Only have 1st and 2nd Gear
 

98 Blazer 4x4. Pulled codes saying solenoids and rear speed sensor was bad. I next checked the fuses, ICM and finally dropped pan and tested solenoids. Bothed pulled 23 ohms dead on the money. Put back together after changing gasket, filter, and fluid. Put on computer and now its only showing the speed sensor. Any ideas bc Im at a lost. Oh, no metal shavings or anything in pan, harnesses and wires r good. Can the speed sensor cause this? PLEASE NEED HELP BAD. I have a disabled father that lives with me so I cant be without a vehicle.

now the only code I have is a p0300 random misfire that's been there for a few months (and I haven't touched it yet) bc I need to change my plugs and wires.