A 700R4 has a .30 OD ratio For the exact ratio take 70% of original ratio. This gives you the effect the OD has on your gear compared to 1 to 1 ratio in drive. I rounded off above 70% of 3.08is 2.16 a 4.10 = 2.87
Been there, Done that, Hope to live long enough to do it again.
Big Bill
I.I.# 4698
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