Originally Posted by gdw1963

And although the differential- and bevel gear looks alright at first sight, check the thoroughly. I suspect the bevel gear, otherwise as mentioned by .AJ check the pins from the centre driveshaft. If not lubricated properly the tend to push through the plastic retainer. That's why we use homemade aluminum sleeves but you can get commercial ones.

Originally Posted by .AJ.

The only time my XB4 has clicked is when the cvd pin in the front centre drive shaft popped throught the plastic retaining collar, it's worth checking all the cvd joints on the buggy