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Cc Bucking Slowing Down 50-40 Mph


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#1 STex

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Posted 13 June 2010 - 12:23 PM

I posted a good while back about a bucking issue when slowing down. Around 50 to 40 mph…slowing at a fair rate, some braking and the truck will buck like a real rough down shift. But a shift to manual and it will still be in 6th gear? Dealer says no tsb on it and thinks it is the programming and not a drive shaft issue. Says others have complained. Trouble is it does not always do such, just time to time, mainly when higher outside temps. Has done it since new…

Anyone have such an issue or heard of a tsb? CC, 5.3 4x4. Thanks

#2 BLev

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Posted 13 June 2010 - 01:40 PM

My truck is doing the same thing occasionally. I have also noticed that it will do it sometimes when I stop accelerating and just "coast" in the 40-50 mph range, usually when on a slight down grade. Its almost like the trans starts to shift but then decides it wasnt a good idea?!?

Havent made it to the dealer to ask about it. Would love to know what you find...
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G-80 Locker - 3.42 Gears
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#3 Super Stealth

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Posted 13 June 2010 - 02:02 PM

There is a TSB on a condition similar to this, so here it is

#09-07-30-004B

6-speed shifting issue, dealers are to replace 3 clutch fluid seal rings, inside the trans

Warranty time is 4.8 hours to do. Trans has to come out.

We did a handfull at the dealership where I work, not bad to do

1-2-3-4 and 3-5-R seal rings get replaced.

Edited by Super Stealth, 13 June 2010 - 02:09 PM.

2010 CHEVROLET SILVERADO
EXTENDED CAB,STANDARD BOX
LIFE IS GREAT WITH THE 4.8

#4 CoryFount

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Posted 13 June 2010 - 02:07 PM

There is a TSB on a condition similar to this, so here it is

#09-07-30-004B

6-speed shifting issue, dealers are to replace 3 fclutch fluid seal rings, inside the trans

Warranty time is 4.8 hours to do. Trans has to come out.

We did a handfull at the dealership where I work, not bad to do

1-2-3-4 and 3-5-R seal rings get replaced.

is this for the 6l80e a6 transmission?
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09 GMC SLT 6.2l L9h CrewCab 4x4, K&N CAI, HP Tuned by me.......

#5 Super Stealth

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Posted 13 June 2010 - 02:10 PM

There is a TSB on a condition similar to this, so here it is

#09-07-30-004B

6-speed shifting issue, dealers are to replace 3 fclutch fluid seal rings, inside the trans

Warranty time is 4.8 hours to do. Trans has to come out.

We did a handfull at the dealership where I work, not bad to do

1-2-3-4 and 3-5-R seal rings get replaced.

is this for the 6l80e a6 transmission?



"6-speed shifting issue..." Yes, for the 6-speed auto...
2010 CHEVROLET SILVERADO
EXTENDED CAB,STANDARD BOX
LIFE IS GREAT WITH THE 4.8

#6 STex

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Posted 13 June 2010 - 02:18 PM

Thanks SS, does anyone have the ability to post this TSB? If not I will visit my friends shop and his all data.

#7 STex

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Posted 14 June 2010 - 07:09 AM

There is a TSB on a condition similar to this, so here it is

#09-07-30-004B

6-speed shifting issue, dealers are to replace 3 clutch fluid seal rings, inside the trans

Warranty time is 4.8 hours to do. Trans has to come out.

We did a handfull at the dealership where I work, not bad to do

1-2-3-4 and 3-5-R seal rings get replaced.


Anyone seen this TSB or notice?

#8 kdixer

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Posted 14 June 2010 - 08:31 AM

There is a TSB on a condition similar to this, so here it is

#09-07-30-004B

6-speed shifting issue, dealers are to replace 3 clutch fluid seal rings, inside the trans

Warranty time is 4.8 hours to do. Trans has to come out.

We did a handfull at the dealership where I work, not bad to do

1-2-3-4 and 3-5-R seal rings get replaced.


Anyone seen this TSB or notice?



Anyone know what year and model vehicles this TSB pertains to? In other words when was this issue addressed during production?
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#9 STex

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Posted 14 June 2010 - 09:21 PM

el bumpo

#10 caddycruiser

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Posted 14 June 2010 - 10:13 PM

Mine does this as well, again at random, different days, different temps, random.

Also shudders/shivers under acceleration/cruising at random, another thing I didn't experience with a year and 15k miles on the same 6L80E trans in my G8 GT, but alas. Tuned and back to stock, same thing.
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#11 BLev

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Posted 16 June 2010 - 05:33 AM

Thanks SS, does anyone have the ability to post this TSB? If not I will visit my friends shop and his all data.



Please update us on what you find...
2013 GMC At Sandy Neck


2013 GMC Sierra 1500 CC SLT
5.3L V8 6 Speed Transmission
G-80 Locker - 3.42 Gears
LineX OTR, Weathertech Front/Rear, Access Roll-up Tonneau, Recon Line of Fire


#12 STex

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Posted 16 June 2010 - 07:46 AM

We did a quick search late yesterday and could not find it...will be there today with more time..

#13 STex

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Posted 16 June 2010 - 08:00 AM

Went to all data at home and found 09 07 30 004A not 004B..it was titled A/T shft flare/harsh 2-3 shifting??? Could not read at home will go to shop...does not look like the issue we are seeing..

#14 BLev

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Posted 17 June 2010 - 05:22 AM

Thanks for the efforts -

My truck has developed a bit of a clunk in the front end on moderate size potholes (love New England) so I will be headed to the dealer next week to let them figure it out (sounds like a bushing). I will see what they say about the trans issue too.
2013 GMC At Sandy Neck


2013 GMC Sierra 1500 CC SLT
5.3L V8 6 Speed Transmission
G-80 Locker - 3.42 Gears
LineX OTR, Weathertech Front/Rear, Access Roll-up Tonneau, Recon Line of Fire


#15 STex

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Posted 17 June 2010 - 07:12 AM

Let us know...hope thsy know more than my dealer..mine says it is in the programming and no fix out yet???

Note, mine is random but drove in auto 4 for a few days and no such problem??

Edited by STex, 17 June 2010 - 07:14 AM.





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