There will be two brackets on the top rear of the case for the rear O2 sensor wiring. In the pan, there are two solenoids on the front face (relative to the transmission in the car) of the valvebody. '96: VSS on passenger side of tailshaft housing, and when you remove the torque converter, there is "PWM" in raised letters on the front surface of the pump, and around the outside of the pump there are raised ridges. '95: VSS on driver's side of tailshaft housing, and when you remove the torque converter, there is "PWM" in raised letters on the front surface of the pump. Inside of the wiring connector is purple. In the pan, only one solenoid on the front face (relative to the transmission in the car) of the valvebody. '94: VSS on driver's side of tailshaft housing, and when you remove the torque converter, there is no "PWM" on the front surface of the pump. How to visually tell B and D-body transmissions apart by year: This solved the low/reverse clutch release problem and makes the TransGo manual valve mod unnecessary (see ATRA bulleting 2002-46). There was a new manual valve added along with a relief port over the manual valve on the valve body casting with this change. Also changed the 3-2 downshift solenoid in mid-1995 from TBD to TBD. ’96: PWM TCC plus a different tailhousing design with new-style Vehicle Speed Sensor (VSS). 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, but best to have a shop install the Sonnax 77754-03K valve). 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: If they had the LT1 engine, they're all the same. All '94-96 wagons came with LT1s standard. There is a Sonnax 77284-K aftermarket gearset available which reduces 1st and 2nd to 2:84:1 and 1.55:1 it is ~$700. No questions please.Ī what-body? - refers to the GM vehicle "platform": (relevant years are included)ī-body: Chevy Caprice, Buick Roadmaster, Olds Custom Cruiser (1991-1996)Īll 4L60E/4L60/700R4 have the same gear ratios from the factory. Comments, corrections and suggestions are welcomed.
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