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i would put the old 2 piece tail shaft back in. The single piece is designed for a gearbox with 2 main shaft bearings. like a T50 The 2 piece is designed for a gearbox with one main shaft bearing, hence the center bearing, carry's some of the load. like a K series. BUT, there is always a but, some japan KE70's had single piece shafts and a K series box. Also it could be the company who balance the shaft doesn't run the balancer flat out as well, i would only use Hardy Spicer in Brisbane, they know what our shafts go through.