Not the main subject of my post, but about my truck transmission. I checked with several transmission rebuilders and suppliers. Plus the interchanged databases. All state that only 1993 and 1994 4l60E transmissions for trucks interchange. Nothing else. 1995 is worse and only work for 1995. I have no idea if there is any work around with some to make others fit. My case is bad in my 1994. So I have been looking for a clean 4L60E case with no cracks or pieces missing. From info I have gotten so far, the only case that will work in my truck must come from either a 1993 or a 1994 without PWM and made for a 5.7 small-block and 4WD. Here is the info that I have found from several sources.
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.
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