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;
- drive the
4L80E TCC PWM solenoid from the
4L60E TCC ON/OFF signal (discard the 4L60E TCC PWM signal),
or see Alternative below;
Alternative (see posts #27 and #29 here, thanks GNXClone/Mike):
use the
4L60E TCC ON/OFF signal to control a relay which
gates the
4L60E TCC PWM signal to the
4L80E TCC PWM solenoid:
TCC PWM warning:
the 4L60E may on occasion park the TCC PWM signal at 90% while the TCC is off,
this is the reason you don't want to drive the
4L80E TCC PWM solenoid solenoid
directly from the
4L60E TCC PWM signal signal
(i.e. use a relay as
Alternative says, or use the
ON/OFF signal).
Note:
The F-car 4L60E segments keep the TCC locked on closed throttle decel (until vss goes below the unlock curve).
The Truck 4L80E segments (there are no 4L80E car segments) unlock the TCC on closed throttle.
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.
Also:
need to provide wiring to input 4L80E ISS signal into PCM.