The National 99139 Crankshaft Repair Sleeve is a direct replacement for Volkswagen Jetta models from 1994 to 2005. It is designed to repair the crankshaft and is compatible with 4WD vehicles with a new process 243D series transfer case. This repair sleeve is made by National, a well-known brand in the automotive industry. The other part number for this product is 6232652448. The product name is Crankshaft Repair Sleeve, and it falls under the category of engine parts.