2002_Z28_Six_Speed

iTrader: (20)

My 4L65E has 196K miles on it. Almost all highway from numerous East coast to Midwest trips. Been driving with these issues for awhile but my tranny is a bastard that never wants to fully die. But really that is a good thing.

On light throttle 1-2 shifts are rough enough to bob your head but not quite a shift kit feel. Wife "notices." Doesn't bother me as much but I notice. Shift feels fine under aggressive driving. I put it into 2 when in rush hour to avoid this.

2-3 shifts are ok under very light throttle. 500 rpm flare under almost all conditions. Don't seem to notice a flare under WOT. Seems weird to me.

3-2 and 2-1 shifts are very harsh.

All my calibration tables are stock except for that I elevated some of the low throttle shift points to keep the engine rpm from getting too low due to the higher idle rpm of the camshaft. Restoring a total stock cal does not change performance.

Anyways. Are there any wear items in the 4L65E that could be causing this and is it possible that the tranny could be serviced installed in the car? I am thinking here of replacing shift solenoids or maybe some valving in the valve body is worn? I might try to fix this issue. Planning a tranny swap eventually but if she still rolls why mess with the swap. At least until the beast dies. Plus if I fix it and swap later at least I have something to sell in good working condition.

Wolftrk99

iTrader: (5)

Pull history codes and see if yure getting a p1870 or wanna say p0894 sounds like a valve body issue and im drawing a blank as to the exact valve at the moment.... But there is a tsb on harsh 1-2 shaift and setting the p1870/p0894 gm has an updated valve body

1FastBrick

iTrader: (17)

At 196K, you're surely going to want to pull it down and look at your clutches.

I am sure the Valve body could use a rebuild as well as the pump.

You could also get a reman unit through GM or a GM supplier for around $1600 with exchange. Comes with a Warranty.

Wolftrk99

iTrader: (5)

Agreed missed the 196k

2002_Z28_Six_Speed

iTrader: (20)

haha. It is ok to miss the 196K miles. Most people miss it in person as well.

I will check into the codes. I think a reman at 1600 dollars is out of the question when I can get a working 4L80E for cheaper than the reman.

My big questions right now are how much longer can I keep the 60E alive and am I at risk of getting stuck in traffic or is it likely I will be able to limp it home when the time comes. I say this because I noticed the shift flare about one year ago (lol) but I don't daily the truck anymore. I take the bike unless I see snow.

Wolftrk99

iTrader: (5)

I think id look into the history p1870 codes being set and if its there try to repair it, as mentioned there is a tsb on it.... And the harsh 1-2 and flare if memory serves are the most notable symptoms....

2002_Z28_Six_Speed

iTrader: (20)

Just came back from outside. The codes were not set and they are enabled in my tune file. So either they just aren't getting set or because I don't drive it often the codes aren't there from the last time I used it. I will check again after my next drive. I haven't seen a MIL in ages, though.

Wolftrk99

iTrader: (5)

Usually doesnt set a hard code usually just a history code and 2 or 3 drive cycles without will clear the code, very rarely does the light vome on because of it....