1999 Silverado with 9373372 OS 4l80e swap help please
So as the title states, I have a 1999 Silverado with a 5.3 that I just did a 4l80e swap on. It has a 9373372 OS and with the tune repository gone I cant find a tune that I can segment swap. Could anyone help with one or possibly steer me in the right direction for getting this tune taken care of? Thanks.
The main thing you need to change are gear ratios first you can google and find them for the 4l80e and did they install the swap plug on the transmission connector?
I’ve done segment swaps before but I don’t have a 4l80e segment with the correct OS to swap in. I emailed HP Tuners and they said that I need to change the OS. Any idea how I do that?
It can be done with the 4L60E segment, you need 2 relays, and turn off some codes, update trans ratios and shift points etc, have done it this way several times no issues
"To drive a 4L80E transmission from a 4L60E segment:
- discard the 3-2 control solenoid signal.
- drive the 4L80E 2-3 shift solenoid by using a relay to invert the 4L60E 2-3 shift solenoid signal
-use the 4L60E TCC ON/OFF signal to control a relay which gates the 4L60E TCC PWM signal to the 4L80E TCC PWM solenoid.
To invert the 2-3 shift signal:
relay is connected as follows:
- the relay control coil is connected between 12V and the 2-3 shift solenoid signal from the PCM,
- the NC (off) relay contact goes to GND,
- the NO (on) relay contact goes to 12V,
- the swinging/gated contact goes to the 2-3 shift solenoid signal in the trans,
i.e. so when the PCM has the signal off (12V) the relay turns it on (GND), and vice-versa"
I FOUND THIS INFO ON INTERNET AND TRIED IT WITH GREAT RESULTS
Last edited by castorjames; 08-28-2018 at 11:25 PM.
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