Product Description TKR5075 – Diff Coupler (lightened, hardened steel) Front and rear diff coupler replacement for all versions of the EB48, NB48, ET48 and NT48 vehicles. This diff coupler is also used on the Tekno RC V4 kits. It installs on the rear diff and accepts the Tekno RC V4 Drive Axles (dog bones, TKR450113R, TKR450513R, TKR450613R, TKR450713R, TKR450913R). Hardened steel construction and lightened. Build Note: Use thread locking compound and verify the set screw is keyed with the slot on the diff pinion (TKR5152, TKR5405). Vehicle Compatibility TKR5075 - Diff Coupler (lightened, hardened steel) is included with the EB48.2, EB48.3, EB48.4, ET48, ET48.3, MT410, NB48, NB48.3, NB48.4, NT48, NT48.3 and V4 Conversions kits and can be used as a replacement part for those vehicles. This item is not directly compatible with other vehicles as it could have different geometry or require additional parts. Please use the instruction manual from the kit(s) listed above to verify can work with your vehicle before purchasing.