Richie Loff

Hello, I've been lurking around these forums and find there to be a wealth of information. This is my first post so hello.

We are building a 91 GMC Sierra with an LS3 and 4L75E auto transmission swap and I'm the wiring guy. I had to de-pin the transmission side connector from the TC-2 controller harness in order to route the wires through a grommet and although I identified each wire color/cavity, I mixed up the two black/white wires. One is part of a twisted pair (orange/red). Does anyone here have a pinout of the TC-2 harness?

MaroonMonsterLS1

The connector pins will be identified as A through U

You can see the pinout in the attached photo.
Which two cavities currently remain open on your connector?

Richie Loff

F, G, H, J, and W, not including the two Black/White wires which are located at M and V.

I've google searched, of course, and the wire colors in the attachment you provided are different.

Cav Wire Color

A Pink/Black
B Pink/Red
C Yellow/Red
D Violet/Black
E Yellow

Etc.

MaroonMonsterLS1

you're missing a wire at M and at V?

M is a wire for the temp sensor internal to the pressure switch.
There is no wire at V.

Richie Loff

Perhaps not in the diagram you provided, however there is for the TC-2 harness. They are not missing, just misplaced. Both are Black/White.

Why GM does not include a pin out for each connector is beyond me. They do it for the engine harnesses.

vorteciroc

.....................

MaroonMonsterLS1

Which holes are empty in the diagram I provided?
If you can tell me that, theres a good chance we can figure out what you need

Richie Loff

Supermatic "Connect and Cruise TC-2" Transmission Control System

Connector at transmission:

CAV Wire Color

A Pk/Bk
B Pk/Rd
C Yl/Rd
D Vt/Br
E Yl
F
G
H
J
K Or/Rd
L Yl/Or
M Bk/Wt
N Gy/Bk
P Gy/Lg
Q
R Gy/Rd
S Vt/Rd
T Pk/Lg
U Vt/Lg
V Bk/Wt

One black and white (Bk/Wt) wire is part of a twisted pair, which denotes a sensor. Would it be the shaft speed sensor?

vorteciroc

Why didn't you say this was a super-matic controlled unit???

Just to double check... is the TCM a Blue box with red and white lettering on it?

Or is it just a stock looking TCM or ECM/ TCM combo box?

The stand alone super-matic Blue box is wired differently... I did not think they were for sale any more... Maybe new-old stock...

I will try to find some old GMPT over the counter PARTS instructions for you.

Richie Loff

My apologies, I assumed the TC-2 designation was descriptive enough. It's a black box with a blue connector. White label with black writing, circular blue symbol in the center.

Here's some additional information regarding the kit components:

Trans control unit # 19302406 (4L60) or 19302411 (4L80)
Trans control harness # 19302408

Thanks for the assistance so far.

vorteciroc

Which one of these photos most looks like the TCM you own?

1.



2.



3.

vorteciroc

Okay... So you do NOT have the oldest version, but you do NOT have the newest version either.

I am going to look for wiring info on the version you have...
I do not have OTC parts info on "NON-OEM/ RPO parts" in any of my books or digital database...

I will have to make some phone calls to the guys over at Chevy performance parts marketing to try and get some info.
It may take a few days... Hopefully someone else has one of these TCMs or has info to share with you in the meantime.

Richie Loff

I apologize profusely!! I work in a large shop with several others and the USB flashdrive that came with the kit was misplaced. I finally found it and on it was a "Customer Drawing" which is the schematic I need. I've attached it for future reference. I apologize again for wasting everyone's time.

Thank you so much for your help; I will be lurking here for some time to come