View Full Version : TCC Lock-Up


HUF
10-29-09, 02:17 PM
Does a TCC lock up at specific speed, throttle angle or a combination of the both? And what are the numbers for 4L60E?
Thanks!

V-Eight
10-30-09, 08:18 PM
Cruising speeds, low throttle input....not sure the exact numbers

dirt_cheap_fleetwood
10-31-09, 03:12 AM
Sometimes it locks under heavy throttle though to prevent power loss at speed.

jayoldschool
10-31-09, 10:03 PM
Should lockup around 45. You can test it by getting up to speed, keeping your foot on the gas, and stepping on the brake lightly at the same time. The switch that turns off the cruise also unlocks the TC. You should notice the RPM go up a bit. In a Caddy, it will be pretty quiet, of course, so you can verify TC lockup/unlock by accessing the tach function in the HVAC display.