1985 300 SD - Trans won't shift past 3rd (Full Version)

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1985 300 SD - Trans won't shift past 3rd


  

cnlcpa89 -> 1985 300 SD - Trans won't shift past 3rd (5/31/2008 10:29:57 AM)

My 300 SD won't shift past 3rd gear.  It shifts fine for through the first couple gears and that's it.  I also have to keep it in 3rd or it just revs up really high but doesn't move or it jerks back-and-forth into third as it slows down.  Also, my tach isn't working.  The trans fluid looks good.  I was thinking it may be a speed sensor or RPM sensor, but they aren't cheap parts.  I would like to know what you think before I start replacing expensive parts.

Thanks,

Chris


  

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