1999 my chevy silverado1500 wont run pass 30 miles per hour un less i swich it to 1st over drive
Sounds like trans issue, take it in and have it checked.
Might be transmission issues or the overdrive itself i would rule the small stuff out first before putting money in a tranny and never needed it
we plug it up to a scanner and it had two sensors the were bad 1bonk and 2 bonk . we clear the codes and run it with the scanner hooked up to it and it run perfect but as soon as I unplugged it started again. so I went and replace them and it still did the same thing.
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