74 Duster, resto mod 6.4 front end rebuild questions

Ozyduster said
Yea the coupler tags the pipe but its like it needs to slide down the shaft closer to the box. Only other thought i had after research is if it has somehow colapsed? However thinking maybe use the flaming river coupler as gets rid of the fat coupler creating more space for the pipes etc
Anyone used one of these?
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Never used one, but I am leary of anything that doesn't allow for chassis flex. The stock coupler has some in and out allowance that a straight up u-joint doesn't give.

There are sliding sections of shaft available and is the direction I plan to go if I go down the road of deleting the stock coupler.