The PCM controls line pressure (holding power and shift feel), 1-2, 2-3 and 3-4 shift points (rpm), and TCC lockup timing. ’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: Please do not post questions to this thread.Ī 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 unless you swap in the Sonnax 77284-K planetary (this is aftermarket and $$$$): Comments, corrections and suggestions are welcomed.
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