The reply was something to the effect of, “What’d you do, drop it on the ground?” I presume she had little solace with that reply, but she bravely continued on in 4th gear and we all eventually arrived at school. One morning, when she was unable to force the transmission into fifth gear, she radioed the school that I lost 5th gear.
#Chevy nv4500 driver#
We had a lady bus driver who was a chronic gear grinder. I was riding to school on a Brockway school bus. Vibration and cyclic loads are the main causes of fretting.Įvery time someone tells me I lost 5th gear, I am reminded of an occurrence in my youth. What you see is actually oxidized metal particles worn from the gear and shaft. Note the reddish/orange sludge discoloring the shaft. Typical 5th gear failure on a stock NV4500HD transmission. Now, you’re wondering if you are going to make it home and how much this will cost you to fix. You mutter, “Oh no, I lost fifth gear!” Just back into fourth and away you go. Your blood pressure lowers a bit and you try to upshift to 5th. Your truck responds instantly as power is returned to the rear axle. You step on the accelerator to resume speed and the engine races, but your transmission is no longer transmitting power! White-faced and shocked, you mutter what the #%!! as you check to make sure the shifter is still in fifth, then downshift to fourth and let the clutch out. You are driving happily along in 5th gear, either you (or your cruise control) lets off on the accelerator for a moment. This failure usually occurs without warning or noise. In the classic case, the nut retaining the mainshaft fifth gear backs off allowing the gear to slide back in the transmission extension housing and out of contact with the countershaft 5th gear. See our NV4500 Web Pages for current mainshaft choices:Īlmost all cases of mainshaft fifth gear failure can be directly attributed to insufficient support for the 5th gear. The facts presented in this article are still valid today, however, due to the advancing age of the affected trucks, we no longer offer the expense to make Torque King Mainshaft and RetroFit Kits mentioned below. So, exactly what is the problem, and what is being done about it?Ģ019 NOTE: This article was originally written in 2005 when the last Cummins-powered truck built with the NV4500HD was only 1 year old. The problem has been experienced with both General Motors trucks using the 6.5l V8 Diesel and Dodge trucks with the 5.9l inline 6 cylinder Cummins Diesel engine. Owners of diesel trucks equipped with NV4500 5-speed transmissions have been looking for a cure for 5th gear failures from as early as 1993.
#Chevy nv4500 full#
Why Stock and Full Spline NV4500 Mainshafts Fail
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