Also changed 3-2 downshift solenoid mid-year (see '96, below). ’95: Added a Pulse-Width Modulation Torque Converter Clutch (TCC) apply solenoid to control the feel of the TC clutch lockup (blamed for many 4L60E problems TransGo HD2-C bypasses this, or you can stake the TCC apply valve in place).
Everything else is done mechanically/hydraulically. The PCM controls line pressure (holding power and shift feel), 1-2, 2-3 and 3-4 shift points (rpm), and TCC lockup (timing and in the ’95-up models, apply feel). ’94: First year of electronic controls in the valvebody (versus the ’93 4L60, which did not have this). GM B and D-body 4L60E differences by year:
A what-body? - refers to the GM vehicle "platform": (relevant years are included)ī-body: Chevy Caprice, Buick Roadmaster, Olds Custom CruiserĪll 4L60E/4L60/700R4 have the same gear ratios which cannot be modified:
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