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The Computer can operate the TCC in all Forward range positions. This diagramshows the valves in the lock up off position. The TCC solenoid is a normally OPENpulse width modulating solenoid that is fed main line oil in all ranges.
When the computer commands the solenoid to start modulating, the solenoidpushes the valve up and exhausts the oil from the front of the Converter Clutchallowing it to lock-up. This diagram shows the valves in the lock up on position
It is very important to be absolutely sure this orifice is clear of debris, if this pas-sage is clogged, main line pressure can’t get to the TCC solenoid. This will preventthe TCC from locking-up and cause a number of codes that associate to TCCoperation.
You have built the transmission the best you can and it wont lock up, now what?Simple: build a lock up tool. This tool will tell you absolutely that your Torqueconverter and pump are working correctly.
Lock-Up Test Tool
Carefully pull the solenoid apart. It’s not necessary to remove the allen screw andspring from the tip of the solenoid.
Secure the solenoid plunger to the Snout of the solenoid with a small hose clamp.Be sure the screw portion of the hose clamp is aligned with flat on the solenoidsnout. If its not aligned properly it will not fit into the solenoid body
Remove existing TCC solenoid and install the tool as shown. Put the pan back onand fill with fluid.
CAUTION!This will cause the TCC to be engaged in all ranges. If the TCC and the pump areoperating properly the transmission will kill the engine right away. Engaging thetransmission with the TCC on will be very hard on the new TCC lining, so keepthis test to a minimum.
This truck was setting a code 1744 TCC performance. This truck also had verylittle if any lock up feel to it at all. The problem was a misplaced retainer clip.Turns out the rebuilder had pushed the sleeve in one land too far.
Before or after the rebuild and the TCC is on all the time killing the engine. Wecan modify a solenoid so that no oil is fed to the TCC control valve. If the TCC stilllocks up then we KNOW that this is going to be a hard part issue. This test willcompletely block oil from getting to the TCC solenoid.
TCC Stuck On
Remove the End cap
Using an Allen,remove the screwfrom the Solenoidbody
Remove the AllenScrew and Spring
Install check balls to blockthe valve into the solenoidsnout