my 01 dodge 4x4 with a cummins diesel is starting off its shifting cycle in 2nd gear and shifts fine into drive and overdrive,but i can't even manually shift it into 1st gear.leaving the stop sign its starting off in 2nd and proceeds to shift fine.NO 1ST GEAR. this truck only has 103000 miles on it. oh reverse is fine also. need advice. thanks wjr