I am having transmission issues and its driving me crazy. It started with my truck didnt wanna shift out of 1st, drove it about 1/4 mile and finally shifted, then once it shifted it didn't wanna go to 1st it just took off in 2nd gear, well now it's staying in first again but I can get the rpms up high enough to where it will shift to 3rd if I feather the pedal just right, once the tranny gets to operating temp it will shift into every gear just fine. Please if anyone has any info please help.. Thank you p.s my truck is a 06 Cummins 2500 4x4 no mods