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Part # TCI-9006 

Revised 9/6/2016 

Toll Free: 1.888.776.9824 
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TCI

®

 Automotive 

151 Industrial Dr. 

Ashland, MS  38603 

Phone:  662.224.8972 

checks  well,  electrically,  it  can  also  be  tested  for  mechanical  function.  With  no  power  applied,  you 
should  be  able  to  blow  air  through  the  end  of  the  solenoid.  Then  put  power  to  the  solenoid  (12V  to 
positive  side  &  ground  the  negative  side)  and  the  coil  should  force  the  checkball  onto  its  seat, 
preventing air from going through the solenoid. Also be sure to inspect the condition of the rubber 0-
ring  on  the  end  of  the  solenoid.  It  needs  to  provide  a  good  seal  inside  the  bore  where  it  is  housed. 
Replace if necessary. 

 
Q:

 

I checked my solenoid but I keep blowing fuses when the system tries to activate. What should 

I do? 
A:

 If the solenoid is not internally shorted then the problem is most likely a pinched or exposed wire 

on  the  positive  side  of  the  circuit.  An  easy  method  to  check  for  a  short  in  the  system  without  first 
removing the transmission oil pan is to disconnect  your power supply from the red wire on the TCI

®

 

external  wiring  harness  and  measure  the  resistance  between  the  red  and  the  green  wire.  It  should  be 
between 24.5

 and 26.5

. If you get a reading of 0, then the short is located within the oil pan. If the 

reading  is  OK,  check  the  resistance  from  your  power  supply  to  ground.  There  should  not  be  any 
continuity between your power source and ground. 

 
Q:

 

The system is functioning properly as far as I can tell, but the torque converter won’t lock up. 

What’s wrong? 
A:

  The  wiring  harness  and  solenoid  only  comprise  a  fraction  of  the  entire  lock-up  system  on  your 

transmission. In order for the system to work properly the converter clutch valve in the pump must be 
operable, the friction lining and apply piston in the torque converter must be in working order, the 0-
ring  on  the  end  of  the  input  shaft  must  be  in  good  condition  and  some  valve  bodies  even  have  an 
additional converter clutch valve in them as well which must be functioning.It is possible for anyone of 
the  aforementioned  components  to  malfunction  causing  the  lock-up  system  not  to  work.  Have  a 
qualified technician help if you suspect something else is wrong. 

 
Q:

 

What is the setting on the vacuum switch? 

A:

 The vacuum switch comes factory preset to close at 8 - 10 inches of Hg. This means that in order 

for the solenoid to be activated the switch must get 8 - 10 in. Hg. or higher. If you find that the torque 
converter lockup experiences "busyness" (shuttles on and off rapidly) at cruise conditions it is probably 
because your engine vacuum under that particular condition is right where the switch turns on and off. 
This can be verified with an engine vacuum gauge. 
 
If you have a "busyness" problem the switch can be reset. Remove the switch from your transmission. 
Locate  the  small  dimple  in  the  center  of  the  switch  on  the  side  marked  "World  Magnetics".  Using  a 
1/8"  drill  bit, 

by  hand

,  gently  remove  the  potting  material  to  expose  the  adjustment  screw.  Using  a 

small  Allen  wrench,  turn  the  adjustment  screw:  clockwise  to  raise  the  vacuum  required  to  close  the 
switch  and  counterclockwise  to  lower  it.  The  adjustment  screw  is  sensitive  so  it  does  not  need  to  be 
moved very much to make a difference. A small dab of silicone will seal the adjustment screw when 
you are done. 

 
Q:

 

Can 

activate 

the 

torque 

converter 

clutch 

in 

low 

gear? 

A: 

No. The transmissions are

 

designed by General Motors to enable the lock-up system only after the 

second gear shift has occurred.

 

 

Summary of Contents for 376600

Page 1: ...ow the fluid to be drained After the fluid has drained remove the rest of the bolts and pour out the remaining fluid If your transmission did not come with a drain plug you may want to install a TCI 805800 universal drain plug kit into your pan now that you have the pan off Remember To Dispose Of Used Oil In An Environmentally Safe Way Step 2 Remove original internal wiring harness Carefully disco...

Page 2: ...ssion case connector into the transmission If you are working with a 700R4 you may want to transfer your OEM plastic wire retainer from your factory wiring harness to the TCI wiring harness in order to keep wires neatly in place Step 5 Figure 4 shows how the external wiring harness is intended to be connected To use the 4 machine screw to retain the switch to the case a new 3 32 hole must be drill...

Page 3: ... switched 12 volt source Now you may manually turn the lock up system completely on and off Option 3 is for those who desire immediate release of the TCC when braking For this you ll need an OEM brake pedal switch with a normally closed circuit Run your switched 12 volt source through the brake switch and then to the red wire on the TCI external harness Step 7 Reinstall Transmission Pan Install a ...

Page 4: ...t first going through a pressure switch than it can simply be left in place because that is how the 376600 is wired as well Q What do I do with the other pressure switches that are on my valve body A The simple thing to do is just leave them in place even though they are not hooked up They cannot be removed unless you replace them with 1 8 pipe thread plugs Q What do I do with the extra green wire...

Page 5: ...rder for the system to work properly the converter clutch valve in the pump must be operable the friction lining and apply piston in the torque converter must be in working order the 0 ring on the end of the input shaft must be in good condition and some valve bodies even have an additional converter clutch valve in them as well which must be functioning It is possible for anyone of the aforementi...

Page 6: ...ars chances are that there is something else wrong with the transmission The wiring harness is only responsible for turning the torque converter clutch solenoid on and off and it has no effect on the transmission s ability to go into and hold reverse and the four forward ranges Have any problems diagnosed and repaired by a qualified technician immediately Social Media Stay up to date with the late...

Page 7: ...ity for any errors made in tolerances component selection or installation There is absolutely no warranty on the following Any parts used in racing applications Any product that has been physically altered improperly installed or maintained Any product used in improper applications abused or not used in conjunction with the proper parts Damage due to excessive manifold pressure e g nitrous backfir...

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