white3800camaro

iTrader: (6)

I have a 1966 4l60e I am building to put into my 1995.

I have a 1995 valve body and electronics that are going into the 1996, as well as the correct style tail shaft housing and VSS.
Now I have to address differences in the pump

I have read a few places they are the same.
Other state 1995 is its on it's own.

If they are different, what makes them different?
Can something be swapped between the two to make it interchange?

The 1996 pump I have has less than 20,000 miles on it OEM.
So I would like to use it if at all possible.

mrvedit

In '95 GM changed to the "PWM" TCC apply method. This affects the bump, the valve body and the solenoids. As far as I know some but not all '95 are PWM; all '96 are PWM. The letters "PWM" are cast into the front of the pump body. The PWM and non-PWM pumps and valve bodies are not interchangeable; the fluid castings are different. '95 is an odd-ball year and I would be very careful mixing '95 and '96 parts.

A pro builder would need to confirm this, but if your '95 was a PWM unit, it is likely you can use its valve body with your '96 PWM pump.

white3800camaro

iTrader: (6)

Awesome, the pumps are identical, I will confirm part numbers on them tomorrow.

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.




This is off impalaSSforum.com, I was using it to get my information, but you can never be too sure. I don't want to risk any damage.


Thanks again for the help!

mrvedit

That info looks right. So your '95 PCM will only work with a '95 valve body, but as I read it, you can use your '96 pump in your '95 trans.
But your signature indicates a '96 Camaro; a '96 PCM will need a '96 or later valve body.
Those pre '96 4L60E are tricky to interchange parts with.

white3800camaro

iTrader: (6)

Yeah, I should really update the sig.

My car started life as a 1996 V6 car.

I bought a totaled low mileage 1995 Z28 and put the lt1 and 4l60e out of that in my car.

So it is a 1996 body, with 1995 engine, transmission, and pcm.


Thanks again for the help!