Eaton Posi limited-slip differential for the GM 10.5 in. 10-bolt axle with 30-spline gears, ratios of 4.10 and lower. A quality petroleum-mineral-based, GL5-rated 80W-90 gear oil should be used, and a four-ounce bottle of friction modifier should be added for optimum performance if the gear oil doesn't already contain one.
Eaton Posi limited-slip differential for the GM 10.5 in. 10-bolt axle with 30-spline gears, ratios of 4.10 and lower. A quality petroleum-mineral-based, GL5-rated 80W-90 gear oil should be used, and a four-ounce bottle of friction modifier should be added for optimum performance if the gear oil doesn't already contain one.