New TSB - Transmission related PCM update

[cdepuydt]

Originally Posted by Pizza Man

Bud, let us know what changes you see with the update.

BTW, my seat is starting to "ROC". The rocking is from front to back, is that what you guys are noticing?

PM, I had the same issue with the drivers side seat in my RL. It was rocking back and forth, especially during quick stops or during hard acceleration from stops. They replaced the seat rails as (I was told) there were some bad welds in the bracket that holds the seat, and one of them had broken away. No problems since.

[Pizza Man]

Originally Posted by MikeT

Seat rails, mine have been replaced (Drivers side), twice I think

Twice?? How long has it been since the last repair, Mike? Hopefully the second time's the charm.

Originally Posted by mdwalls

Joe, right off the bat, I noticed the difference in the shifting when "gliding" through stops. The down shift to low much less noticable. Dan and Mike, after three tries, they claim they still can not duplicate the condition with my drivers seat I described. I told them you can't drive around the parking lot, you need to drive in and out of uneven roads or driveways. So after the New Year, we are going to set up a drive with me there. Bud

I'm happy for you the dealer finally did the upgrade. I noticed the shifting improvement immediately as well. My seat problem is at this point minor. It feels as if the seat is sliding front and back as opposed to rocking. I think I'll need to let it get a bit worse before I take it to the dealer.

Originally Posted by cdepuydt

PM, I had the same issue with the drivers side seat in my RL. It was rocking back and forth, especially during quick stops or during hard acceleration from stops. They replaced the seat rails as (I was told) there were some bad welds in the bracket that holds the seat, and one of them had broken away. No problems since.

I'm happy to hear the repairs has been successful, cdepuydt. Thanks for your input.

[tigertom1965]

I have a 2007 but not sure if it is one that is listed. Where is this listed that tells you what vehicles are covered in 2007?

I had one delayed shift into second (or third) since the 25th of Feb 2008 when I bought it used but I have this weird sensation that as I go down hills it seems to want to shift into high hear than out then in. The hills are not steep they are gentle down hill grades on the highway or in town so speed is not a factor. Almost like the rear catches up to the front and pushes it a little.

Is this also covered by the same tsb??? Or is this something else entirely?

Right now I am getting 20.5 with 87 octane on 70-30 highway/city driving. I sure hope that gets better or stays the same but will welcome any changes in this tranny feeling I get. Overall I am loving the truck just hope this can be fixed since I bought this because I hated all the repairs I had to do with my Chevy's and Jeeps (Crappy quality on the parts used to build these vehicles).

[MikeT]

Tom,

The TSB number is attached for your review. Read the symptoms that the TSB addresses and what you are describing doesn't quite fit. The TSB addresses the downshift from 5th into 3rd (Example; full throttle for passing on the highway) and a very delayed upshift back to 4th or 5th.

The downhill shifting sensation sounds like the grade logic software that causes the transmission to shift into a lower gear under certain circumstances when going downhill in order to make use of compression breaking.

[MikeT]

Originally Posted by Pizza Man

Twice?? How long has it been since the last repair, Mike? Hopefully the second time's the charm.

Seat rocking, mine is back for the third time. If I adjust the front of the seat bottom up / down a little, the rocking stops for a while, then I have to readjust again.