There is no shims to reduce the backlash in a diff. The backlash comes from incorrect thrust washes behind the side gears . They wear and allow the tooth clearance to become excessive . Using new washes will bring the backlash back into specs.. Check bushes in the gears and shaft condition that the gears are mounted on.
SOURCE: Transmission trouble on 2002 Ford E-450 Super Duty
Hi, this is a defective OD shift solenoid that is located inside the trans pan. you will have to drop this pan in order to extract it for replacement. this solenoid, if damaged, cant initiate the shift sequence required for the OD to engage during operational procedures.
Simply replacing this solenoid will fix this issue.
NOw, concerning the erratic shifts. this is isolated within the transmission control module. it seems to be malfunctioning. you will need to replace this module as well.
SOURCE: Need to get a fuse diagram for my 1999 e-450 super duty RV.
http://i28.photobucket.com/albums/c216/thomaspedemon/exm01108.gif
here ya go
SOURCE: need to know how to replace parking brake shoes on
Best thing to do is buy a repair manual for it at your local AP store and read up on the details.
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