GMC Truck Transmission Gear Selector

1996 Gmc 4x4 With 5.7 Just Put In New Transmission And New Shifter Cable,,,i'm Having A Hard Time Shifting Down And It Won't Shift Up??? Any...

After The Truck Warms Up. The Speedometer And Tachometer Zeros Out. And It Won't Go Into Overdrive, Or It Does Want To Down Shift. I...