Hi all. I am chasing a harsh 3-2 downshift on my 2008, 4x4 with 26,000 miles. It is basically just like the old tsb for a harsh shift on tip in at low speeds on trucks built mid way through 05. There was a Special service message that stated a intermittent transmission clunk on 3-2 downshift that was normal then a TSB later released to reprogram the PCM for the 04' and 05' trucks. My problem is the dealer is trying to reference the old SSM & TSB and tell me it's normal. They did reprogram the PCM which didn't eliminate it and I have put over 1,000 miles on it since so it should have "learned" my driving. I know 2 other people with the same 08' truck as me that do not do it. I guess what I am asking is: 1.)Is this normal or not? 2.)Anyone had this problem with a post 2005 and get it fixed? Thanks for any help

 

I have what sounds like a similar problem in my 08 4x4 with 30000 miles. While driving 25-30 mph, with my foot gently on the accelerator (starting to slow down in subdivision), the rpms will shoot up then there will be a slight clunk.... like it slipped out of gear then back in again. I am taking it to the dealership on Monday to get it looked at while I am still under warranty. I had it in one other time for this problem and they told me it was a bad COP. It obviously didn't resolve the issue. Good luck 02RegularCab4x4. Have you found anything out about your truck?

 

Got my truck back today. The ticket says they diagnosed and reprogramed the PCM as per TSB 9-14-3. Hopefully, that did the trick.

 

CJB & OP:

I had my 08's PCM reprogrammed about 7 months ago for the same identical thing that CJB notated. It has yet to happen again, and I am sure that it fixed it.

OP: try a different dealership if possible.

Nitrox.