1965 Mustang 3speed to 4speed | Vintage Mustang Forums Nov 27, 2010The 67 all synchro 3 spd can be used or then a toploader 4 speed. Watched that 3 to 4 spd conversion being done on a 67 in a couple hours. MMonthly, way back in the 80's did that 67 3 spd. trans in a 66. They referred to the early 3 spd as a "paper trans" The Dagenham, (yawn) was an English Ford donation. I have a 1965 mustang Straight 6 What's the Deal with the 3-speed Manual Transmission Dec 14, 2015Young muscle car buyers on very tight budgets generally opted for the 3-speed manual transmission even though they preferred a 4-speed. To illustrate this point if a young buyer pinching those pennies back in 1965 wanted to buy a new Mustang with a 289 CID V8 the 3-speed manual was standard. The optional 4-speed was a $184.
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