i need the mechanical speedo gear for either a 2wd w56 or w55 manual trans. the part where your mechanical speedometer cable plugs into the tranny. the 4x4 ones will not work on the 2wd they are alot narrower. i think any of the 2wd w series will work but not sure i put the one from my original w42 in my 5 speed and it worked for a while.