Tim, now it's the transmission. Just because there is not a big allison they will complain about that. The L65 was originally developed for the 6.0L engine that's in the Denali and others. It is rated to handle 400+ HP and ft/lbs of torque. It uses a case thats the same in size as the L60 that this guy is really thinking of but the guts are "beefed up" considerably. It's a stronger transmission than the old TH400 that was used forever in 3/4 ton GM trucks. Here are some of the upgrades for the L65: five-pinion gears for input and reaction gearsets (versus four-pinion gears in the L60), heat-treated stator shaft splines, induction hardened turbine shaft, heavier-duty low/reverse roller clutch, additional friction plate added to 3-4 clutch (seven plates versus six in L60), and shot-peened output shaft.
Please ask him to point to all of the vehicles with the L65 as the standard transmission.
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