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Judge I don't know how to give you more info then I did. I will redact my previous post to edit this in though, the 6l90 has TWO more planetary gears then the 6l80 (6 vs 4), I was thinking of the 4l90 vs 80 (which is 5 vs 4)
From GM
The Hydra-Matic 6L90 is six-speed automatic transmission for rear- and four-wheel-drive trucks, designed with modular flexibility and compatibility with advanced electronic controls. It is a heavy-duty version of the 6L80 six-speed automatic, with a strengthened input gearset which has two additional pinion (planetary) gears for six total, and a strengthened output gearset, that uses wider gears than the 6L80. The 6L90 shares about 75 percent of the parts as the 6L80, although the case of the 6L90 is 35mm longer than the 6L80 case. (assuming for the extra meat on the output gearset)
Unfortunately for us car guys, it's not the gearsets that are failing most often, but rather the torque and rpm we turn is killing the clutches. The 6Ls are clutch operated, and not band operated like the 4Ls, which is part of what is giving builders issues at the moment as while the clutch mechanism for gearshifting is more precise, it isn't nearly as strong.
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