Mean Green z28

iTrader: (19)

Hi guys, sorry about creating yet another thread about a Silverado with 4L80E swap, but I really haven't found any relevant info pertaining to a 2009 that has no PRNDL switch mounted on the 4L60E from the factory.

Background ... here's what I know of the project.

The swap was already done a few years ago using what seems to be a Frost adapter harness; this is the harness with the two relays so I'm assuming it's the updated version. The truck wouldn't start due to not getting a Park/Neutral signal, so the tech at that time was instructed to wire up a single wire from the PRDNL switch Pin 3 to the orange/black wire on the Trans Harness, the Black/white was grounded.
The Trucks starts and runs/drives fine and shifts through all gears etc. BUT there instrument cluster does not show the shift lever position and the BCM, I'm guessing, doesn't get the status either as the auto door unlock stuff doesn't work. Nor does the reverse lamps work!

What I know for now. The 4L80E being used (new style where the trans lines are separated by about a foot, and has a PRNDL switch also mounted on the shifter shaft) supposedly does not have the internal switches to give the harness the A,B,C,P, etc. status, therefore we need to run the PRNDL switch wires into the factory harness as done with the Park/Neutral status. However, the wire currently run is pin#3 and all the schematics I've seen show pin 2-3 not used and pin#9 as the Park/Neutral status.

Currently, the plan is to run all the necessary status and ignition voltage wiring from the Frost adapter harness to the PRNDL switch instead of the trans; and disconnect them from the transmission end of the harness, but ofcourse leave all the other wires that control the trans ... or should we just t-tap into the Frost harness?

If anyone has ANY insight or information, please direct me there.

THANKS!

Mean Green z28

iTrader: (19)

This is what I have for the PRNDL switch wiring

PIN COLOR CIRCUIT FUNCTION
1 DK GRN 1433 CLUTCH START SWITCH SIGNAL
2
3
4 YEL 772 TRANSMISSION RANGE SWITCH SIGNAL B
5 BLK/WHT 771 TRANSMISSION RANGE SWITCH SIGNAL A
6 GRY 773 TRANSMISSION RANGE SWITCH SIGNAL C
7 BLK/WHT 451 GROUND
8 WHT 776 TRANSMISSION RANGE SWITCH SIGNAL P
9 LT GRN 275 PARK NEUTRAL POSITION SWITCH SIGNAL
10 GRY 1524 BACK-UP LAMP SUPPLY VOLTAGE
11 PNK 839 IGNITION 1 VOLTAGE
12 PPL 63 IGNITION 1 VOLTAGE

This is what I have for the 2009 4l60E Transmission connector pinout for the truck

PIN COLOR CIRCUIT FUNCTION
A L-GN 1222 1-2 SHIFT SOL.
B YE-BK 1223 2-3 SHIFT SOL.
C OG/BK 1228 PC SOL. VALVE HIGH COTROL (SOL. A)
D BU/WH 1229 PC SOL. VALVE LOW COTROL (SOL. A)
E PK/WH 2139 IGNITION 1 VOLTAGE
F TN/WH 771 TRANSMISSION RANGE SWITCH SIGNAL A
G YE 772 TRANSMISSION RANGE SWITCH SIGNAL B
H GY 773 TRANSMISSION RANGE SWITCH SIGNAL C
J WH 776 TRANSMISSION RANGE SWITCH SIGNAL P
K OG 1983 AT ISS HIGH SIGNAL
L YE/BK 1227 TFT SENSOR SIGNAL
M TN 2762 LOW REFERENCE
N BK/WHT 451 GROUND
P - - -
R - - -
S - - -
T TN/BK 422 TCC SOL. CONTROL
U BN 418 TCC PWM SOL. CONTROL
V L-BU 1984 TRANSMISSION TURBINE SPEED SWITCH LOW REFERENCE
W OG/BK 1786 TRANSMISSION PARK/NEUTRAL SIGNAL

Mean Green z28

iTrader: (19)

Here's the plan...I've listed it by pin letter/number

Pin#4 --> Pin#G
Pin#5 --> Pin#F
Pin#6 --> Pin#H
Pin#7 --> Pin#N
Pin#9 --> Pin#W
Pin#11 --> Pin#E ... not sure if this is needed as there is no reverse signal/etc. on the PRNDL switch

GXPJAY

I only have experience with the 07 GMT-900 which had the PRNDL switch on the stock 4L60E so that part is different but for mine I didn't use any harness' at all to do the swap. I moved a couple wires around at the tranny plug and at the TCM, added the front ISS plug and wires and that was it.

For tuning what we did was we flashed the truck with a file from a stock 4L80E van, then took a spare TCM and installed it in, flashed the truck back to my previous truck tune (made sure we read the truck file and saved it of course) then we put the original TCM that has the 4L80E tune back into the truck then read the whole thing again in HPT and that became my new base file. Worked like a charm and we started tuning the trans from there.

Wiring Info:

-Remove K(orange), V(light blue), S(white), T(tan/black) and U(brown) wires from transmission connecter.
-Move U(brown) wire to the S location.
-Front Input Speed Sensor (ISS) is made by using the orange and light blue wires.
-Add a VSS connector, connect orange to terminal A and light blue to terminal B.
-Move the low signal wire from pin 45 to location 26 in the TCM harness.
-Install the front Input Speed Sensor wiring connection
-Install the shift selector switch on the driver side you removed from the 60.
-The factory speed sensor can plug back into the 80e tailshaft sensor(of back into the Transfer case if 4x4)

Mean Green z28

iTrader: (19)

thanks for your reply. Everything else seems to work using the Frost harness. The harness allows the trans to be controlled without a segment swap, and so far everything works and shifts correct. Only issue as mentioned was that the BCM doesn't know what's happening. The main difference is that the '08 and older used the PRDNL switch and the 2009+ uses the transmission internal switches so hopefully, getting these wires hooked up will bring it all together.

Hope the sale of your truck is going well?

GXPJAY

Can't do a segment swap anyways on a GMT-900 Good luck hope those wires fix it!

I have a couple pr people interested so we'll see what shakes out!

Mean Green z28

iTrader: (19)

lol, shows how much info I found pertaining to this truck, haha

Mean Green z28

iTrader: (19)

BUMP? any other input?

Mean Green z28

iTrader: (19)

In touch with Frost, there is an ad-on harness to add the PRDNL switch to his Harness for the 2009+ models. Seems the harness I have is for a earlier year swap that already has a PRDNL switch on the trans./factory harness ... whereas the 2009+ like mine doesn't

Pic attached of the beast...

Choda

iTrader: (1)

well seems like you have it figured out now lol