its a single axle ! I decided to go another direction. The Toro Flow engine research i have been doing and information from other folks has been interesting. I believe i will stay away from this one. Have been looking for a coe. Found one close by within 2 miles of my house. (talk about right on your door step) that fits my wallet and my eye. I find that is the best way to keep my interest in projects. If you are interested in the 51 GMC Call: Lonne at 801-330-0731, He has many other big bolts as well as some older 1/2s