How to determine the needed stall speed?

well this where i fit the stereotype mentioned in this thread several times. I cheaped out getting my magnum swap together.

The converter is a low mileage PTC i got from a member on here for 200 bucks. I'm not sure on the size, but the member stated it "flashed to 3k"(looking back at the PM), so it may be lower than a 3k stall, which now has me worried that maybe my transmission is in way worse condition than i thought. If the converter isnt a 3k stall then my 3rd gear is badly slipping on the highway. Because past threads& discussion have felt that my highway rpm's at 65mph were about on target for 3.55 gears and a 3k stall converter.


The converter will slip going down the highway, and will always feel loose, hence the need for a nice big trans cooler. That's just the way it goes with looser converters, and the size does matter. An 11" converter will (usually) feel looser than a 9.5" converter set to stall at 3000.