Transmission TSB - day 2

[Boardmember]

Ok, my local Chevy dealer did his 2nd manufacturer-recommended service for my hard up/down shift in gears 1-2-3.

 

The first was a standard reflash a couple months ago. He said yesterday's was the new TSB and he described watching the mechanic hold the brake, gun the throttle and follow instructions as directed.

 

Responses observed:

 

The slow roll to a stop, then accelerate before stopping extreme clumk is gone so far.

 

Minor 3-2-1 clunks coming to routine stops. Perceptible, but minor.

 

The truck feels heavier off the line. No hard acceleration, but routine starts almost seem a touch sluggish.

 

I've tried to watch RPM shift points, but too early to tell much. I am keenly aware of my (manually calculated) MPGs. I'll watch that too.

[seamus2154]

8 speed or 6 speed??

[redwngr]

avatar says 5.3 8 spd

[mcoble54]

My truck has been at my dealer for this last week for this exact issue. I called them today and they said they're still working on it but haven't solved it yet. Please update your results if you can!!

[Boardmember]

Ok, will do. The bullet points in first post are all for the moment. I might assume it's still in the "learn mode" so actual results may be yet determined. Yes, 8 speed.

 

If this was a shift point re-program, I have to think my MPG will be negatively affected. I manually calculate every fill up (use trip B for this) so I'll get a feel soon.

 

Clearly, I want this to work...