Quote:
Originally Posted by 93 Krawler
We were talking about transmissions at Windrock. The gearing drop on your 2nd to 3rd is crazy. You need a gear between them. 2nd is too high and 3rd is too low. That's why launching is hard to do. Food for thought...
SM465 - Case length - 12"
First - 6.55:1
Second - 3.58:1
Third - 1.70:1
Fourth - 1.00:1
Reverse - 6.09:1
TH350 - Case length - 21 3/4"
1st - 2.52 : 1
2nd - 1.52 : 1
3rd - 1.00 : 1
Reverse - 2.07 : 1
TH400 - Case length - 24 3/8"
1st - 2.48 : 1
2nd - 1.48 : 1
3rd - 1.00 : 1
R - 2.07 : 1
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Keep in mind that it's not really apples to apples when looking at the ratios between an auto and manual transmission. You need to factor in the torque converter ratio. In general you typically at least double the ratio, meaning that the TH350 or TH400 is closer to a 5:1 ratio. The way I always explain it is you get a much broader range of ratios (i.e. wheel speed) from just one gear in the transmission because of how the torque converter varies.....from a start/launch you get the 5:1 crawling ability but can then seamlessly get a the wheel speed of the 2.5:1 gearing with no shifting at all. Of course on top of that the auto can even upshift into a higher gear in a middle of an obstacle without losing all of your momentum and engine rpm.