Join Date: Sep 1999
Location: Vancouver, WA, near Portland, OR
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Re: gearing for an auto
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I currently have a 34:1 crawl ratio with my YJ. That is with 4.56 gears. I have the 999 auto and stock gears in my tcase. I think that my ratio is perfect. I wouldn't change a thing.
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Since your TF-999 final drive ratio is 1:1, your 60 mph engine rpms are 2697 with 35" tires. If you had 0.7:1 as do the 4L60E/700R4, then the rpms drop down to a rather unusable 1839, (might be okay for a V-8, but not for a V-6). To get the 6 cylinder engines to work well, 60 mph rpm's should be between 2,000 to 3,000, which in your case, your spot-on.