5.9 Cummins and 48RE Custom Tuning: Performance, Towing and Daily Driving

I’m sure you have heard or read: 48RE shift points can only be adjusted by replacing the valve body or installing a shift kit… This statement used to be accurate but is now FALSE.

I have located engine and transmission tuning parameters not offered in any off the shelf tuning platform.  There are literally thousands of adjustable engine and transmission parameters in the 2003-2007 ECM software and only a handful of those parameters are included in off the shelf tuning programs used by most tuners.

While a shift kit is still a great addition mainly to increase the line pressure and clutch holding power, I assure you the ECM/TCM is in complete control of the shift points in a 48RE Transmission.  The issue is other custom tuning platforms don’t alter the correct parameters to accurately to adjust the shift points… My custom tuning does.

Proof…

5.9 Cummins & 48RE Proprietary Custom Tuning

*In the picture above, the red circle is what sets my tunes apart. This is where my proprietary engine and transmission tuning parameters that other tuners don’t have are located. I use a few different programs to locate these parameters in the code and then import them into the tuning software as seen above.

A Totally Different Driving Experience:

My tunes are a complete package of mated engine and transmission tuning which will provide an unparalleled driving experience.  I provide custom tuning for 3rd gen Dodge Ram trucks with a 5.9 Cummins engine and a 48RE transmission for model years 2003*, 2004, 2004.5, 2005, 2006 and 2007.

*2003 Model Year Trucks do not have 48RE tuning available at this time.

5.9 Cummins Engine Tuning:

  • 2003, 2004, 2004.5, 2005, 2005.5, 2006, and 2007 Year Trucks
  • Increased Horse Power
  • Increased Torque
  • Increased efficiency

48RE Custom Tuning:

  • 2004-2007 Model Year Trucks
  • Raised 1-2 shift point
  • Lockup in Manual 2nd
  • Raised 2-3 shift point
  • Lockup in 3rd gear that holds while coasting
  • locked 3-4 upshift
  • Tow Haul Button converted to Overdrive Off.  (2004-2005 trucks can restore the tow haul maps with an additional switch and 2006-2007 trucks retain tow haul and OD off functions at the button on the shift lever).

How The 48RE Works…

The 48RE is an electronic over hydraulic controlled transmission. The short story is, the electronics control the hydraulics and the hydraulics control the transmission. The long story: the ECM constantly monitors data from sensors located in the transmission and commands key hydraulic pressures which are determined by several electronic tables. Each of these tables get used under specific driving conditions. The ECM determined hydraulic pressures are what physically move the shift valves in the valve body back and forth resulting in upshifts and downshifts.

Hardware upgrades may help to some extent, but they can never fix the real underlying issue of poor factory programming.

By altering the data in the proper shift tables (not just the ones the tuning programs show), the 48RE shift points can be pinpointed based on electronic tuning alone with no valve body modifications.

Have Questions?

Contact me HERE