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I too run the Goodyear Duratrac in 235/85-16. My 1028A1 also has the front LS diff. I keep all four of them at 85PSI because I haul and tow heavy loads with it. They work well for me in South Texas mud. At times I have needed to shift the tranny into 2nd gear with the shifter. This puts the tranny into 2nd to start and allows me to get enough wheel speed/spin to clean the tread. Other wise they can pack up and glaze over if there is enough clay in the mud.