That's the same thing I have been kicking around. I did find that at 65 mph with a 27" tire 3.73's run 3098 RPM and 3.42's run at 2841 RPM. I feel that this is not TOO much of a difference. I think i'm going with the 3.73's and start looking for a 700R4. Then maybe 4.10's 
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Gary -1986 SWB: lowered 4/6, SOLD!!!
-Best 1/4 mile: 14.51 @ 91.01 MPH
-2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!!
-2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels
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