I realize this is an old thread, but felt I had some information to contribute for those who may be looking for more NV4500 information. From my understanding, the taller shift tower is from an 01+ NV4500, to accomodate
RPO HVY - 2" Body Raise: HD Model. The taller shift tower was to raise the shifter up to match.
EDIT: Of course, right after I post, I find Larry's thread from 2015 detailing the same thing. None-the-less, I'll leave it here in case folks stumble across this one instead.
From
https://core-shifters.com/pages/new-...gear-id#NV4500:
Quote:
Be aware though that for GM models of NV4500 there are two different lids - lid casting # 25137 for 1995-2000 and lid casting # 33893 for 2001-2007. The base mount for this later lid is 1/4" higher than earlier lid, requiring a deeper stub - i.e. each model requires a different shifter base. There is also risk of this taller lid being found on rebuilt Dodge units, meaning the original shifter base will not be compatible - so best to check the lid casting number (near front center of lid) when buying a shifter for any NV4500.
If you have an aftermarket lid with no numbers, it is almost certainly the shorter lid used by Dodge & early GM. We are reluctant to discuss stub depth here as it is hard to measure and easy to confuse but depth from flange face (w/ base gasket removed) to bottom of notch in rails would be ~ 1.75" for Dodge & early GM, 2.00" for late GM. This depth is best measured on the trans; to measure stub length on the base you must include the gasket to get the correct flange reference. Notice in the pic below the stock base housing remains the same for all years - only the stub length changes.
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