Stickied: Lets walk through the differences between '94,'95,'96 and'97 4L60E's - Chevy Impala SS Forum
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Old 02-21-2012, 03:16 PM
cahall cahall is offline
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Default Stickied: Lets walk through the differences between '94,'95,'96 and'97 4L60E's

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.






Frank

Last edited by cahall; 02-21-2012 at 05:20 PM.
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Old 02-21-2012, 04:56 PM
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Finally something interesting to read on ISSF!

It has been a while. I really enjoyed the other thread too!

FYI, on the B bodies, the speed sensor was moved in 1996.
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Old 02-21-2012, 05:18 PM
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Quote:
Originally Posted by HuSSker View Post
FYI, on the B bodies, the speed sensor was moved in 1996.
Duh... Brain fart. It was pm everything else, too...LOL Thanks.

Frank
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Old 02-23-2012, 06:22 AM
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Quote:
Originally Posted by cahall View Post
...... 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.
.......
Frank, can you explain that one a little more. How do the 3-4's generate heat while cruising in overdrive? Plus, my understanding is that fluid flow through the cooler is reduced when the TCC is locked. It's no mystery that fluid temp will rise without TCC lockup, but why specifically the 3-4 clutch pack?
TIA.
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Old 02-23-2012, 09:21 AM
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Not arguing here, just discussing, trying to make the connections in my own head.
I'm still having problems with two things:
1. Where is the heat generation coming from in the 3-4 clutches when cruising? there should be no slippage going on to do that.
2. For the TCC failure to cause a fluid routing problem, I assume you must be talking about a failure of the mechanism (either in the TC or in the valvebody), and not just a TCC friction material failure as I think most of us assume. correct?
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Old 02-23-2012, 11:27 AM
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when an O/D transmission has a ratio greater than 1:1m it obviously brings engine RPM down. It will often do so enough the the sprag in the converter will start to unlock, thus generating more heat. With the converter locked, this isn't an issue. The 3-4 clutches are the first area to show the danage caused by the excessive heat. This may be aided somewhat in vehicles with a 3.73 or lower gear, because RPM's won't drop enough to cause the sprag issue in the converter. When I explained all this, previously, I was basing things on a stock vehicle. Using the wrong year will still burn the converter clutch up, and will still aid in future failures. A slipping converter clutch is still going to generate heat, and then begin to shed metal or debris into the transmission.

Frank
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Old 02-23-2012, 12:14 PM
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bad ass ! stickie needed.
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Old 02-23-2012, 01:18 PM
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bad ass ! stickie needed.
He'll be a mod before too long...

Nice job, Frank!
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Old 02-23-2012, 03:11 PM
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There is a Transmission interchange guidewritten by sherlock linked in the sticky list. The information in that is accurate as far as interchanging year to year. They are able to be interchanged quite easily with a few minor modifications.
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Old 02-23-2012, 03:43 PM
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Quote:
Originally Posted by Dustman. View Post
There is a Transmission interchange guidewritten by sherlock linked in the sticky list. The information in that is accurate as far as interchanging year to year. They are able to be interchanged quite easily with a few minor modifications.
Incorrect information...
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