Web Reference: GM 8L90-E automatic transmission specs, ratios, and information. The 8L90 is an 8 speed automatic transmission found in various GMC/Chevrolet applications, including the 2015+ Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Express, GMC Savana, Chevrolet Colorado, and GMC Canyon. By means of a Chevalley basis for the Lie algebra, one can define E 8 as a linear algebraic group over the integers and, consequently, over any commutative ring and in particular over any field: this defines the so-called split (sometimes also known as "untwisted") form of E 8. ATI is now developing components to upgrade your 6 and 8 speed transmission! The 6L80E has a gear ratio spread of 4.03, 2.36, 1.53, 1.15, .85 and .67. At 500HP, the clutches in these units go out and at 700HP you WILL start hurting hard parts. ATI can build up your 6L80E transmission for up to 1000HP.
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