4.57 would be the 3/4T ratio, and that'd have 8 lug wheels, not likely in a burb unless someone swapped it out in the past, standard 1/2T would be 3.90, or 4.11 if it originally had the OD .... you can find the actual ratio by jacking up one rear wheel, chalk mark the tire and drive shaft, turn the wheel 2 full turns, count the turns of the drive shaft, or turn the drive shaft, count the wheel revs, multiply or divide by 2
Bill
