This modification involves putting a spring in the cup of the slip shaft. (This method is also used for a locked front end, and can be used with a stock Dana 44 stub shaft as well). The spring will provide pressure, pushing the (2) passenger inner axles apart and keeping the stub shaft secure in the housing. People have used a 7/8-inch compression spring cut down to about 2-1/2 inches. You may have to play around with the length of the spring before you are comfortable. Make sure you install the complete passenger side axle shaft and spindle. This will give you an idea as to how much play the spring allows, and ensure everything will bolt together.
Some people have also used a Chevy valve spring. Whatever spring you choose, cut it to a length (if you need to) so that when you put the spindle back on the knuckle, and before you start bolting it down, you are just able to start feeling some resistance…spindle will push against outer shaft, which in turn will try and push that spring in.
Some believe that a valve spring is to loaded, when you really just need a bit of push to keep the shaft where it belongs. Remember, the differential will not exert a force to push the axleshaft out. It can move out on it’s own, but not if there is a small amount of resistance.
You should weld the cap on the slip yoke in place so it will not pop off from the spring pressure.
Choose a spring…
Cut it to the desired length….
And insert it in to the slip yoke….
You may need to cut a little of the spring off at a time and check it until you find the ideal length and tension.
That’s it!