TC lockup delay
 

Does anyone know who may make a lockup delay for the 4t60e? I have one on my 87 K5 Blazer(700r4), and it plugs inline to a 4-wire connector on the side of the tranny. Like a wiring harness extension. Very simple. No adjustment or anything to be done. Keep the torque converter from locking up until in O/D and over 55 mph. Thanks in advance.