How can I get this done. I converted my 89 Formula so that its running on the 411 ecm and I have a 94 4L60E bolted up. Everything plugs in fine except two things. First off whats PWM (sp) that the 94's didnt have. Do I need this put into it? Also Will my 700R4 talshaft bolt up and be able to put in a 94 VSS so also plug into my unit?

 

TCC PWM was something that was added in 1995 to the 4L60E. As I understand it, GM's customers complained that torque converter clutch (TCC) lockup was too abrupt so GM added a new solenoid that allowed the TCC to be "pulsed" into and out of operation to make it smoother.

Could you elaborate on which PCM you are running? What I can tell you is that if you are running 1995 or newer PCM, you can run a 1994 4L60E without the TCC PWM solenoid, but you have to disable the PWM diagnostic in the PCM's programming. My 94 Impala SS is running code from a 1995 F-body and it works fine without the TCC PWM solenoid.

I can't answer on the 700R4 tailshaft question, but I do believe the provisions for the VSS are different between the 700R4 and 4L60E cases. If you must run the 700R4 tailshaft, and they are indeed interchangable, you may need to do some fancy work in the PCM programming to use the 700R4 VSS.

 

I am using an ecm out of a 02 Z28 Delphi 12200411 . It has the blue and red screw down connectors. This ecm was used from 99-02 in the Vettes, F bodys and some Trucks

 

I'm accually looking for a 96-97 Tailshaft now as my connector on my harness is for the vss of that year. Well up to 02 but I need it from an Fbody one to retain the torque arm

 

Wow, that's a sweet mod (running the LS1 style PCM). My Camaro uses the earlier version of that PCM, service number 09354896.

According to my 99 Z28 factory service manual, not having the TCC PWM attached would throw a code P1860 - "TCC PWM Solenoid Circuit Electrical". The result would be the PCM would refuse to engage the TCC, and would not perform adaptive shifting strategy.

However, if the newer PCM works like the 1995-1996 LT1 PCM, you can disable this diagnostic in the PCM and avoid this situation. I've never tried it, though.

 

Yea its very sweet. Keep your eye out in the mags during the summer I have both cars running this system. It was about 1200 invested to get it running. But tuning with EFILive, its soooo nice. I would have kept my 700R4 but there was no way to control the TCC on my 89 tranny other then using a TCI kit or something. + I had a 4l60e core so I said ehh might as well build it up and put it in.

 

:-) I transplanted an OBD2 LT1 PCM into my 1994 Impala SS for the exact same reason - I wanted to use the OBD2 tuning and datalogging software instead of OBD1. That was pretty easy - I moved the Field Service enable pin to the Class 2 data pin on the PCM, swapped out an OBD2 diagnostic connector and ran power to the OBD2 diagnostic connector. But, your project is a much more involved undertaking. You have the basis for a great product, though. That's a really good idea.

You might have been able to wire the TCC enable circuit on the 700R4 into the TCC enable output on the 411 PCM. I'm guessing they both work the same way (TCC enabled when voltage is applied). But, getting the PCM to work properly without control of the rest of the transmission might have been an impossibility (e.g. you would have had to disable a LOT of diagnostics in the PCM).