The frame is secured to internal boss on a transmission casing , which is fastened to the rear of the front housing and has an open front end, and is used for supporting respective one ends of {HEAD ~ transmission shafts} for {TAIL ~ both} of an additional speed change mechanism , which is disposed within a rear half of the front housing, and a main speed change mechanism which is disposed within a front half of the transmission casing 
The frame is secured to internal boss on a transmission casing , which is fastened to the rear of the front housing and has an open front end , and is used for supporting respective one ends of { HEAD ~ transmission shafts } for { TAIL ~ both } of an additional speed change mechanism , which is disposed within a rear half of the front housing , and a main speed change mechanism which is disposed within a front half of the transmission casing
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