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Originally Posted by f5fstop
Every equation I have ever seen for a crawl ratio has never taken into account the torque converter. Reason is it is next to impossible since the converter slips at a different rate at different engine rpms. Therefore, the calculation would be next to impossible. You would have to figure out all the different rpms you would have in a given range.
All crawl ratios are figured without the torque converter taken into account by any manufacturer I have ever seen.
I have seen calculations for the H1, but it also takes into account the wheel multipliers too.
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as flywheel RPMs increase the torque converter is less and less efficient. The torque multiplication only occurs during a small RPM range on most small trucks due to many reasons. With electronics controlling lockup, along with the inefficiency of the converter itself, it's moot to consider it a factor for crawl ratio.
If one could effectively figure out the actual RPM range to hold the vehicle at and the electronics wasn't controlling the converter, you would burn the converter up and overheat the transmission.