I have a 1975 1650 Quietline with the 44" deck and the only issue I've had with tall grass/weeds is weeds getting caught in the belt and prematurely wearing it out. I have started using SPZ2000 belts on the mower for the heavier/taller grass on my 10acres. Make sure you adjust your belt before you start and about 30 mins in to eliminate any slack. Slipping has never been an issue for me as I keep a 1/2in wrench on the mower to do the belt adjustment.
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