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Shop now for Parts and Manuals specific to 1972-1991 Dodge trucks equipped with New Process NP435 or NP445 4 Speed Manual Transmissions. Most items in stock for quick shipping.
The primary heavy-duty 4 speed manual transmission used in 1972-1991 Dodge full size 1/2 ton to 1 ton trucks was the wide-ratio (6.69:1) New Process NP435 which is only synchronized for 2nd, 3rd, and 4th gears. For the 1972-1979 model years, an optional, close ratio (4.56:1) heavy-duty New Process NP445 (Often tagged as Model 4530 or NP4530) transmission which is fully synchronized in all forward gears was available. The NP435 and NP445 both have a direct drive 1:1 4th gear.
The two transmissions are externally similar and they do share some common parts, but most components are not interchangeable between the 2 models. We stock bearings, seals, and some hard parts for both these transmissions. For synchros, shafts and gearing, the availability of most parts for the NP435 is getting tighter every day, but we can usually supply most parts you might need. The NP445 is another story, due to it's age and low production numbers, major parts for the NP445 are mostly unavailable.
The NP435 was replaced after the 1992 model year by the 5 speed New Venture NV4500 transmission with overdrive.
