4.08 or 3.90 gear questions...

SS_Firehawk

Big thing to keep in mind with gears, especially 4.08's is your gearing for and against you. At speeds over 90mph, you'd be in the same gears for a shorter amount of time. There would be 10, 14, and 18mph per gear that you are sacrificing to the next higher gear. For At those periods, the 3.69 will be more beneficial. The only way to get around this is compensate by rpm. So 4.08's really make sense if you can rev the engine to 8000-8250rpm. That implies that you have more aggressive cams, oil pump gears, ad damper at a minimum. It would also be recommended to replace your rod bolts and look into running a slightly stiffer valve spring on the VVEL side to prevent spring attenuation. That would make for a pretty Nasty NA Z, but costly. Anything over 8500 would need a new rotating assembly too.

On the track, 4.08's can be great for pulling out of a corner, but a PITA on the straights or high speed turn where you find yourself between the right gears.

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