Slow shift to 3rd..

[Shawnf92]

Hey guys, new to the forum. I searched around and didn't find anything quite like this in the forum so, I've got a 04, 5.3, 4l60, problem is, when it's warm, transmission seems to have a little issue shifting into third. It doesn't flare, but when it goes to shift, you feel it shift, then suddenly you feel it engage... Pretty much, RPM drops with the shift, then drops a little more and you feel a stronger engagement. I know these 4l60s have issues with the 3-4 piston and burning clutch packs, but I'm just wondering if this is beginning symptoms of it... Like I said it doesn't flare like I've seen people say on other forums and videos but just shifts slowly and engages suddenly. Any suggestions? Thanks. 

[carkhz316]

What takes place during the the 2-3 shift is that the 2/4 band releases and the 3/4 clutch applies. There could be an overlap in the shift, or an issue with the valve body, but I'm inclined to think this is the beginning of a 3/4 clutch or piston (torn lip seal) failure. It sounds like the clutch is partially applying, and then fully applying, hence the 2-stage shift of sorts.

[AJE]

I only notice mine doing that in tow haul mode... sometimes it will get go up almost to 5k on the tach before it finally shifts.