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Proto Max(TM) metal knuckle couplers
Reliable planetary gear differential
Pro-Line engineers made sure to carry over all the things from the original that made it the most popular and loved upgrade to your Slash® 2wd while making it even stronger and more capable of handling today's extreme power systems
They reviewed numerous photos of damage to stock A-arms to see where the weak points were
Low friction belt driven 4wd system
Proto 1000 920-8173 HO Scale EMD F3A Pennsylvania PRR 9508 - NOS Era_1923 + Proto Max(TM) metal knuckle couplersProto 1000 920 8173 HO Scale EMD F3A Pennsylvania PRR 9508 NOS (New Old Stock) HO Scale EMD F3A Pennsylvania PRR 9508 Note: The axles have been replace with new Athearn wheelsets. NOTE: NOS (New Old Stock) USED items are as is and not returnable. If you have any questions please ask before purchasing.