None of the '93 -'97 4L60E's are directly interchangeable, except '93 and '94!!!
Here's a list of yearly differences that will show you why. Yes, some years will
fit in others and may not even throw a code, but there will be an issue in the
long run. The big issues become forced 3-2 downshifts, and converter lock up
issues and burnt lock up clutches. When a converter cluych cause it to lose lock
up, the 3-4 clutches, in the transmission will soon follow because the 3-4's
need lock up to keep them cool while cruising in overdrive.
1993: These
were used in trucks only. Not available in F-Bodies, B-Bodies, or
Vettes
1994: Interchangeable with '93 4L60E with no modifications. The
'93-'94 is a NON PWM transmission. This means that the lock up apply strategy is
an on /off arrangement. It has an 11 pin case connector. Does not have PWM cast
into front pump. 1 piece TCC control valve in the valve body. Plate has holes in
plate, marked in diagram below. 1st design 3-2 valve
1995: Stand alone
year! Will not interchange with any other year. This is a PWM transmission. An
extra solenoid was added to the valve body to control the pulsed lock up
strategy of the conerter clutch. It has a 12 pin case connector, extra wire in
the transmission to computer harness and different computer to control the new
PWM circuit. Has PWM cast in front pump. Front pump internal passages different
to match new TCC strategy. 2 piece TCC control valve in valve body. Has holes in
plate, marked in diagram below. 1st design 3-2 valve. 12 pin case connector. '94
computer won't recognise new TCC strategy., and will burn lock-up clutch and 3-4
clutches up. '96 computer isn't compatible with '96 3-2 control solenoid.
1996: The 3-2 downshift strategy was changed to an on /off arrangement.
The TCC control solenoid was changed to a 20-31 OHM solenoid, from the previous
10-15 OHM solenoid. The 3-2 control valve was changed to the second design
valve. The easiest way to identify the valve is, the second design valve will
fall out as soon as the solenoid is removed. The first design has a plug and
retaining clip. TCC solenoid remains 10-15 OHMs, which is the same as the '95
arrangement. Has PWM stamped cast in pump. pump is the same as '95. Will not
interchange with '95 unless changing 3-2 solenoid, valvebody casting, and
seperator plate. Has holes in plate marked in diagram. '94 or '95 computer will
not accept the 20-31 OHM 3-2 solenoid and will throw an SES light and throw the
transmission into limp mode. Some less knowledgeable builders will swap the
solenoid so the computer will see the correct resistance, but the valve itself
then causes downshift issues. If only the solenoid is changed, it will result in
a 3-2 downshift cut loose. In other words...3-neutral-2 downshift. Speedo moved
to passenger side of tail housing, but easily changed.
1997: Basically
the same as '96.
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