4.0 vehicle speed sensor

[kiragyu]

ok guys i was wondering how does an 06 ranger gets its speedometer reading. does it get it from a vss at the rear diff or does it get it from somewhere else i am so confused right now because i did an engine swap from a 98 mazda b3k to an 06 ranger 4.0 and my speedo is just bouncing and my 4x4 lights are flashing. i dont have abs so the abs light isnt on. i am thinking a sensor is bad but thats just me. any help would greatly be appreciated thanks