So I bought these 2 trucks brand new in 14, both are 2014 GMC 2500HD's 6.0 6l90's. Changed tranny fluid right at 100k the next service for both trucks was at 200k as all my other older GM trucks that have always had 100k complete cooler line drain no trans pan filter change.
These two trucks had the same symptoms, delayed reverse and 3-4 gear slam, both have burnt oil and lots of metal flakes in the pan, both hauled a max of 2500lbs most of the time. As all my GM trucks they receive a diet of STP Dexron IV, one died at 190k the other at 218k. I know there are some variables but both going out close to the same mileage makes me wonder what is really going on here, the older 4l80 trucks have 350k+ miles on stock trannys including the stock trans filter and loaded close if not more than these newer trucks and have held up great.
So my question was it the oil at fault?
Driver?
Maintenance?
Or is the 6l90 just a bad tranny?
I read in the GM forums where guys are swapping out the 6l90/80 transmissions in favor of the 4l80 because it has stronger parts? I don't know much about transmissions so please enlighten me trans guru's.
These two trucks had the same symptoms, delayed reverse and 3-4 gear slam, both have burnt oil and lots of metal flakes in the pan, both hauled a max of 2500lbs most of the time. As all my GM trucks they receive a diet of STP Dexron IV, one died at 190k the other at 218k. I know there are some variables but both going out close to the same mileage makes me wonder what is really going on here, the older 4l80 trucks have 350k+ miles on stock trannys including the stock trans filter and loaded close if not more than these newer trucks and have held up great.
So my question was it the oil at fault?
Driver?
Maintenance?
Or is the 6l90 just a bad tranny?
I read in the GM forums where guys are swapping out the 6l90/80 transmissions in favor of the 4l80 because it has stronger parts? I don't know much about transmissions so please enlighten me trans guru's.