2004 Dodge 3500 tranny problems?
 

I just recently bought a bone stock 2004 dodge ram 3500 cummins srw. It has 180k miles on it and last night I drove about 30 miles away and on the way back home it started shifting weird. Now if I put it in drive it never shifts out of first and won't go over 20 mph without red lining. I'm new to the dodge cummins world so any help would bee greatful! I use this truck everyday to drive to work and also to haul my horses around.

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Does anybody ever respond? I need to find this out ASAP please my truck is needed everyday

Thanks for no help...took matter into my own hands and ripped the whole trannt apart