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6L80 transmission failure - my rebuild experience


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2016 Sierra 2wd with 6L80

 

purchased
87,059

 

Was just 3 months outside warranty for the Transmission when problems started.

Returning home from a 500 mile trip I noticed it was having issues the final 25 miles. *jerking and abnormal shift changes

Weighed my options and part availability before having it towed to:

Precision Transmissions
300 Ross St, Amarillo, TX 79102

https://goo.gl/maps/pTejCdW2E35Ns4417

 

was loaded onto the flat bed and hauled to Amarillo with
95,277

 

after transmission rebuild
95,299

 

after ATF filter and fluid replacement
98,641

 

I did the ATF and filter change at home in the driveway.

Recommend getting a large drain pan. *7.5 gallon drain pain I used

 

The ATF and filter change for a 2wd was mostly easy... but i cursed GM for building the exhaust they way they chose to route it under the transmission pan.

I know the 4wd would require more effort to change.

 

hope to have the truck for another 100,000 miles without major mechanical failure. *lifters and cam planned for next year*

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On 6/16/2022 at 9:00 AM, pixelmonkey said:

2016 Sierra 2wd with 6L80

 

purchased
87,059

 

Was just 3 months outside warranty for the Transmission when problems started.

Returning home from a 500 mile trip I noticed it was having issues the final 25 miles. *jerking and abnormal shift changes

Weighed my options and part availability before having it towed to:

Precision Transmissions
300 Ross St, Amarillo, TX 79102

https://goo.gl/maps/pTejCdW2E35Ns4417

 

was loaded onto the flat bed and hauled to Amarillo with
95,277

 

after transmission rebuild
95,299

 

after ATF filter and fluid replacement
98,641

 

I did the ATF and filter change at home in the driveway.

Recommend getting a large drain pan. *7.5 gallon drain pain I used

 

The ATF and filter change for a 2wd was mostly easy... but i cursed GM for building the exhaust they way they chose to route it under the transmission pan.

I know the 4wd would require more effort to change.

 

hope to have the truck for another 100,000 miles without major mechanical failure. *lifters and cam planned for next year*

Not sure if you're aware of this, but Precision Transmission has a youtube channel. I've watched a few of his rebuild videos. Definitely seems like he's mastered his craft. Bet it serves you well. 

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On 6/23/2022 at 9:24 AM, Giggity231 said:

Not sure if you're aware of this, but Precision Transmission has a youtube channel. I've watched a few of his rebuild videos. Definitely seems like he's mastered his craft. Bet it serves you well. 

you are correct, and one of the videos he posted was the transmission from my truck

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Your transmission will last a lot longer than that if you run it on the severe service schedule and either "flip the pill" or run the new lower temperature transmission thermostat, unless Trent did it while it was at his shop.

 

How does the transmission perform since the rebuild and what changes from stock did you get?

 

I am strongly considering having them overhaul mine.

Edited by swathdiver
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rebuild was to preform the same as stock. 

 

will take a few attempts to get them on the phone, as they are busy and either have the phone busy or letting it ring to get other customers taken care of with their vehicles. 

 

I was happy that he had the parts in stock, back in March. Not sure if they have new supplies available or if their stock pile has been depleted. check with them.

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