Crawl ratio

[93hummer]

Good stuff, this is input I was looking for. I was thinking the torque converter would affect it somehow.

Torque converter effect is huge.... For a manual I would want no lower than 80:1, but that would be way overkill for an automatic. For an Automatic I would go no more than 50:1.

I used to have a YJ with a 3.8 atlas, T-18, 3.73's, 38 boggers and the crawl ratio was around 89:1; more gear than I ever needed. I actually stalled it in 4 Low 3rd one day in the mud, tried to take off in second, stalled again, put her down in first and tried it again and it snapped a front D44 shaft and smoked the centerforce clutch.... too much gear will break things. Just for laughs one day I went across the parking lot at 4 wheel parts in Atlanta in RWD low, 1st gear on the T-18, doing about 5 MPH at about 5000 RPM..... lot's of people looking wide eyed.