[bigblockcoupe]

basically it boils down to which set of underdrives you get you can get a street set or a race set i would not use the race set on the street it is for cars running higher revs all the time like a drag or roadrace car the street sets are usually pretty liveable on the street i have had several cars with underdrives and have never really had any trouble with any of them they have always charged fine and ran cool