Transmission slippage

2003 GMC SIERRA
374,000 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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KLBILL
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In all gears when lightly accelerating I seem to have the engine rev up (slip) always from 2200 rpm to 2600 rpm.
If I accelerate hard there seams to be no slippage. Is this needing a transmission re-build or does the torque converter need replaced?
Jul 20, 2017 at 5:52 AM
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HMAC300
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first scan for codes, but with your description i would say time for a rebuild especially with miles on it. does it slip in all gears or just one? a transmission professional can diagnose this fairly quick as most of these have the same problems. See link.
https://www.2carpros.com/articles/automatic-transmission-problems

You could try a transmission service but I doubt it will help much and additives do not work in my opinion.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
Jul 20, 2017 at 8:27 AM