Overdrives and Underdrives
Borg-Warner/Quadra-Trac overdrive was available from early 1960 to 1969. The Borg-Warner overdrive case is 11¾ inches long (less torque tube adapter, if required), including the 11⁄2-inch-thick (38 mm) adapter. A complete T96 with overdrive is 18¾ inches long from front of case to end of tailshaft housing. The overdrive unit is the same for all.
The Dana 18 has a Power take-off (PTO) attachment on the case that can be used to drive equipment that accepts PTO input. A unique feature of the Dana 18 is the overdrive that attaches in the PTO port in the back of the system. An adapter allows use of both the overdrive and the PTO attachment, but it is no longer produced.
Laycock-DeNormanville overdrive was available from 1974 through 1976 for inline six with the 150T and V8 torque tube cars with the T89.
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