Hi guys, I've always wondered if the $60.00 to $100.00 cost of 12 quarts of Synthetic automatic trans fluid was worth the invesment. Has anyone out there had a positive experience with syntheic ATF for there 4R70W or AOD trans? I've been told that it could be worth up to 1.5 tenthes in the 1/4 mile. What are your thoughts. Also can someone tell me what the first gear ratio is in a 4R70W?