Clint Here is a picture taken back in 04 when I was doing some drive shaft work. The early model 1450 had a measurement of 18 5/8 inch and the later model 1650 had a measurement of 18 7/8 inches total length.
It's been a long time and I don't remember for sure but I think the 1450 had an indention in the rear on the drive shaft for a centering bearing and I don't think the later model 1650 had that.
Normally when I build a drive shaft I bolt the engine in the tractor and mount the couplers both front and rear and then take my measurement and cut the drive shaft to the correct length. I always use two rubber flex couplers front and rear and then they last forever. It may take a little extra time to mount the engine but then I get an exact measurement.
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