![]() ![]() Amsoil 75W-90 manual transmission fluid is a popular alternative that also meets the NV4500's fluid specifications at a much lower cost. The ACDelco oil is spec'd as a 75W-90, while the MOPAR fluid is spec'd as a 75W-85 both oils are the correct GL-4 lubricant developed for the NV4500. However, Chrysler and GM continue to offer their formulations, part numbers 12346190 (replaces 12346191) and 4874459 (replaces 4637579) respectively. The fluid has become difficult, if not impossible to source (no longer produced by Castrol?). The original fluid spec is Castrol Syntorq synthetic 75W-90 GL-4. Failure to use an acceptable fluid may ultimately result in excessive synchronizer wear and/or failure. The NV4500 features carbon fiber composite synchronizers and is therefore highly sensitive to transmission fluid type and viscosity. 10 spline, 1.25" input shaft for diesel and V-10 gas engine applications, 1.125" input shaft diameter for gas V-8 engine applications.Dual PTO provisions (passenger & driver side).Carbon fiber composite dual cone synchronizers. ![]() GM 12346190 synthetic 75W-85 GL-4 manual transmission fluid (supersedes GM 12346191)Īmsoil synthetic 75W-90 GL-4 manual transmission fluid MOPAR 4874459 synthetic 75W-85 GL-4 manual transmission fluid (supersedes MOPAR 4637579) Lubricants that meet the Syntorq spec include: ~ 4 quarts (1 gallon), fill to bottom of fill plug holeĬastrol Syntorq synthetic 75W-90 GL-4 or equivalent specification (details in next section below) ![]() New Venture Gear (formerly New Process Gear) ![]()
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