said transmission casing comprising an open front end for permitting therethrough an assembly of said main speed change mechanism into {HEAD ~ said front half} of {TAIL ~ said transmission casing}, a second intermediate wall located behind said main speed change mechanism , integral boss means disposed within and around said open front end, and a bearing support frame disposed within said open rear end of said front housing and secured directly to said boss means 
of
said transmission casing comprising an open front end for permitting therethrough an assembly of said main speed change mechanism into { HEAD ~ said front half } of { TAIL ~ said transmission casing } , a second intermediate wall located behind said main speed change mechanism , integral boss means disposed within and around said open front end , and a bearing support frame disposed within said open rear end of said front housing and secured directly to said boss means
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