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Reply to "550 spyder transmission and engine issue"

Bay window buses did not get a type 4 engine until 1972.  1968-1970 used single port 1600 engines, then changed to dual port 1600 for 1971.  Buses did get the new bus IRS transmission in 1968, which are much stronger than a type 1 transmission.

 

The type 4 did arrive in 1968 in the model 411 though.

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