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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 03-29-2010   #1 (permalink)
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Question 1967 Mustang 3-speed to 4-speed transmission Swap?

OK. I've owned my 1967 mustang (289 2v) for 20 years now and it is time to get rid of the worn out 3 speed and put in a toploader 4 speed. I found one with the tag numbers HEH B. After research I found out the it came out of a 1964 fairlane with a 289. Will this just drop right in my car, take some modifications or will it not work at all? I love the toploaders and don't have the money for a 5 speed so that is out of the question. My rear end ratio is 2.79:1. Do I need a wide or close ratio trans?
It seems like the more research I do the more confused I get.
HELP!!!!
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Unread 03-29-2010   #2 (permalink)
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It will fit, but the bolt pattern where it bolts to the bellhousing might be different. The earlier top loaders had a narrower pattern and a different rear trans mount(most aftermarket replacements have both bolt patterns) I had a bell housing redrilled with the proper bolt pattern and it all bolted up.
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Unread 03-30-2010   #3 (permalink)
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Thanks Putt. This trans i'm buying comes with a bellhousing and shifter. So I hope it will work. Will the first gear be lower than my 3 speed? It seems like my trans has a real high ratio in first gear.
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Unread 03-30-2010   #4 (permalink)
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Your 3 speed has a 2.99 first, close 4 has a 2.32 first while wide 4 has a 2.78 first.
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Unread 03-30-2010   #5 (permalink)
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Thanks Buzz for the info. Wow, so I will be going higher in first gear than what I have now.
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