Shop now for Mainshaft Nuts and Washers for your 1992-2007 GM NV4500 5 Speed Manual Transmission. We have an extensive stock of NV4500 Small Parts, so we probably have that pesky little part you need to complete your NV4500 repair or service job.
The infamous "NV4500 5th Gear Failure" is almost always wrongly blamed on the nut. Having your nut back off is a consequence of an inadequately supported mainshaft 5th gear on stock and full spline mainshafts. Radial and axial movement of the gear will loosen the nut. No nut design will prevent 5th gear failures although they may delay them. The only way to solve the problem is to redesign the shaft, gear, and nut set which we did with now out of production Torque King® mainshaft sets. See Tech Article 5th Gear Failures and Solutions for more information.
