Your "stall" speed is the maximum engine rpm attainable with the trans in gear, and the output shaft stationary (brakes on, wheels not
rotating). If it is higher that rated, the trans is slipping, lower could be engine tune, ect.
Originally Posted by onovakind67
If you have a 700R4 it will lock the converter in OD, and this negates any slip in the converter, resulting in a 2500 stall converter acting exactly like the stock one.
This actually makes the converter like a clutch in a standard trans car, locking the turbine to the converter housing for a near 1:1 drive. 1500rpm stall or 3500 rpm stal, at lock up they will both act exactly the same.
Ozz, at 45mph, O/D is a normal gear change. If you don't want it to shift into O/D, drive it around town in D.