Torque Convertor Shudder

[mattbta]

Going to repost.

 

[mattbta]

i apparently can’t figure out multiple quotes. Gah

 

[mattbta]

There is a TSB about this recommending a software update and a fluid flush using a certain Mobil One formula that is supposed to reinforce clutch material. I've also read a couple threads where Amsoil was used with positive short term results but haven't gone back to see about long term... Be worth calling Amsoil and Mobile One and speaking with a tech... On one of my flush's dude at AutoZone put 4 jugs of Valvoline in truck bed(thanks to Corona) and 2 were Merc III. I didn't notice until after flush and drive for 50-60mi. Spoke to Valvoline engineer for 40min about fluid compatibility and TCC shudder- very helpful, didn't seem annoyed w/my 101 level questions, etc...

Does said TSB apply to the OP's NBS tranny?

My transmission calibration for my 2004 RWD was 12587979 and as of yesterday is now 12602140. According to TIS, that update is not associated with any bulletin. The comments state “New calibration to address customer complaint of second gear start”.

Do you happen to have the TSB number? Thanks.

 

[5StarCustmSolutns]

Does said TSB apply to the OP's NBS tranny?

Thought of that when typing....Idk. If remembering correctly I don't think it mentioned 4L60, just 6L80? Be worth a call to Mobile One and Amsoil though...and GMTech Detroit(local dealer only tried to get me in, didn't offer verbal assistance)

 

[5StarCustmSolutns]

i apparently can’t figure out multiple quotes. Gah

ME EITHER LOL

 

[5StarCustmSolutns]

My transmission calibration for my 2004 RWD was 12587979 and as of yesterday is now 12602140. According to TIS, that update is not associated with any bulletin. The comments state “New calibration to address customer complaint of second gear start”.

Do you happen to have the TSB number? Thanks.

Didn't save but I'll search right now... stumbled across it in Canadian thread

 

[5StarCustmSolutns]

My transmission calibration for my 2004 RWD was 12587979 and as of yesterday is now 12602140. According to TIS, that update is not associated with any bulletin. The comments state “New calibration to address customer complaint of second gear start”.

Do you happen to have the TSB number? Thanks.

30min in and haven't found a TSB re: 4l60's I apologize for not confirming the TSB was for your transmission before mentioning it. It came to mind while typing, I paused for a second, then kept typing. Was thinking along the lines of the solution suggested of a different formula fluid. That seems to be GM's "fix" for the 6spd/8spd and I thought it relevant enough to mention...

When searching "gm tsb tcc shudder 4l60" there are many links like these though

https://bobistheoilguy.com/forums/threads/4l60e-shudder-lucas-red.38204/

***If your prob is truly TCC this thread reads like these guys have found 2 solutions. Attn: POSTS #5, #6 and #12 IN THIS THREAD

4L60E transmission slipping during lockup

I have a 2002 TrailBlazer 4x4 with 174K miles on it. It has the original trans with a secondary stacked plate cooler added. It has been flushed (draining by opening the cooler line while running until it just runs out and them immediately stopping the engine, filling 4 quarts, and repeating 3...

forums.anandtech.com

XX Check that: 59min in and found this TSB (though it's not the one I was referencing)

05-07-30-017B Chevrolet Technical Service Bulletin

05-07-30-017B Chevrolet Technical Service Bulletin

www.tsbsearch.com

--Thought this might help also

30 Common 4L60E Transmission Problems & Repair | Charlotte NC - Twin Transmission Inc

What is a 4L60E Transmission? The 4L60-E is an automatic shift, four-speed overdrive, longitudinally positioned transmission. It has been considered to be the best rendition of the finest overdrive automatic transmission ever produced. The 4L60-E is found in nearly every GM rear-wheel-drive...

twincharlotte.com

Again, I'm sorry if I got hopes up for a specific confirmed TSB solution......but I would think there are more than just the one linked above able to be found with TSBSearch.com though.

 

[mattbta]

30min in and haven't found a TSB re: 4l60's I apologize for not confirming the TSB was for your transmission before mentioning it. It came to mind while typing, I paused for a second, then kept typing. Was thinking along the lines of the solution suggested of a different formula fluid. That seems to be GM's "fix" for the 6spd/8spd and I thought it relevant enough to mention...

When searching "gm tsb tcc shudder 4l60" there are many links like these though

https://bobistheoilguy.com/forums/threads/4l60e-shudder-lucas-red.38204/

***If your prob is truly TCC this thread reads like these guys have found 2 solutions. Attn: POSTS #5, #6 and #12 IN THIS THREAD

4L60E transmission slipping during lockup

I have a 2002 TrailBlazer 4x4 with 174K miles on it. It has the original trans with a secondary stacked plate cooler added. It has been flushed (draining by opening the cooler line while running until it just runs out and them immediately stopping the engine, filling 4 quarts, and repeating 3...

forums.anandtech.com

XX Check that: 59min in and found this TSB (though it's not the one I was referencing)

05-07-30-017B Chevrolet Technical Service Bulletin

05-07-30-017B Chevrolet Technical Service Bulletin

www.tsbsearch.com

No worries. Appreciate the links. Thank you.

 

[5StarCustmSolutns]

No worries. Appreciate the links. Thank you.

Leave you with this for now: Just read on HotRodder regarding the 30 issues w/4L60 link above

Issue Number 25: Torque converter shudder in 4th while lockup is engaged; problem goes away when the brake pedal is pressed slightly to unlock converter: Need to verify line pressure, and provided no valves in the TCC (Torque Converter Clutch) hydraulic circuit are worn, replace the torque converter.

The next time it shudders in 4th (OD) tap the brakes enough to disengage the torque converter lock up, but not engage the brakes. IF the shudders stops this shows the TC is the cause. IF no change then the issue is going to be in the pressure regulation, which could be solenoid or in the Valve Body.

 

[Blackcar]

Leave you with this for now: Just read on HotRodder regarding the 30 issues w/4L60 link above

Issue Number 25: Torque converter shudder in 4th while lockup is engaged; problem goes away when the brake pedal is pressed slightly to unlock converter: Need to verify line pressure, and provided no valves in the TCC (Torque Converter Clutch) hydraulic circuit are worn, replace the torque converter.

The next time it shudders in 4th (OD) tap the brakes enough to disengage the torque converter lock up, but not engage the brakes. IF the shudders stops this shows the TC is the cause. IF no change then the issue is going to be in the pressure regulation, which could be solenoid or in the Valve Body.

Would driving in tow mode also verify that also. I have been told before that when you feel shutter to watch tach for jumping RPM.