Dec 13, 2015 #1 patches05 Junior Member Joined Dec 13, 2015 Posts 8 Reaction score 0 Location Pampa Tex First Name Omar Truck Year 1988 Truck Model V30 CREW CAB 4x4 Single wheel Engine Size 350TBI sm465 dana60 14 bolt rear 4.56 gears Any one use the GEAR VENDORS under/overdrive on their 4speed manual 4x4