[factorystock]

Like all upgrades, it usually boils down to cost, the reason most of these older trucks don't have these upgrades already. The gear vendors in an excellent unit, but it will cost around 3K+ new. Don't know the price on a good used GV for a 465 Chevy trans. A used NV 4500 is around 1.5K, don't know the price for a new NV 4500. As I mentioned earlier, your lucky to get this truck free to offset the cost of an expensive upgrade. I would seriously look at Lockdoc thread on his NV 4500 conversion, it probably the most cost effective conversion. Jocko pointed out something interesting, the GV overdrive is .78 and the NV overdrive is .73. The NV will get your rpms down a little lower.