Calling any 6l80e experts

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Clg88

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New to the forum
I have a question about 6l80e repair & improvement.
I have a new to me 09 Yukon XL. The 6l80e is in pieces on my bench for a rebuild, and I will install a valve body kit at the same time.
I'm wondering if anyone has experience building or modifying these transmissions who could weigh in.
I am looking at both the Sonnax Zip Kit and the Transgo Shift Kit.
Is one preferred over the other & why?
Thanks
 

Foggy

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I was going to do just the zip kit and a new aftermarket torque converter... but
then I decided to add a supercharger, so I went with the cirlce D stage 4 kit with all the
upgraded hard parts...
I think for regular use, the zip kit and a new TC is the way to go.. Remember, the OE
torque conv has a real crappy lock up clutch in it.. Go aftermarket HD that will have
a decent clutch in it or you'll be back into it real soon
 

Geotrash

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Transgo usually has a few bits to fix specific weak points that sonnax doesn’t include in their kits, but not sure about their stuff for the 6L80. When I rebuilt a ZF 5HP24 on my bench a few years ago, I bought a complete master banner kit from I forget who, plus a few bits from Sonnax and a few bits from Transgo to get the perfect setup.
 

swathdiver

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New to the forum
I have a question about 6l80e repair & improvement.
I have a new to me 09 Yukon XL. The 6l80e is in pieces on my bench for a rebuild, and I will install a valve body kit at the same time.
I'm wondering if anyone has experience building or modifying these transmissions who could weigh in.
I am looking at both the Sonnax Zip Kit and the Transgo Shift Kit.
Is one preferred over the other & why?
Thanks



Dorman TECHMs, at least a few years ago, had a very high faulty rate. Stick with GM OE if replacing the whole thing. Alternatively, you can rebuild it on your kitchen table with this kit:

 

Joseph Garcia

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Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving recommendations and perspectives from the knowledgeable folks on this Forum.
 

Just Fishing

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Read through the documentation on the 6l80e on the sonnax website.
Lots of information about fixes, known issues, etc.

I did a mix of Sonnax and Transgo on my valve body when i first got the hoe.
Get the ac delco screen kit, sonnax valve body check balls (they don't shrink like the oem).
And i added the sonnax endplug kit for good measure.

I also rebuilt my techm, i found the pressure switches were on their way out.
Sonnax has a tool that was very helpful.
The transgo shiftkit also had spare laminates and seals, it was a little bit of trial and error and found the spare set to be very handy... lol
 

Charlie207

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Just Fishing

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One of my favorite new subscriptions. The guy knows his stuff.

My only wish is to see him dig into a Nissan RE5R05A (Armada/Titan) and see how it compares to a 4L60 or 6L80. My Armada is a stock 2005, and it shifted better than my 2014 Yukon 6L80, even after the Blackbear tune.

I wish he went into detail about what he does for "Fixes" and assembly.
Seemed like people had to pry information out of him for a simple thing like a pwm block off in the 4l60. :jester:

but the disassembly videos are very interesting.
It's also nice to see what types of tools he uses, especially when it's a custom tool.
 

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