Fits: 1994-2005 Dodge Ram 2500 & 3500 The New-Venture 4500 5-speed transmission has been a great workhorse for the Dodge Ram trucks. Unfortunately, the models designed for 4wd/4x4 operation have a common design flaw with the 5th-gear set-up. The lock nut which secures the 5th-gear assembly to the main shaft will vibrate loose over time and allow the 5th-gear assembly to works its way off the splines of the shaft, and no longer mesh with the companion gear. This causes the loss of use for 5th-gear, and can also cause significant damage to the transmission's mainshaft, resulting in very costly repairs. Common symptoms for the early stages of 5th-hear lock-nut failure include but are not limited to; excess transmission noise (especially in 5th-gear), jumpy/jerky 5th-gear driving, difficulty with engaging 5th-gear and or grinding when entering 5th-gear. Later stages may be as severe as complete loss of 5th-gear functionality, almost seeming as if you've shifted into neutral instead. If your truck is suffering from any of these symptoms, this may be the fix you need!