------------------------
  This is a switch that controlls when your lockup converter is
engaged.  I have an 89 GT with the thm-125 transmission.  My switch went


out and caused the car to buck and die when it warmed up.  It felt like
my car was a manual and I wasn't pushing in the clutch.


Disconnecting the switch is only a temporary fix and will hurt gas
milage but nothing else.  If this is the problem, then it can wait until


you can afford to fix it.


I know that the TCC plug is kinda hard to find.  It is also hidden from
above by the airbox on my 2.8.  Do you have the 2.8 or 4-cly?  It would
be
easier to see the TCC plug from above in my car with the airbox removed.


The two wires going into the plug should be:  One Purple, and One Tan
with
black stripe.


---------------------------------------------------------
When the TCC switch goes bad the car generally acts like this.  You
leave
for you destination and everything  is great.  After the car warms up a
little the car starts acting like you wonderful automatic has decided to


turn into a manual transmission without giving you a clutch.  ;^)  The
car
will buck and shake when you slow down to stop just like when you stop
in
a car with a manual without pushing in the clutch.  The car is nearly
impossible to get moving again without letting it cool down or dropping
it
from neutral to drive with the engine revved way up.  (ouch)


To temporarily fix this problem you just need to unplug the computer
control to the TCC.  This only hurts gas mileage and makes the engine
RPMs
a little higher at speeds above 45 MPH.  The plug you are looking for is


on the front of the transmission on the bell housing.  (where the engine


and transmission meet)  The plug has two wires going into it and usually


has a blue cover.  The two colored wires are:  ONE Purple, and ONE Tan
with a Black stripe.  It can be reached from above or below the engine.
To see it from above the engine you may have to remove your airbox.  The


plug has a latch on it that makes it difficult to remove, so just be
sure
that you find this before you pull too hard.


I hope that I haven't missed anything and have helped.  If you don't
have
an automatic then this cannot be your problem.  Since I recieved little
info about your car I cannot be sure this is the problem.  You will not
recieve any computer codes or trigger the check engine light by
unplugging
this connection.


-------------------------------------------
Well I guess I'm the resident expert on the TCC, sooo...


The TCC should cost you around $200 US to have fixed.  Or you can go to
a GM
dealer and buy the part yourself.  It cost something like $45 US.  The
process
is somewhat involved but if you feel like you would like to do it
yourself
then let me know and I'll give you directions.


It will only affect your RPM's at above 35 MPH.  Your RPM's will be
about
5-700 RPM's higher and thus cause your MPG (or Km/L as my digital says)
to
decrease.  Having it disconnected will not damage the transmission, but
I
recommend fixing it when you have the money.


----------------------------------------------
The part is the TCC SWITCH or SOLONOID.  It is inside the side pan on a
THM-125C.
This area isn't real easy to get to.  It took me several hours to fix.
Small hands
are a plus to reach around and replace the switch.  A fuid change is not


necessary.


Here is the part number that is on my receit. 8689901
I don't know if that is a GM part # or not.


--------------------------------------------------------
Yes it CAN be done by a shade tree mechanic.  You will have to be the
ultimate judge of
wheter you can do it yourself or not.  Make sure you get a new gasket
for the side pan
before you start.  They are difficult to find by themselfes.