First rule is to pick a transmission that suits your input torque, available traction, and max rpm requirements. Reply with those details to get a proper transmission assessment. In the case of the 6L's you will also need to consider fabrication capabilities as well as your tolerance for troubleshooting. 6L adaptation is in its infancy.
Nothing wrong with a Gear Vendor OD other than added cost, weight and complexity. They're popularity increased at a time when OE overdrive transmissions were not available. They can be somewhat redundant when applied to a 4L80E or other OD trans.
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Steve Chryssos
Ridetech.com
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