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2001 4r100 fresh rebuild , no 2nd to 3rd shift ( just replaced shift valve), about to order solenoid pack, here to make sure this is a PWM solenoid pack that i need, not a NON PWM. have a new OSS and VSS installed , ordered ISS. When unplugged it does go into 4th gear safe mode. im believeing it is electrical, thanks, for everyones help, ROnjon