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  1. 02 Duramax won't go in forward gears - Help!

    911 Problems Forum
    This happened all of the sudden. I can go in reverse all day long but no forward D321 will work. When selecting the range it'll think a few seconds then the box highlighting the selected range will flash. Happens in all forward gears. I thought enough online searching suggested the NSBU aka...
  2. wont shift, no speedo, an no gear selector

    Transmission Shop
    I started my truck this morning and the gear selector didn't light up on the gear I was in than putting it in rev it slammed into gear an did the same in drive, also won't stift out of 1st, a guy told me that their is a switch on the side of the tranny does anyone know what the name of it is I...
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