I have a 1999 Dodge 3/4 ton 5.9L Diesel 4WDQuestion:  I was driving home from work yesterday and all of a sudden 3rd was gone. It trys  holding when I first put it in 3rd but then pops out and nothing. It still shifts into all gears fine.  1st also pops out if I don't hold it in. Any thoughts on what happened? 2nd, fourth, and fifth shift in and hold fine. If I try and hold it into 3rd it will catch and then slip and then catch a second and then slip again. I'm kinda confused. Any thoughts would be appreciated.Answer:  From you description of the problem it sounds like the output shaft is moving from maybe bearing failure?  1^st and 3^rd are both a forward shift but they are not on the same rail… 3^rd gear is an issue for the NV4500 and always has beenWe would suggest you purchase the following parts:

• Bearing Overhaul Kit all Dodge up to 1996 part number MWT308 your cost is $110.98
• Syncro Ring Kit uses a reverse syncro in the dodge part number MWTRK4500 your cost is $225.00
• ¾ Shift fork our part number RS334843 your cost $25.85
• 3^rd Gear on the Main Shaft 29 tooth 5.61 ratio our part number MWTNV23712 your cost $97.97
• ¾ Hub & Slider Kit our part number MWTNV18422 your cost is $173.33, plus S&H.

This is a list of what should be required for the overhaul if once you have it a part and need additional parts give us a call toll free 888-824-2012, you can see the other parts available for your NV4500 on our site.