Whats the grub screw for in the pic??

[Peteolheadz100]

On his diff theres a screw 02099 part number whats that for?

 

[Phill2]

On his diff theres a screw 02099 part number whats that for?View attachment 14054

You take it out to remove/replace the pin in the drive cup.

 

[Peteolheadz100]

You take it out to remove/replace the pin in the drive cup.

Aahhh..ok i remember having to remove the lower sun gear and pass the pin with a needlenose through the drivecup back in the day when i use to race 1/10 scale

 

[Phill2]

Yep
Same thing