Speedometer gear transfer case

[Dlowe]

Speedo doesn't work correctly. New speedo gauge and cable so I've pulled the rear section off the Transfer Case . The gear that the cable slips into is metal and in perfect condition. The plastic gear that fits over the output shaft looks perfect as well but will travel 2" back and forth on the shaft. In the middle there is a hatched area in which I would think this gear should fit tight and not move? Advise please. Should I use some type of lock tight? Thanks

 

[Dlowe]

So I took the output shaft out, cleaned it up, etched the inside of the plastic gear and used an epoxy, lightly coated the hatched area and inside the plastic gear. Put it all back together after a long cure time and it works perfect. If the gear oil doesn't affect the epoxy it's a done deal.