6.0 are backed with a 4L80 or 4L60? I want the truck downshift in tow/haul like my 6.2 did. Saves the brakes and makes going down hills that much easier. I know the Allison trans does down shift on decel.
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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