Automatic Transmission Cooler Problems of Chevrolet Traverse

Ive got this vehicle on 5/12/2025 and all of this need to be done catalytic converter replacement. During inspection found loud exhaust on startup. Upon further inspection found bank 1 catalytic converter cracked causing exhaust leak. Both exhaust front pipes damaged as well(broken mounting brackets between both pipes) . Recommend replacement of catalytic converter and both exhaust front pipesbrake system fluid exchange-performed pressurized fluid exchange of old brake fluid, removed moisture and air contamination from brake system. Installed new dot specific fluid to meet manufacture specificationsautomatic transmission service fluid exchangecf - cooling system service 6830/5881-01 includes flush cooling system, pressure test, check hoses, cap and check connection. Install cooling system corrosion control kit drain old transfer case fluid and replace with new fluid rear differential service this should have been done when the dealership got the vehicle, and it should be gm or berger responsibility. I am sure this was an issue to begin with.

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Transmission started shaking vigorously while slowing down thru residential area at low speed going up a slight incline at about 15 to 25 mph. Engine started to heat. Not a single warning light turned on and never did prior to taking it to the dealership. Vehicle only has less than 86000 miles, & apparently gm has not recalled this vehicle(s) for transmission problem as it appears to be a common problem with these vehicles. I took it to the dealership & they said they reprogrammed the transmission solenoid and took it for a 16 mile test drive. Supposedly, it was fixed. But it wasn't. Multiple reports on the internet say the torque converter is the problem & will fail because of lack of adequate cooling for transmission. Transmission started slipping at 42000 miles from either 1st to 2nd gear or 2nd to 3rd gear.

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