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Quoting sherlock9c1:
"To put a ’94 4L60E into a ’96 car:
’96 tailshaft housing and VSS must be installed on ’94 4L60E, before the 4L60E can be bolted into the car.
PCM must be reprogrammed with ’94 4L60E base code to avoid setting a silent code (Check Engine Light (CEL) does not illuminate, but code stored in memory).
4L60E will operate normally without reprogramming, but P1860 (OBD2 equivalent of code 83) will inhibit TCC lockup.
Three potential fixes (any one will work):
1. reprogram PCM so it doesn't look for the PWM solenoid
2. swap the '95-96 harness into the car ALONG WITH the PWM solenoid connected but leave the solenoid in the pan
3. wire up a manual TCC lock switch by which you can lock the converter.

To put a ’95 4L60E into a ’96 car:
’96 tailshaft housing and VSS must be installed on ’95 4L60E before the 4L60E can be bolted into the car.
Technically, the 3-2 downshift solenoid should be swapped also, but experience shows that it is not required."

In 2022, reprogramming to disable PWM of the TCC solenoid is preferred over the other two potential fixes.
 
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