HPP IN TEXAS tuned The Car, I Wanted A #4 Lower To Accent My 2.76 Upper, With A Tune, And Going To Add A Killer Chiller. He Said It Is Proven, Do Not Do Lower Pulley, Bad Fir The Crank, Anyone Care To Enlighten Me?
It will overspin the upper as compared to stock, but isn't that the point? So long as you don't take the stock Eaton too high (I'd say above 15#'s), you'll be okay. I have used this chart so many times in the past few months, it's ridiculous. I had the hardest time pinning down what combo to run...I read also about overspinning the s/c when you add a lower pulley, will it be that serious?
That's what I was thinking. Difference from the 2.8 to 2.76 is small, if I would've gone with the 2.9, I would've done it together with a lower 4lb.I think a 2.76 and a 4# lower on a stock unit is overkill. I would stick to a stock lower with a 2.76 until you go port.
Manny stated that for a reason... Good luck.