Sounds more like a 4.10 gear, with about ~300rpm of converter slip.
If you have a high RPM stall converter though, it could be 3.73 with 550rpm of converter slip... hope you have a big trans cooler if that's the case.
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Derek Kiefer, member of Minnesota's Northstar Chevelle Club
69 Malibu Pro-Touring - 69 SS396 3spd - 23 Model T roadster pickup
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