Fixed yoke vs slip yoke

[Ziegelsteinfaust]

I have a 53 Willys in storage at my aunts that I will bring home to work on next weekend for my vacation. Since all my plans got canceled on me.

It sits on a heavily modified 1988 F150 4x4 rclb frame. Due to said modifications or corrections as I call them. I am worried my slip yoke set-up may not be ideal.

The the driveshaft is right about 34 inches at this point like it would be ready to drive. Is this too short, and I should score up a Bronco transfer case.

I will just be using the Willys for dirt roads to go fishing or exploring. Not going over the Rubicon here. It will sit on roughly 285/75r16's, and the suspension will be at factory height. The front has plenty of tire room, and the rear will once I cut open the wheel wells. Which are rusted out so why not at this point. I

[b454rat]

Take a measurement from the end of the t-case output shaft to the pinion nut. Take that measurement to a driveline shop. Tell them it's a slip yoke and he will make one or if your current driveshaft is enough to use that one to shorten.

[Ziegelsteinfaust]

Yes but is 34 inches to short for a 4x4 slip yoke drive shaft, and or should I look for a fixed yoke version?

[kwmech]

Fixed yoke would certainly be preferred for strength and longevity.

[57taskforce]

Originally Posted by kwmech

Fixed yoke would certainly be preferred for strength and longevity.

Absolutely.

[b454rat]

Not necessarily the strongest as some 1 tons came with them. But it’s definitely nicer to have off-roading. But slip yoke is not the end of the world. I wheeled one for a bit that had some flex in never came out. Getting air is when really need to be careful, or when the entire rear suspension comes unloaded. Normal flexing isn’t an issue cause the driveshaft is in the middle, so doesn’t move much. But for OP is doing it will be fine. But to do it right need to measure like I said, only right way to do it.

[special-K]

Other than when there are issues requiring the vehicle be run w/o rear driveshaft, the only problem with slip yoke extension is the housing strength. Proper driveshaft length is it's own matter with either set-up. Bad things can happen with over extension. The only problem I can think of with the 34" length is if the angle is too steep. Going to fixed yoke shortens the assembly creating a longer shaft length and lessening the angle. Front driveshafts are that short and work just fine... up until lifting calls for more length