[Ford46]

jimTN is on the mark, after sitting so long the leather cups in the rear end vacuum canister/cylinder have probably dried out. Remove the canister from the rear end, carefully remove the piston shaft with the leather cups from the cylinder and throughly soak in Marvel Mystery Oil. If leather should be pliable, if it is damaged damaged a rebuild kit can be obtained from John Connelly at Columbia Two Speed Parts, LLC in Arizona. Be sure the inside of cylinder/canister is clean and free of pits (this will create vacuum leaks). Parts are also available from John.


Testing instructions, with rear wheels off the floor, start engine, shift transmission into high gear and set hand throttle so speedometer registers 20mph. Now, without changing engine speed, shift into overdrive you should hear a click at the rear end. If equipped with the proper speedometer changer the speed reading will increase.


You are correct if it operates improperly catastrophic damage can occur. When operational they are the best accessory available on a stock vehicle. Any questions call John Connelly 951-719-4077 he was extremely helpful to me. LouB.