Also known as: nv4500, nv-4500, new venture 4500
The heavy-duty five-speed manual in the three-quarter and one-ton American pickups — the Silverado and Sierra, the Tahoe and Yukon.
It is the NV3500's big brother and shares its most consequential quirk: it takes a specific lubricant. The NV4500 wants a 75W-85 GL-4 gear oil, and a conventional GL-5 hypoid oil attacks the brass synchro rings — the additives that protect a hypoid differential are what destroy them. A gearbox that has started grinding into second and third within a year of a fluid change has usually had the wrong oil put in it.
Its characteristic mechanical failure is the fifth-gear nut backing off. Fifth sits on the end of the mainshaft, retained by a nut that works loose; the gear then walks and the transmission loses fifth alone while every other gear works. That combination is close to diagnostic — no other common fault takes exactly one overdrive gear — and there is a well-known updated nut for it.
Beyond those it is a very strong gearbox, which is why it is a common swap behind engines making far more torque than any factory application.
Cars fitted with this gearbox
5 generations. Only where a source names the model and the generation together — a gearbox is documented as a product far more often than as a fitment, so this list is deliberately shorter than the truth.
Chevrolet
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