Transmission stuck in 2nd

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Kord

Newbie
Joined
May 29, 2016
Messages
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Location
Idaho
Hey ya'll, so I just picked up a 1994 chevy suburban with the 350 engine and 4l60e. When I put it in drive it feels like its stuck in second or third gear. It takes off slow like its under powered then drives fine around 20-30 then gets up to 3k-35k rpms if your faster like around 50mph. I thought the tranny was messed up so I tried putting it into 1,2,3 gears manually they all worked fine. Just wondering if i can get some help on when its not shifting when I am in drive. I called a few local shops and was told it could be the TPS sensor or ignition switch is bad and not giving the tranny the correct voltage. Any ideas or where to start?
Thanks!
 
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