not shifting out of 1st gear

I have a 99 Dod Ram 1500. It`s not wanting to shift out of 1st. Rpms go up & I have to let off gas. Then it shifts into 2nd. Could this be an O2
sensor ?
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i have the same problem in my 97 dakota, except its with second gear, it only seems to do it when everything hasnt warmed up yet.
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No.... it's most definately not an O2 sensor...
It could be that the front band is out of adjustment, and letting the front drum slip under higher engine power. It could be a faulty TPS sensor, thinking you're at WOT, and letting the engine wind out in 1st. It could be a mis-adjusted (too-tight) TV cable, delaying the upshift because of higher line pressure.
Check the band and TV cable adjustments first, because they're mechanical and easy to check. If that doesn't do it, back-probe the TPS with a multi-meter (analog preferred), and check the output voltage in reference to the throttle position - see if it's incorrectly reading WOT at a partial throttle setting.
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VSS
replace it and get on with life

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