I was on my way home yesterday evening, and had to stop at an intersection a couple of miles from the house. As I was coasting to a stop the transmission made a noticeable downshift.. which I have never noticed it do before.

I then turned and while accelerating the 1-2 shift seemed late and the 2-3 was late and hard.

The road has a 45mph speed limit and normally the truck shifts into overdrive right around 45, but this time it wanted to stay in 3rd.

As I got into town 25mph streets it still seemed to want to stay in a lower gear than normal.

 

Checked the fluid this morning and it appears normal. decided to go down and check for codes. The truck now runs and shifts normal again, with no codes????

 

I am overdue on the fluid and filter service.

I`m wondering if anyone has seen something like this on 3rd gens??

Filter clogged up and not flowing good so the line pressures are weaker? (Educated guess...)

 

The transmission has 175k  relatively easy miles on it. I usually drive like I have the proverbial egg under the foot pedal, but I do occasionally let the dog eat...  I`m thinking of doing a cascade GP service kit and a band adjustment and see if I can ease another 20k out of her??

 

I really had my heart set on doing some BBi injectors this winter, but both are not gonna be in the budget.

Yes, service kit!

Ordered the governor pressure service kit this morning. I drove the truck quite a bit today and its like it never happened. I`m running about 45k since the last service.

I have to say that I have actually been pretty impressed for a OEM trans so far. Its very smooth under light throttle, and pretty firm when you spool it up.  Then again, it has lived a pretty sheltered life. I just need her to hang on awhile longer before I upgrade.