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Originally Posted by BonzoHansen
As I have been told, the rule of thumb is to keep 1st Gear X Rear Gear between 10 and 11 (at least for street cars). Higher than 11 and 1st gear is pretty useless, lower and you don’t have enough gear, I guess causing tuning and clutch issues. I suppose this also assumes normal height street tires, not giant slicks. Super tall tires would likely alter the decision process – and I don’t know drag racing needs enough to comment. So based on that, here is the range you might look at:
2.66 x 4.56 = 12.1
2.66 x 4.11 = 10.9 <--in range
2.66 x 3.90 = 10.4 <--in range
2.66 x 3.73 = 9.9 <--in range
2.66 x 3.42 = 9.1
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Wow if you are right, I get a little nervous about the trans going in the chevelle with a 3.42 first gear ratio
3.42x4.10=14.02