and shuts off the fuel so you dont blow the engine. Soon as the engine RPM drops the engine comes to life again, keep your foot in it and it will do it again. you ease up just so slightly and the transmission shifts to second and shifts fine after. No check engine or transmission light so does anyone have any ideas?
 

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It sounds like you're trying to shift against the rev limiter. Instead of trying to shift past redline, shift just before,

BTW there is no need to shift at redline, by then, your engine is out of it's power band

Ed
 
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