We spin our engines pretty fast and don't have any issues with those couplers. I've had the same one in my puller for probably 15 years and develop close to 60 ft lbs of torque spinning the driveline in the 6 to 7500 rpm range the majority of the time. I've seen no signs of wear on the input or the driveshaft. I do know people that have used u joints but only because they built very flexible chassis and were getting allot of twist. my frame when I first built the tractor flexed about 2.25 inchs with no driveline issues. in a previous tractor I ran 2.5 inchs. they can twist a fair amount without problems but you will at a certain point get some binding that will pull the motor down when it starts to bind up. I run a solid front axle witch magnifys the twist vs a pivoting front axle.
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