Driveline freeplay
#1
Driveline freeplay
Hey gang,
I know this was adressed (sorta) in a recent thread, but I'n not seeing any real answers. My wife's '08 has distinct freeplay or slack in the driveline. It does NOT clunk going from reverse to drive, or during hard braking or cornering. But coming off the gas for a slower driver, it clunks when you accelerate. The harder you hit the gas the heavier the clunk.
The shop where I get the oil changed talked me into changing out the u-joints. I did it because they have 120k on them but I knew that wasn't the issue. Guy actually showed me the slack, I could see that the entire driveline was moving, and there was no detectable movement between the u-joints and the yokes. But they're done now.
My '04 with 150k on it doesn't do this. Is it just a 6.2/6L80 thing? Is there a backlash adjustment for this? I had the tranny flushed hoping it would improve it some, but no luck there. Mulepic said this in another thread: "I have this issue in my 2008. I'm starting to accept the fact that it's 'normal'. But I think it's either the tranny or the chain in the transfer case. I've replaced my u-joints on the front and rear driveshafts."
So there's that, too. I've tried to research the transfer cases to see if they are the same on all year models but haven't found anything conclusive yet.
I don't want to just live with this, especially since I'm looking at trading the '04 for another '08. So looking for ideas from the community. Any help would be appreciated.
I know this was adressed (sorta) in a recent thread, but I'n not seeing any real answers. My wife's '08 has distinct freeplay or slack in the driveline. It does NOT clunk going from reverse to drive, or during hard braking or cornering. But coming off the gas for a slower driver, it clunks when you accelerate. The harder you hit the gas the heavier the clunk.
The shop where I get the oil changed talked me into changing out the u-joints. I did it because they have 120k on them but I knew that wasn't the issue. Guy actually showed me the slack, I could see that the entire driveline was moving, and there was no detectable movement between the u-joints and the yokes. But they're done now.
My '04 with 150k on it doesn't do this. Is it just a 6.2/6L80 thing? Is there a backlash adjustment for this? I had the tranny flushed hoping it would improve it some, but no luck there. Mulepic said this in another thread: "I have this issue in my 2008. I'm starting to accept the fact that it's 'normal'. But I think it's either the tranny or the chain in the transfer case. I've replaced my u-joints on the front and rear driveshafts."
So there's that, too. I've tried to research the transfer cases to see if they are the same on all year models but haven't found anything conclusive yet.
I don't want to just live with this, especially since I'm looking at trading the '04 for another '08. So looking for ideas from the community. Any help would be appreciated.
#2
This may help.
Some customers may comment that the vehicle has a “Tip In” low speed clunk in first gear when the throttle is applied and released in normal “D” drive. Other customers may comment on an engine braking sensation at low speeds in normal “D” drive.
<a id="d98898e24">CorrectionA revised transmission calibration has been developed to address these issues. Reprogram the transmission control module (TCM) with updated calibration files using the TIS2WEB Service Programming System (SPS) application. As always, make sure your Tech 2® is updated with the latest software version.
Some customers may comment that the vehicle has a “Tip In” low speed clunk in first gear when the throttle is applied and released in normal “D” drive. Other customers may comment on an engine braking sensation at low speeds in normal “D” drive.
<a id="d98898e24">CorrectionA revised transmission calibration has been developed to address these issues. Reprogram the transmission control module (TCM) with updated calibration files using the TIS2WEB Service Programming System (SPS) application. As always, make sure your Tech 2® is updated with the latest software version.
#4
Thanks. Found the rest of it over on elcova. Be nice if I could join that one...
Hi sounds like most dealers, remember it was only a $60,000 truck hehehe, their is a program update for some 2008 i had it done. I had to tell the dealer their was a TSB for the trans because they did not know about it. After i told them they checked for the TSB then they would reprogram it for me. This TSB will not be your problem but here is the TSB below. The dealer will not tell you about it you must bitch about the trans clunking in first gear when the throttle is pushed then released. Then they will reprogram it.
TECHNICAL
Bulletin No.: 08-07-30-012
Date: March 13, 2008
Subject:
6L80 Automatic Transmission - Tip In Low Speed Clunk in First Gear When Throttle is Applied and Released, Engine Braking Sensation at Low Speeds (Reprogram TCM)
Models:
2008 HUMMER H2, H2 SUT
with 6L80 6-Speed Automatic Transmission (RPO MYC)
Condition
Some customers may comment that the vehicle has a "Tip In" low speed clunk in first gear when the throttle is applied and released in normal "D" drive. Other customers may comment on an engine braking sensation at low speeds in normal "D" drive.
Correction
A revised transmission calibration has been developed to address these issues. Reprogram the transmission control module (TCM) with updated calibration files using the TIS2WEB Service Programming System (SPS) application. As always make sure your Tech 2(R) is updated with the latest software version.
Warranty Information
So I guess I'll call the local GM boys and see if they can do this. Thanks.
Hi sounds like most dealers, remember it was only a $60,000 truck hehehe, their is a program update for some 2008 i had it done. I had to tell the dealer their was a TSB for the trans because they did not know about it. After i told them they checked for the TSB then they would reprogram it for me. This TSB will not be your problem but here is the TSB below. The dealer will not tell you about it you must bitch about the trans clunking in first gear when the throttle is pushed then released. Then they will reprogram it.
TECHNICAL
Bulletin No.: 08-07-30-012
Date: March 13, 2008
Subject:
6L80 Automatic Transmission - Tip In Low Speed Clunk in First Gear When Throttle is Applied and Released, Engine Braking Sensation at Low Speeds (Reprogram TCM)
Models:
2008 HUMMER H2, H2 SUT
with 6L80 6-Speed Automatic Transmission (RPO MYC)
Condition
Some customers may comment that the vehicle has a "Tip In" low speed clunk in first gear when the throttle is applied and released in normal "D" drive. Other customers may comment on an engine braking sensation at low speeds in normal "D" drive.
Correction
A revised transmission calibration has been developed to address these issues. Reprogram the transmission control module (TCM) with updated calibration files using the TIS2WEB Service Programming System (SPS) application. As always make sure your Tech 2(R) is updated with the latest software version.
Warranty Information
So I guess I'll call the local GM boys and see if they can do this. Thanks.
#6
My 09 w/ the 6L80e is doing the same thing. It's really bad. I can't even accelerate normally anymore. I go into overdriver or 2nd overdrive a LOT, along w/ this awful cluck going from breaking to giving it a little gas.
Maybe this is the fix.
I'm curious how much this is & if it's worth even doing if I'm going to be swapping out the power train anyways.
Please update the thread once you have it done. Oh & do it soon.
Maybe this is the fix.
I'm curious how much this is & if it's worth even doing if I'm going to be swapping out the power train anyways.
Please update the thread once you have it done. Oh & do it soon.