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1966 Mustang 6 cylinder drive shaft/u-joint questions

3.3K views 5 replies 3 participants last post by  jtfx6552  
#1 ·
Hi all,

I’m working on a 1966 6 cylinder (small bolt pattern) coupe with a 3 speed manual transmission. I’ve fitted a top loader 3 speed using an Econoline bellhousing (This is a story all by itself!). The original driveshaft has the small 1100 series u-joints. These are 1” caps with around 1.78” spacing between the c clips.

From what I’ve read, there is no conversion joint to make the drive shaft mate to the 1310 joint that the slip yolk takes in the top loader.

What’s the best way to proceed? I’d hate to have a custom drive shaft made to make this work because I think that the 7.5 rear may be the next thing to go. I’d like to find a drive shaft that takes the 1310 u-joints and get a conversion joint for the rear axle. Is there a pinion flange that I can use that will allow for this on the 7.5?

It looks like there is a conversion joint for a 1310 joint to the 1” cap joint with a 2.3” space between c clips. Is there a pinion flange that exists with the 2.3” space? What year Mustang would have a drive shaft with 1310 joints that would fit?

This conversion has taken me months just trying to figure out what would work.

Thanks for your help!
Brian


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#2 ·
I’m working on a 1966 6 cylinder (small bolt pattern) coupe with a 3 speed manual transmission. I’ve fitted a top loader 3 speed using an Econoline bellhousing (This is a story all by itself!). The original driveshaft has the small 1100 series u-joints. These are 1” caps with around 1.78” spacing between the c clips.

From what I’ve read, there is no conversion joint to make the drive shaft mate to the 1310 joint that the slip yolk takes in the top loader.

What’s the best way to proceed?
The best way to proceed is to use a C5ZZ-B slip yoke. Early C4-equipped 170 and 200 Mustangs had the small driveshaft, and Ford used this yoke to attach the big C4 spline.
 
#4 ·
Incredibly rare to find a used one that's not trashed. That's why we asked the manufacturer to make that repro. We couldn't find even a decent used one, let alone new, so we sent them a sample and basically begged. Good move as it turns out, because it's really helpful when converting to a T5 5-speed. Just bite the bullet and buy a new one.