My truck is shuddering in overdrive when driven at constant speeds and constant loads. Pressing the gas to take it out of lockup results in a harsh release of the clutch. No codes found. I have a scanner that reads transmission, abs, airbag, etc. At 55mph, constant load, level ground (for...

Hi All, For my first post here, I'd like to get some input on what I might be dealing with. I got my 08 Trailblazer LT (4.2) about a year ago, and ever since I've been dealing with the TCC intermittently locking/unlocking over and over, along with some other shifting issues. The TCC...

I have a 02 Trailblazer with I6 and automatic tranny with 98xxx miles. When the vehicle is cold I have a whining sound (kind of like a fan rubbing up against something which sounds like it is coming from the Tranny) that starts just before shift and last through the shift. As the vehicle...