The TRF421 gear differential unit set can be used to replace a worn-out part for the TRF421X (Item 42391) or used as an upgrade to the standard TRF421 (item 42384).
Product Details
In The Box
Gear Differential Set1
The TRF421 gear differential unit set can be used to replace a worn-out part for the TRF421X (Item 42391) or used as an upgrade to the standard TRF421 (item 42384).
Product Details
In The Box
Gear Differential Set1