Thread: p1811 or p01811 on 03 grand prix se 144,000mi 4t65e transmission

Why'd you replace the trans cooler? Unless it was failing/leaking, or you decided to start towing things around, there's no gain, and only $ loss when replacing them. Not that I wouldn't do it if it was something to keep my engine looking prettier lol.

Nevermind the last post. Just did my shift kit today (solenoids and pressure switch this weekend) and because of your thread I picked up a new cooler... didn't put it in yet 'cause I was feeling lazy, but I got one lol. Shift kit installation was a breeze, and ~$100 worth of Lucas AT fluid later, the p1811 is bandaided up and shifting smooth and quick like the good ol' days.