Traxxas 4425 - 45-Tooth Diff Gear (For 4420 Ball Diff.) by Traxxas $13.50 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Traxxas 4425 - 45-Tooth Diff Gear (For 4420 Ball Diff.)Brand: TraxxasPart Number: 4425Replacement or upgrade part for these Traxxas models: