use the c-4. theyre better for racing. they dont run out of gear quicker.noone has ever had a problem with a c-4 and thats why theyre used in pro 5.0 cars. all trannies have a final drive of 1:1 except od or stick which have 1:1 in 4th gear. unless you plan on using 4.56 gears you wount have a prob on the street.
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