I have a 2017 GMC Sierra 5.3 with the 6L80E. Needless to say my transmission is shot on it already. Unfortunately I am out of warranty so all cost will be coming out of pocket. I’ve shopped around locally and all shops range from $3,000-$7,200 to rebuild mine.(Tucson,Arizona) so I started looking for some remanufactured transmissions online. I would like some opinions and some sites you have used before. Street smart transmissions/ Best Buy Transmissions/ GM factory remanufactured.