A replacement for a the Syncro speedometer drive gear inside the front differential. Standard for all American vans with the 4.86 ring and pinion. Any Syncro that uses the 19 tooth gear should be compatible, 8:19 ratio.
This gear is fabricated with nylon alloy for durability, chemical resistance, and heat tolerance.
Install using your original drive shaft by heating the shaft to 400deg F and inserting into the new gear. Please be sure the shaft, speedo cable, and speedometer turn smoothly before installation.