06 48RE Software upgrades

[jelag]

There has been some issues around the 06 and software upgrades... I ran across the following information, but can't tell you when in the 06 production it took effect..... Hope this helps sort out some of the issue's around using exhaust brakes on the 48RE.............

06 Dodge Trucks with 48RE Transmissions
Dodge has made changes to the software within the engine and transmission computers. These changes do not allow the exhuast brake to be activated until the torque converter lock-up clutch is fully applied. When the exhaust brake is activated the new software is designed to downshift the transmission from 4th to 3rd gear when conditions allow. The exhaust brake will disengage during downshifting as teh torque converter drops out of lock-up, it will not be re-applied until lock-up is acheived.

Downshifting from 4th to 3rd is accomplished by depressing the "tow/haul" button, a 3rd to 2nd gear downshift is accomplished by moving the shifter lever to 2nd. Downshifts will not occur until the RMP is low enough to prevent engine over-speed. Fixed orfice exhaust brakes require downshifting to provide high engine RPM to enhance performance. The PacBrake PRXB does not require the devel of downshifting do to the backpressure regulation.

Note: the new software and treasmission design does not provide effective retarding in first gear.....