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The VT25-E transmission introduced by General Motors for the 2002 model year is the first variant of GM VTi variable transmission family. The VTi is an electronically controlled Continuously Variable Transaxle (CVT). It is the first North American, high volume production CVT. This CVT enables fuel economy improvements over traditional step gear transmissions, with an improved packaging, wider ratio spread, neutral idle and complete absence of shifts for driver comfort. The VT25-E utilizes a controlled slip converter clutch in conjunction with electronically scheduled ratios and an integrated electronic throttle control to operate the powertrain at its most efficient level. A dual-lobed fixed displacement vane pump and jet nozzle filter arrangement provide the source pressure to a multi-tiered hydraulic control system. The multi-tiered hydraulic control system helps to achieve the precise control necessary to meet the durability requirements of this demanding market.

The 4T65-E transmission produced by General Motors is the third evolution of GM's original 4-speed F.W.D. automatic. This most recent redesign introduced for the 1997 model year meets new corporate goals for fuel economy and reduced noise, along with the ability to adjust shift character to meet the brand image of the various nameplates. Improving fuel economy and cooling at increased engine power levels was enabled by designing a larger diameter torque converter with the aid of 3-D modeling. The new converter has reduced internal leakage and incorporates a controlled slip clutch. Improvements in NVH have been achieved through a revised oil pump design and the use of the new phased drive chain, made affordable by the joint development of powdered metal technology required for the unique sprocket design.