Allison 6sp: Ats converter locking issues

[djms]

Hey guys I got a Ats converter with a Suncoast 4 kit and my converter doesnt lock consistently. If I step on it from a dead it sounds like I'm driving a hydrostat it will stay at 3400 rpm till about 80 mph or fifth gear before it locks. If I wait to step on it till it's locked then it is fine and occasionally it will lock sometime in 3rd gear. I've tried to fix it with efi by changing it so that it should lock right after it shifts into second gear but it don't change anything. Any idea what the problem could be? The converter don't have that many miles and I'm not sure what the stall is.

 

[Bryce418]

i'm pretty sure your experiencing what many have. it seems that when the tcm see too high of a difference between input and turbine speed the tcm won't command lockup. it's compounded by a loose converter that doesn't couple well (which in my opinion the ats couples like shit)