7427 pcm connector pins for 4L80e??

[Blazer3664]

I have found several pin-out lists/diagrams for the 7427, but most of the 4L80 wiring stuff is not there.
Anybody have a chart for these?

Thanks,
Jim

[EagleMark]

16197427 was the last upgraded PCM for this line, it came with $0D, $0E etc... Pinouts for 4l80E are in 16196395 PCM info thread.
http://www.gearhead-efi.com/Fuel-Inj...Information-OE

In a eTrans thread it was mentioned a Lt1 PCM that comes with 4L60E would run a 4L80E trans without change. I wonder if $0D would? There is a difference in TCC for 94 to 95 being PWM TCC converter. I don't know what would happen if you mixed a 94 bin with 95 trans?

[Blazer3664]

Thanks, that should help.

Not sure what differences there are with the transmissions. I believe the one I have is a 96, hopefully that dont cause me any issues. Price was right though, straight swap for a 700R4.
If its not one thing its another.

Being able to use $OD woulld be helpful, seems to be a lot more info out for it.

Jim

[EagleMark]

This is from a cahall who got banned on Impala SS forums.

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.

[Blazer3664]

Hmmmm, read the last post here .....................

http://www.fullsizechevy.com/forum/g...4l80e-bin.html

Still looking myself, but I may have to pin him down and beat it out of him, or just ask

Jim

[Blazer3664]

I'll have to make sure my transmission guy knows what computer I am running. Sounds like my rebuild may have just gotten more expensive. Great.

Jim

[Blazer3664]

OK, I got the 12 pin connector, but no "PWM" casting ANYWHERE that I can find. Anyway, by the above that means '95^ so my tranny guy (automotive, not THAT, get mind out of the gutter) should be able to set it up no prob. The old boy is kinda .......crazy, but very good at what he does.

Jim

[gregs78cam]

I don't think that there are letters cast into the pump, I think what he meant was when it is disassembled you can see the PWM valve cast into the back of the pump.

[Blazer3664]

Hmm, ok, I took it to mean it was letters cast in. Thanks for the clarification.

Still, 12 pins and both cooler lines up front means either 95 or 96 from what I have seen.
Everything I have found says 97 on has the cooler lines separated, out up front and return line mid trans. So my guy shouldn't have a problem getting it ready to go.

If anyone here can verify that (cooler line change year) it wouldnt hurt to have that info in the thread for anyone else that searches year breakdowns.

Thanks for the help guys, gave me a heads up to make sure I tell him about the PCM and trans years.

Jim

[EagleMark]

That info was for 4L60E, the origanal thread had pictures of the PWM cast inside pump. But when they banned the guy with more info on trannys then anyone on internet, they deleted his phots too. So I didn't link to post.

[Blazer3664]

OK which was for the 4L60 ? post #4 ?

Just got the plugs out of my trans and inside for a better look. Its older than I thought, has the 91-93 style plug. I nned to figure out if this is going to work or not. No point taking it to be gone through if it wont.

Time to start a different thread.

Jim