Allison Swap Update

It’s time to announce that many electronic engines can share required signals to the Allison transmission control module by plugging in a connector I provide in my harness to an engine harness diagnosic connector which is J1939. I’ve been working with J1939 for some time and below is a list of those I have confirmed work with my system so far.

  • Any commercial or medium duty electronic Cummins
  • 98.5-02 Dodge Cummins (have two customers running this now).
  • ’10 and newer Dodge Cummins (have one customer running this now).
  • ’99 and up T-444E (have two customers running this now)
  • Any other engine that has J1939.  Typically these applications have a 9 pin round diagnostic connector in the cab.  5 pin round are definitely not J1939 equipped.  The engine harness diagnostic connectors typically look like these and typically have yellow, green and sometimes a third black wire in them:
Standard J1939
Weather-Pack (round terminals) or Metri-Pack (blade terminals)

Engines that I am still working on or are confirmed that do not work:

  • 03-05 Dodge Cummins – has the diagnostic connector but apparently  does not have the correct source address.
  • 06-07 Dodge Cummins – does not even have the diagnostic connector.
  • 07.5-09 6.7 Dodge Cummins – has the diagnostic connector but apparently does not have the correct source address.
  • 98-99 3126 CAT does not work, newer models may. These are in F-650,750 Fords, and other medium duty trucks.

Cruise control data is still being confirmed on some applications, and I still provide wiring to use backup analog tps signal capability with my TCR module, which takes care of cruise control responsibilities on the transmission side if for any reason the J1939 signals do not work.

Part of the reason for this announcement is this info is leaking out already and sooner or later my competitors will be saying they “figured” it out :).   I wanted to wait until I had more confirmation on cruise data before I officially announced it.  Cruise data is really required for the system to fully work – if there is no cruise data then the system has to be set up with my TCR module for the trans to work properly when cruise control is active.  At this point it is also unclear if there will be other J1939 data collisions.

I’ll be posting updates here as I have confirmed things and as always your comments and questions are welcome.

Jason D

Author: Jason D

'89 Suburban has a 4bt/6 Speed Allison. '97 Dodge has a 12 v/68RFE. '74 GMC has 350 and 5 speed Allison. All equipped with quick connections for testing out harness builds.