TRANSMISSIONS SHIFT TO LOWER ENGINE SPEEDS

This article describes two automatic transmissions designed to improve fuel economy, and the transfer case used in a new four-wheel-drive sedan. Ford's new automatic overdrive transmission (AOT) includes an overdrive fourth gear, a no slip power flow when in fourth and a special torque converter blade configuration redesigned to reduce engine load at idle. Final drive in fourth gear is 61:1. The new GM lock-up torque converter consists of a pressure plate lined with a clutch facing material that is splined to the turbine (input) shaft of the transmission. When the converter clutch engages, the engine and transmission become mechanically coupled, eliminating the efficiency loss from slippage. The clutch is engaged only in third gear. AMC's four-wheel-drive Eagle uses the latest version of the Quadra-track which features limited slip through viscous rather than mechanical friction. The viscous coupling also absorbs drive line vibrations. The action of the viscous coupling is velocity-sensitive.

  • Availability:
  • Corporate Authors:

    Automotive Industries International

    Chilton Way
    Radnor, PA  USA  19089
  • Authors:
    • MCELROY, J
  • Publication Date: 1979-10

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00325024
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Apr 15 1981 12:00AM