"the stall speed is different thatn the lock-up"
Right............. that's why I said I believe stock stall speed is 1800 and I'm not certain what governs lock-up?????? But I agree w/Muddy, I think it's a function of load. Mine is extrememly annoying and locks at low rpms when it shouldn't... I can really feel it lock and unlock. There's a product out there which allows you to control or delay lock-up for the E4OD, I'm seriously considering that (not the B&M ka-boom nuke your E4OD unit).