[W126 Coupe] transmission problem

[Gordon Opp]

My 1989 SEC shifts down to 3rd gear for no reason at most any speed above 45 mph.  It won't shift back to 4th unless I put it in neutral and then back to drive or come to a complete stop.  I disconnected the electric shift wire at the rear of the transmission on the passenger side.  That did not alleviate the problem.
   
  Can I assume that this problem has nothing to do with my first gear start module?  Any other suggestions?  Do I have a bad tranny even though the car only has 66,000 miles.  It was serviced at 40,000 miles several years ago.  The fluid looks and smells fine.
   
  Thanks for any ideas.
   
  Gordon Opp
  Lincoln Nebraska, now with coach Pelini leading our football team.
   
   
   
   
    
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