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I realize this reply is pretty old but since the thread got bumped I just now saw it. This post is misleading in so many ways. You need to look at the SPID label in your glovebox for the transmission code as the light duty 5 speed will not have come in your 8 lug 2500. If there's one in there now, it's because someone swapped it in. 8 lug 2500's would only come with the heavy trans regardless of engine option.
Yeah dunno why people post confusing stuff like that other reply. NV4500 is not determined by what engine is in the truck; they absolutely without question came behind a large number of 5.7's. The engine is not the determining factor as to whether the truck came with the light or heavy manual trans. It's the tonnage of the truck. Anything lighter than an 8 lug came with the light duty trans unless specifically optioned for the heavy trans; anything 8 lug (or above like the 3500HD) came with the heavy trans and ONLY the heavy trans. Regardless of engine.
It could have been swapped with something else. I have the mw3 rpo code. I thought the NV4500 code was mt8.
Ok. Well looks like someone at some time tore the nv4500 up in mine a swaped in a 3500. I apologize for giving incorrect info.
