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1st Gear ("L1") Overrun Braking

With selector lever in "L2" range, and vehicle speed approximately 30 MPH at constant throttle, move selector lever to "L1" range. An increase in engine RPM and an engine braking effect should be noted.

CLUTCH & BAND APPLICATIONS

Lever Position Elements In Use
Drive
First Sprag Clutch & Low Band
Second Second Clutch & Low Band
Third Second Clutch, Third Clutch & Sprag Clutch
L2 - Intermediate Second Second Clutch & Low Band
L1 - Low Second Clutch, Third Clutch & Sprag Clutch
Reverse Reverse Clutch, Sprag Clutch & Low Band
Neutral or Park All Clutches & Bands Released Or Ineffective
Fig 1: Turbo Hydra-Matic 180C Hydraulic Circuits Diagram
G96I15568Courtesy of GENERAL MOTORS CORP.