Ok I have examined my machine and have found the problem -it was my sprockets being bad-The chain broke-got wrapped around the rear axle sprocket and frame and jammed into the metal frame-this I believe caused the front chain to brake get wrapped around the center sprocket then yanked the t20 down -anyway the chains all did brake at the master link.My plan is to buy new weld a hub sprockets and weld them to the old sprockets -using the old sprocket as a hub after cutting it down-Has anyone done this?-I dont want to sound like a hack but I just dont have the cash for new original max sprocket with hub assemblys-I will need to get 8 sprockets -I am going to add inner axle flange bearings also- Kicking myself for not doing this 2 years ago when I did the frame transplant and new outer bearings but I was in a big hurry to get it done and drive it-just to see if the project would work-I really would like to upgrade to #50 sprockets and chain but then I wonder if that might lead to the shear bolts in the axles breaking.-