1/7 UDR rear straight axle short card modification and upgrade parts metal differential steel teeth steel teeth metal parts

The BRC upgraded UDR differential steel material uses chrome-molybdenum-titanium 20, heat treatment up to 55 degrees, so that the gears have higher strength and higher toughness, thereby largely eliminating the possibility of tooth sweeping, 0 degree spiral arc teeth The unique design makes the gears run more quietly and smoothly, and at the same time increases the strength. All are born for crazy UDRs, so let your UDRs run with confidence from now on! This price is the price of half a car, please indicate before and after when you take the picture, please take 2 copies for one car