94adam89

The tranny in my car dropped 3 and 4 last week.! What years will fit my 95? From what I understand I need lne with 13 pin plug? I found one rebuilt w/ only 8k miles for $450. He says its from a 91 and will work but I have my doubts. Did they even build these trannys in 91? Thanks


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shoebox

95 would obviously be a direct swap. I think 96-97s would work, as well (better verify). Anything earlier, no (or not without modification). 4L60e started in 1994 in the f-body.

12SCNDZ

'95 is a "stand alone" year. Only a '95 will work in a '95. '94 was non PWM, and they changed the 3-2 downshift strategy in '96, requiring a different solenoid, valve body, separator plate, and wiring.

Frank

12SCNDZ

...From a post I made for another forum...

None of the '93 -'97 4L60E's are directly interchangeable, except '93 and '94 and '96 and '97!!! 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.

94adam89

So the only option i have is a 95? What about one from a 95 corvette?


Doing what I like and not what I should!

94adam89

Or how about a 95 trans am?


Doing what I like and not what I should!

12SCNDZ

A Transmission for a '95 Trans Am will work.

Frank

94adam89

Thanks. I just need to find a decent used one. I cant afford 2k worth of tranny work right now


Doing what I like and not what I should!

94adam89

So any trans that I find with PWM cast into the pump are 95's? I found a handful of used trannys but 2 of them say they were from 96's. i need to get one here right quick.


Doing what I like and not what I should!

94adam89

Oh and by the way the one is from a 96 camaro cop car. Hes asking $100 for it. Says it worked fine when he pulled it. He just wanted the motor.


Doing what I like and not what I should!

12SCNDZ

No. That is NOT correct. All 4L60Es built after '94 have PWM cast into the pump. The only way to tell for sure is if it still has the ID tag on the bellhousing, or pull the pan and check the solenoid.

Frank

94adam89

Sorry. After reading a few more times what u posted. I see that they all had the pwm. So is there any way to swap my valve body, the solenoid and seperater plate to make it work? Or will I still have issues with the computer disagreeing?


Doing what I like and not what I should!

94adam89

The guy also told me that it has a 13 pin plug.


Doing what I like and not what I should!

12SCNDZ

Yes, you can swap the separator plate, valve body, and wiring to make it work.

Frank

94adam89

Ok thanks alot. I would love to just have it rebuilt but I just cant swing it right now.

Now just to be sure again. To use the 96 in my 95, changes need are....- swap valve body, seperator plate,entire trans harness, and the 3-2 solenoid. Last time I will ask... Promise !!!! Haha


Doing what I like and not what I should!