No Reverse and neutral,NEED ADVICE HELP!!!

[Roosterwolf]

I have No reverse,back-up lights come on but no response with movement,I replaced shift solenoid,Filter,Fluid and a new cable.Still no luck.All adjustments were made and can't figure it out.

---------- Post added at 11:22 PM ---------- Previous post was at 10:00 PM ----------

I got a 1997 SLT Yukon 5.7 4x4...........I got NO Reverse and when I put it in Neutral,the Truck still wants to go.When the dash indicator is in (R) reverse the back-up lights come on,(So the trans is in Reverse,but doesn't go reverse.I replaced a new shift Cable and a 1-2 shift solenoid and a filter with new DexronIII fluid.Still doesn't do nothing. Got good forward power in N,D,1,2,and 3. We all know Neutral is suppose to be Neutral(go nowhere) when gas pedal is engaged,but it wants to go if i let off the brake pedal.What could be the problem??????????? Do I need a new Trans or can it be the other Solenoids. Please Help,Got to get to work Thanks to all that could help

 

[SunlitComet]

Transmissionmission acts like it's in Over Drive in neutral, car is locked stationary in Reverse, engine feels loaded in ark,, all four forward positions work fine Internal crossleak feeding the forward clutches all the time. Most likely a cracked input housing, or cracked forward piston means forward clutches are fused together. Car can safely be driven gently in forward gears until the repair. Remove & replace or rebuild