2006 - 2008 Allison A40 TCM
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Our brand new Pre-Programmed TCM comes with your choice of either OEM factory calibrations or our Custom EFILive calibrations. 


Benefits of our Custom Tuned TCM include:


  • Improved throttle response.
  • Revised shift strategies for better shift rpm and quality.
  • Improved Torque converter lock-up.
  • Increase MPGs.
  • Extend transmission life.
  • Works with factory or aftermarket ECM programming.  


 This plug and play TCM is delivered right to your door and takes roughly 5 minutes to install.


No dealer visit.  


No core required. 


2 Year Warranty




The A40 Transmission Control Module found in the 2006-208 2500/3500 Duramax is prone to failure. The internal circuit board fails and is not serviceable.  When this failure occurs you may observe messages such as Range Shift Inhibited, Service Brake System, Service stabilatrak, or might experience loss of gear shift indicator on dash, slamming into Drive or Reverse, and DTC U0101 for loss of communication with TCM.




 This repair at a dealership can cost upwards of $1000 and can take a couple days to get repaired.  Our TCM will have you back on the road quickly while saving you money. 


Will Not Work in 4500 or 5500 trucks.

Shipping information

Cutoff time for same day shipping is 3pm Central Time.  If ordering Next Day Air be advised that NDA does not deliver on Saturday.  For Saturday delivery or if you have any questions please give us a call.  815-977-5865

  • Item #: A40

2006 - 2008 Allison A40 TCM

Price: $675.00
Sale Price: $641.25
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