Here's is DC's reply to my email about the '05 48RE:
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Dear Jim,

Thank you for your email to DaimlerChrysler Motors Corporation concerning your 2005 Dodge Ram SLT 2500 Quad Cab pickup truck.

Unfortunately DaimlerChrysler Motors Corporation currently has no plans to retrofit 2005 48RE transmissions with the overdrive lockout feature.

Thank you again for your email.


Sincerely,

William
Senior Staff Representative
DaimlerChrysler Customer Assistance Center
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As you can see, DC is not going to fix this one unless real pressure is put on them. I'd pay to have it done.