wjburken
Supporting Member
What particular issues are you referring too?
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
- Thread starter phattyford
- Start date
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Ilikemtb999
Full Access Member
Pump issues which led to harsh shifts. They updated in I believe 09-10, somewhere in there. They also have converter issues and pressure control solenoids fail with decent mileage.
Those are known issue's in general with the 6l80 never heard of it being associated with any particular years
wjburken
Supporting Member
It’s more of a tomorrow thing, but I’m pretty sure our 2013 has a bad front passenger side wheel bearing. It started out as a kind of whine a couple days ago my wife said, but when I drove it tonight, it’s really growling. Louder on left turns almost gone on right turns and gets louder when going through dips. Haven’t got it up on a jack to wiggle and spin the wheel yet, but I’m pretty sure that’s what it is.
Fortunately, I have a spare from a previous project so it’s probably getting put on tomorrow night.
Fortunately, I have a spare from a previous project so it’s probably getting put on tomorrow night.
Ilikemtb999
Full Access Member
Considering they updated the pump I’d say the earlier ones had an issue newer ones do not (mechanically not in the tune). There was also a TSB for clutch seal rolling/leaking on the earlier ones and was supposedly the cause for flare ups/hard shifts.
swathdiver
Full Access Member
The 2500 wagons in 2007 had the 4L80. They got the 6L90 the next year. Don't remember about the HD Pickups.
Ilikemtb999
Full Access Member
07 was the split between nnbs and classics. HD gassers got 6l80’s.
I was asking about the 07-08 Denali’s that got the 6l80 but then I was told I was wrong so.
must be so then I just was told it was the common problem, when I was shopping for mine I completely skipped 07-09 and concentrated on the 2010's+ mostly because of wider range of parts compatibility later on down the road.
swathdiver
Full Access Member
Haven't noticed any year to year problems with the 6L80 mentioned on the forums but have seen production changes to improve things.
Ilikemtb999
Full Access Member
I had an 07 2500HD and had flares pretty regularly. Ended up selling it as it wasn’t a good fit for what I needed but that truck could of benefitted from a tune at the very least.
