Even a mild cam with 6X-4 Heads on a 455 with headers and free-flowing exhaust will make so much torque everywhere on the tach between idle and 4500, you’d never run out of smiles on the street with 3.73s.
By the time you freshen up that TH350 and add the cost of the Gear Vendors unit plus the shortened driveshaft, you really are knocking on the door of the cost of a nicely built 4L80E - which offers a bit deeper OD gear (.75) than the GV unit (.78). Most would tell you that a mildly built 4L80E will be stronger and more reliable than the TH350 with the GV unit. You also might find that the 455 makes so much torque that 3.42s offer plenty of gear reduction from a dig and will let the OD gear do you a bigger favor on the freeway than 3.73s would. Just a thought from having been there and done that.
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