6L80e, rough/delayed downshifts
Thread Starter
Teching In
Joined: May 2012
Posts: 4
Likes: 1
6L80e, rough/delayed downshifts background:
Been lurking here for awhile, just purchased a 2011 escalade, went through and changed all my fluids so I had a baseline. Transfer case fluid had no semblance of red coloring whatsoever when I changed it, so I'm wondering if it was too late.
Tranny fluid was dark red, didn't smell burnt, and carfax showed that it was changed at 70K miles. Car currently has 140K.
I changed the transmission filter, then flushed the fluid via the clear hose in the radiator cooler port method, ended up using 12 quarts in all, filled it, drove it, and checked and added as necessary.
I have a significant back road commute to work, and I've been noticing as I'm coming to a stop or near stop, the transmission (I assume, maybe transfer case?) is clunking/hard shifting down, banging into a lower gear, noticeably so. It doesn't happen all the time, but often enough to be concerned. I don't seem to notice anything out of the ordinary when it upshifts though, when I punch it, it seems to shift firmly and smoothly through all gears.
I've checked and double checked the fluid level, but I'm starting to wonder if the lack of maintenance from the PO might require a rebuild.
Thoughts?
Been lurking here for awhile, just purchased a 2011 escalade, went through and changed all my fluids so I had a baseline. Transfer case fluid had no semblance of red coloring whatsoever when I changed it, so I'm wondering if it was too late.
Tranny fluid was dark red, didn't smell burnt, and carfax showed that it was changed at 70K miles. Car currently has 140K.
I changed the transmission filter, then flushed the fluid via the clear hose in the radiator cooler port method, ended up using 12 quarts in all, filled it, drove it, and checked and added as necessary.
I have a significant back road commute to work, and I've been noticing as I'm coming to a stop or near stop, the transmission (I assume, maybe transfer case?) is clunking/hard shifting down, banging into a lower gear, noticeably so. It doesn't happen all the time, but often enough to be concerned. I don't seem to notice anything out of the ordinary when it upshifts though, when I punch it, it seems to shift firmly and smoothly through all gears.
I've checked and double checked the fluid level, but I'm starting to wonder if the lack of maintenance from the PO might require a rebuild.
Thoughts?
I have a friend that is the transmission tech at a Chevy dealer and he deals with this on a regular basis. There is a procedure to fix it. He has to flash the computer with his tech 2 then takes it on a drive to get the trans to relearn the proper Shift points or something. He does these everyday as it is very common issue.
Thread Starter
Teching In
Joined: May 2012
Posts: 4
Likes: 1
I have a friend that is the transmission tech at a Chevy dealer and he deals with this on a regular basis. There is a procedure to fix it. He has to flash the computer with his tech 2 then takes it on a drive to get the trans to relearn the proper Shift points or something. He does these everyday as it is very common issue.
