Same unit as Ford RAT except for a GM bolt pattern to the bell housing. Fully synchronized with 36 tooth synchro rings. This transmission is found in performance applications.Ĭast iron, top-loaded case with side shift linkage. This is the only GM 3 speed with the same bearing front and rear. Found in heavy duty applications.Ĭast iron case and extension housing with 7-bolt side cover. Fully synchronized with 27 tooth 1st gear and 36 tooth 2nd & 3rd gear synchro rings. It has a four step cluster and all the gears are helical cut.Ĭast iron case and extension housing with 9-bolt side cover.
1966-69 units may have electric overdrive. Fully synchronized with 30 tooth synchro rings. Some of 1964-65 units have larger gears with the same tooth count as the 1940-68 units.Ĭast iron case and extension housing with 7-bolt side cover. Those from 1955-68 may have electric overdrive. Units from 1940-54 have enclosed driveline, otherwise known as a "torque tube". Has non-synchro 1st and a "barrel" type 2/3 assembly. Cast iron case and extension housing with 4-bolt side cover.
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