Gearstar Highlights – Building The Perfect 4L70E Chevy and GMC RWD sport utilities from 2006 and up (Trailblazer SS).Half-ton RWD Chevy and GMC trucks from 2006 and up.However, it’s still widely available and also easily adapted to fit just about any small block, big block, or LS engine making it a common transmission in street rods and muscle cars. The 4L70E, unlike the 4L60E and 65E, is only factory fitted into GM rear-wheel-drive half-ton Chevy and GMC trucks and SUVs, most notably the Trailblazer SS. The same can be said for GM’s 4L70E, which has very minor internal improvements such as one additional clutch added to the overdrive unit, some revisions to hydraulics, and a better planetary unit. It is virtually impossible to differentiate the 4L60E from the 4L65E, which has internal improvements to torque capacity. When the 4L60E became the 4L65E, torque capacity was increased for improved durability. L = Longitudinal Application (North/South)ħ0 = Torque Capacity based on vehicle gross weight where “70” means 7,000 pounds.ĤL70E – indicate a higher capacity, than the 4L60E transmission.
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