8 > 6
Your mechanic needs to have hung around a dealer or transmission shop over the last 5-10 years. He'd change his mind too.
6L80 has a higher issue rate for sure.
8L90 has its quirks but if you change the fluid regularly and use the right fluid, its been a more reliable unit over the 6L80.
I would say the main negative would be that I believe it's around when the 8-speed was introduced, so most likely it will have the original parts, whereas newer trucks will have 8 speeds with various upgraded/improved parts that fixed various issues with it.
The 8 speed isn't a bad transmission at all. They just have common issues like any transmission.
Ideally you'd like to find a low mileage truck or find a truck with good service history or maybe even a factory rebuilt transmission already in it.
I’m in the market for a K2XX 6.2 truck and I’ve heard some conflicting things about reliability. My mechanic says that the 8 speed is just not consistent at all in reliability and that some people can be ok and others can’t. Given this I was hunting for a 2014 only truck with the 6.2 (which is quite hard to find) and I’m coming on here to ask if the 8 speed is really that bad. I need to expand my years so I can find some nice trucks but I don’t know if it’s better to wait on a 2014 to pop up or to expand my field and get some more deals.
Thanks in advance for any feedback and comments
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