SFLTruck

On my 10L80 the bypass is external and on the passenger side of the trans. I'm thinking yours should be the same as the 3.0 because the trans is exactly the same. If you crawl under and take a look you will see the lines (3 of them) on the TBV. Can you take a look ans see?

That sounds like a TC lock-up issue.

I have a slight vib/rattle to the right of center dash. It only does it just coming off idle and only when it's first started. After about 3 to 5 minutes it goes away. Idle no rattle, light throttle input rattle, RPM goes above 1000 and it's goes away. I don't get the vibration on deceleration passing said RPM range only when accelerating. Makes me wonder if it's exhaust related and once heated tolerances change enough to make it go away.

My rain sense wipers on my 23 work pretty well. As far as reproducing goes, a garden hose should solve that obstacle.

Did you ever get a resolution to your situation?

Same for me on both accounts.

oh that's cool I haven't noticed that one yet.

I think GM is trying to keep owners from using the "parking pawl" in the transmission to hold the vehicle in place on anything other then flat ground. I have noticed the same thing. If the ground if flat it won't engage, park on a hill and it will. Also, I noticed if you're stopped at a light you can press the park button and then you can take your foot off the brake. The truck will stay in place and all you need to do is touch the go pedal and it will turn off the parking brake and you're off.

Wondering if anyone has gotten a resolution on the shutter yet? Also wondering if it's the TC shuttering that was prone to the 8L series?

yup that .1 mpg for the charging algorithm as well. Burn $2 less fuel over 100K miles but toss more batteries in the trash. Oh it's a real green decision.