I have 96 Chevy Tahoe 4 x 4 with transmission issues also. My transmission which is a automatic would shift like it suppose to from first to second gear and it would not want to shift fm second to third. sometimes I could manually shift and sometimes not mostly not. when it would shift to third, fourth would shift like it suppose to with no problem. wel now it wont shift to 2nd unless you floor it then let off the gas it will shift but thats it. A friend said it was my solenoid shifter. where are the located and is that something an average mechanic do?

SOURCE: Code Reader reads Shifter Solenoid Stuck or Off

The Shift solenoids are located in the transmission oil pan. I would recommend replacing both shift solenoids while you're in there. Also replace the filter and pan gasket. The shift solenoids are located towards the rear of the valvebody and will be identical to each other. They are held in place by a retaining clip which is easily removed with a small screwdriver or similar tool. Care must be taken as parts may fly out of the bore when the solenoids are removed. Hope this helps.

SOURCE: Hi, I have a 1998 Chevy 3/4 ton 4x4, automatic

Yes, you are correct. i would change the filter as well. check the torque converter for stress.

SOURCE: 1998 chevy k1500 4x4 4

first of all your truck is already in first gear when your going down the road....lol

SOURCE: Transmission won't shift!

Does it just not shift up to 3rd or when it shifts to 3rd it is just like neutral?

SOURCE: It's an automatic but it won't shift from 2nd to 3rd.

You're a *******