The problem with flex couplers for the Quietlines is the design of the metal couplers they bolt to, require a larger inner opening circle than the older model cubs used. This makes the newer flex couplers more prone to strech and break. Some Quietlines only have one coupler front and one rear, this along with more horse power, and the engine mounted on ISO rubbers puts a lot of stress on the flex couplers.
My answer to this was to use two flex couplers on the front and two on the rear. I use one of the new flex couplers to mount to the metal coupler and back that one up with one of the older flex coulpers with more material in the center. Together they are very strong. This requires making a shorter drive shaft and you need longer bolts for the flex couplers.
This drive shaft system seems to last forever. I do this to all of my Quietlines and also use the same system on my 782. I've never lost a coupler since doing this and I don't get the streching in the flex couplers.
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