actually the 3.90s are too tall for my combo.The 4.56s were great but with the 3.27 first gear I was getting no pull in first.Im putting in a 4.30 in the next few weeks.If I was to do it over,I would opt for the TKO 600 with the taller first gear,a 4.30-4.56 rear and the .67OD.Remember,4.56s with the TKO is like 3.08s in 5th.My cam really does not allow me to drive in 5th gear under 2000RPMs.Tom
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