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Re: correct transmission for 6.0
Actually didn't the 6.0 motors come with a 4L60E-HD up until they came with a 4L65E and even later some with the 4L70E. I guess my point is didn't they come with the heavier duty version of the 4L60E due to the motors higher torque ratings. Not a trans guy but IIRC one difference is 5 vs 4 planetaries or bearings around the sun gear....or some spacial sounding bits. 
That said................I'm running a 4L85E behind my 6.0L.
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Kurt -
'68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy
'72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close
'06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD
'18 Kia Sorento - wife's econo-driver
'95 Chevy S10 - reg cab shortbed, LS, 4.3, auto...
my '68's powertrain and chassis build -links broken
A surprise phase - carb to efi -links broken
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