[bigm71]

I have heard changing the gears in the rear affects the stall point of a torque converter. Is that true? How much? It would seem to me that if the gear is easier to turn (higher #ed gears) it would move the stall point lower and vise versa. Right?

[cindys_sn95]

you are correct. it all depends on the converter. if its a stock converter it won't change much.

[dtuna42]

I have never heard that.... I am not enough of an expert to tell you that you are definately wrong - but according to what I do know about how trannies, converters, and/or gears work, I see absolutely no relationship between converter lock-up speed & rear gear ratio.
If there is some kind of relationship there, please explain it to me.

[bigm71]

Its an aftermarket 2200-2800 converter. Weight of the vehicle, gear ratio, etc. definitely effect the converter. That's why they are rated in a range like 2200-2800. Depending on setup you can change the point to some degree. I was just wondering if it went up or down when the gear goes up or down. When you order a converter they usually ask you all those questions with engine specs to build you the right one. I'm pretty sure the heavier the car the farther it stalls so I'm guessing the larger the gear ( lower the number ) the same.

[Dana W]

Takes less torque to get the bigger gear to turn, thus less hydraulic presure for the converter to lock up. I don't think they actually physically lock up anyway, just at a certain amount of fluid pressure the output shaft begins to move. Kinda like two propellers in a tube of oil, one drives the oil and one is driven by it, or am I oversimplifying the mechanics. Is there a mechanical lock-up in a torque converter?

[Player]

As I understand it, there is not a mechanical "lock-up" on older torque converters. Some newer cars do actually "lock" though, to improve gas mileage.