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I replaced the regulator with a motor for the driver's side rear on my wife's 2011 with parts from 1AAuto.com two years ago. It does just fine, no issues, rolls up just as fast and strong as an OEM one does.
aftermarket regulators are usually fine as long as it's not the bottom of the barrel brand, it's the motors you have to watch out for, the repops have a lot more plastic gear parts so they fail sooner.
I changed the LR Regulator on my bride's 2013 Tahoe with a Dorman replacement several years back and it's worked fine so far.
The white nylon/plastic on the OEM unit became brittle and shattered. The Dorman unit has a L/T warranty too.
FWIW - Have also replaced all four outer door handles one by one as they broke with Dorman replacements and they too have all been fine thus far. The Dorman's are also plastic, but have a L/T replacement warranty
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