Heavy duty replacement. The original VW factory 3rd-4th slider hub is a known weak spot in 091 Bus and Vanagon transaxles. The Weddle HD slider hub is a heavy duty replacement designed to eliminate the breakage that is common with the original factory part. Weddle slider hubs are machined from ultra high quality steel and go through a multi-phase heat-treat process that greatly increases their durability. As a final step, all hubs are shot peened to increase surface strength and prevent cracks from forming.