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I have the NP435 and it works pretty well, although it is a truck transmission and shifts slowly and has less than optimal gear ratios. Like many others, I would like to have an o/d, but I'm put off by the cost of a NV4500 or a GV o/d. The option I'm now considering is a passenger car toploader with the truck-style tower shifter modification. No o/d, but better ratios and easier shifting.
Eric
The NV4500 is a 5 speed o/d trans used by GM and Dodge in recent years. The Gear Vendors o/d is an add-on unit that attaches to the rear of the transmission.
Eric