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I want to switch from my 3 to a 4 speed and I am looking for info on what it takes to do it.
Can anyone help me with info?
Thanx
Gordy
 
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All you will need is a 4-speed transmission and a shifter this might be a good time to replace the clutch and throw out bearing.
Check out the parts for sale section.
 

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If you are going to do that, and if original does not matter, you'll gain more by going with a 5 speed. You'll need some more parts , but you'll get OD . The 3spd and the 4spd have the same 1:1 final ratio. JMO
 

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A SB Top loader, 4 speed shifter, and speedo cable. As others have mentioned, replace all the good stuff while your there.

Jeff
 

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If you get a 4 speed for a good price and trust the seller, it can be a good upgrade.....any 60's/early 70's 4 speed will keep your motor in a narrower rpm range (easier to keep up power!!)

Beware of 80's 4 speed tranny's as many were just 3 speeds with an overdrive, and are weak!!
 

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As posted if you are going to pay for the 4 speed. You might want to consider the T-5. Depending on the money. If you do go to a T-5 your rear end will be a little low. You'll have to be doing 70 before you can really use 5th gear. The 3 speed cars had 2.80 rear gears. A 3.00 of 3.25 would be better. Going to 3.5 or 3.55 rears make 5th very usable but you really loose 1st gear. You'll role about 5 ft and have to shift to 2nd. Alot of 2.8 setups just don't use 1st gear.
 

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4spds of the period also use a different and now expensive reverse light switch.
 
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