6743A 5TH Gear Locknut Wrench 6743 Alt
Used on heavy duty models with 29 and 31 spline shafts. Use 6443 on standard duty models with 23 and 30 spline shafts.
This special wrench is used to remove and install the output shaft 5th gear locknut in NV4500 and NV4500 HD manual transmissions.