My Low Cab Forward also has factory roller bearings, I totally cleaned the old grease out of them and re-packed with modern disc brake wheel bearing grease and new seals, no issues at this point and I use the truck.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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