6L80E / 6L90E Tuning - 6L80E / 6L90E Transmission Tuning

Circle D 3200 Triple Disk Shudder

bsmith0948 — Wed, 01 Jul 2026 14:11:52 +0000

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I'm looking for some help troubleshooting what appears to be converter slip. I started working on a TCM tune to lock up the converter in 5th and 6th gear part throttle. We've tried several iterations but consistently get a shudder while cruising in 6th gear, 55-60 mph when commanding zero rpm converter slip. It did not shudder with the stock calibration that was commanding 20 rpm slip.

Vehicle

1976 C25 with an L92 pulled from an Escalade, and a 6l80 pulled from a police Yukon.

Engine mods

BTR LS3 stage 3 cam
Ported heads
High ram intake, 102mm TB
1 7/8 longtubes

Driveline

Circle D 245MM triple disk 3200-3400 rpm stall converter
Stock 6l80 trans
3.73 gears
33" tires

The engine is controlled with a Holley Terminator X Max, there is no factory ECM on the vehicle. The Holley module can flash a basic 6l80 tune but not adjust TCC settings.

The stock read was pulled from the TCM. The OS is 24264923 which I think indicates 2013 camaro (based on a google search). But trans came from a 2008 police yukon. I'm not sure but maybe the Holley rewrote the OS?

These were the updates in the V1 TCM calibration

Lockup disabled in gears 1-4.
WOT lockup disabled.
Regulator gain of 1 and offset of 0 to hopefully smooth TCC apply.
Observations: shudder in 6th gear at 55mph

The shudder remained through several iterations of varying gain/offset/ramp parameters. One observation is that the shudder seems to resolve when commanding lockup through the VCM scanner.

Would you be able to review the tune/log and let me know if anything is clearly missing? I've done a fair bit of 6l80 tuning on my mostly stock silverado. But nothing quite like this.

I've uploaded the TCM tune as read from the TCM, and a tune with the V1 updates.

I've also uploaded a log file using the channels 7 config. Although we are only able to read available TCM parameters.

2010 Camaro CDT LEVEL 3 / Circle D 3200 Triple Disk

chrispearson — Fri, 08 May 2026 01:34:22 +0000

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6L80E / 6L90E Transmission Tuning

Log File from log after cdt level 3 kit and new cooler. Shifts feel good. 3-2 and 2-1 downshifts feel fine but are firm. Upshifts feel about 90% correct now after adding new/better flowing cooler. Let me know what you think sir. I appreciate it!

Fast Learn Aborted

dgann — Mon, 20 Apr 2026 18:05:17 +0000

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6L80E / 6L90E Transmission Tuning

Helping a friend and trying to learn a few things and lose hair at the same time. I have a 2014 2wd Silverado with rebuilt 6l80. The 6l80 that was rebuilt was from a 2014 2wd Silverado also. He has been trying fo a while to get it to do a trans fast learn to no avail, This is where I come in. I have have tried countless times and am having no luck. The OS system of the Tehcm of the installed transmission matched the OS of the origional, He contacted Sonnax at one point and they told him to put the Tehcm from the origional in the rebuilt trans. It is in the trans now along with origional tune. No matter what temp I try to do a fast learn it shows "temp lo" until it times out then it shows aborted, While it is showing temp lo also have no gears. Can someone please point me in the right direction? Could the temp be reading in the scanner and and Tehcm still think the temp is low. thanks for your help in advance,

Please help w/ base tune. Zero Gravity PCS controller

NITEMER — Sat, 14 Feb 2026 21:56:13 +0000

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6L80E / 6L90E Transmission Tuning

Hello new here. I have zero experience with this trans or controller.

I have a 1987 C30 dually that I swapped in a LQ4 being controlled by a terminator Xmax and I installed a 6l90 being controlled by ZeroGravitys PCS TCM2650. They sent me a base cal in a CFG format. The instructions say it should be a CFG file but when I try to load it needs a BIN file. I emailed them but they really take too long to answer.

Has anyone used zero gravity controller? Anyone have a basetune I can use? I also have HPtuners but again I have no experirnce so I dont know if I can use a HPtuners base cal with the zero gravity controller. Any help will be grately appreciated.

Stock 6L80 Trans Tuning

Silverado15 — Mon, 05 Jan 2026 22:06:53 +0000

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6L80E / 6L90E Transmission Tuning

I am curious about what can be done with tuning to make a stock 6L80 in a 2015 pickup last longer. I have been told to disable converter lockup for normal driving in 1-4 gear, and to disable dod. I have also heard multiple answers as to what should be done with converter slip when locked. For stock converters, I've been told everything from leave it stock, drop slip speed to 5-10 rpm, and have also been told to drop it to 0 rpm, but most bave said 0 rpm on a stock converter may cause issues. I have also been told to drop slip to 0, only if you have a billet converter. What should be done to a stock unit, or even a unit with a billet converter for longevity? Mainly looking to have a transmission that will last, and work better than factory. Thank you!

1964 c10 swap

db213 — Wed, 17 Dec 2025 04:00:23 +0000

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6L80E / 6L90E Transmission Tuning

I have that has a 2014 5.3 truck engine with a 6L80e in it. This is what file we pulled out of the engine controler and the TCM. I doen't want to shift or communicate. I was told the trans file needed to be flashed stand alone. Just not sure.

What is Max RPM shift points for a 6L80?

db213 — Wed, 22 Oct 2025 14:25:00 +0000

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6L80E / 6L90E Transmission Tuning

I have a customer that whats to shift at 7500 RPM. Is that feasable? Has anyone done this with this Transmission?

Thanks

Darren

How to change operating system

Tdouglas5 — Tue, 30 Sep 2025 01:17:40 +0000

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6L80E / 6L90E Transmission Tuning

I'm swapping a 2015 Camaro drivetrain into a 86 Monte Carlo ss, I had the ecm and tcm tuned by the company that built the harness. My 6l80e wont shift out of first until 3k rpm then goes to third right away and as soon as it's in 3rd it goes back to first. I data logged it and sent to company.. they said it's not communicating and needs operating system to match ecm. They put there generic tune on my 2015 ecm from a 2011 Camaro vin number and said they don't change tcm os due to risk of bricking and I would have to get a local tuner to install a 2013 Camaro ss operating system
guess I got took on that.
I haven't done any tuning on my own, just used hp tuners to download tune on my l5p duramax but willing to give this a go if someone can tell me where to get operating system and maybe instructions and how to tune after that

2016 silverado clunking into gear when skipping gears upshifting and downshifting

TommyB — Fri, 29 Aug 2025 18:16:52 +0000

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6L80E / 6L90E Transmission Tuning

2016 silverado 6l80, circle D converter, stage 3 transmission rebuild kit

It will clunk into gear very intermittently and when watching what gear its in while I am logging its seems to be when it drops multiple gears accellerating or upshifts multiple gears when slowing down. it also seems to do it on the 1-2 shifts when slowly accellerating once in a while. Can't seem to figure out what tables in the tune file would cause this.

I've attached a tune file and log file.

TCM 5672 - TCC Desired Pressure - 10L80

luisdavid11 — Wed, 27 Aug 2025 05:05:36 +0000

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6L80E / 6L90E Transmission Tuning

Was wondering if you had any insight on to what the axis are on this table? PCA pressure and Line pressure, what are they referring to? Having a hell of a time getting an A10 camaro with an aftermarket converter to play nice with part throttle lockup and I can't find any info on this table or where to log any of these axis.

Thanks in advance