Rear End noise

[1962fj40]

I think I narrowed this down. Over the years like many of you, you learn by your mistakes. When I did the SM420 conversion I think I measured incorrectly. I'm pretty sure that both shaft splines should be fully engaged in the slip joint?

With these not being fully engaged, there is a good amount of slop in between the two halves of the drive shaft.

Comments?

 

[Rock40]

I think I narrowed this down. Over the years like many of you, you learn by your mistakes. When I did the SM420 conversion I think I measured incorrectly. I'm pretty sure that both shaft splines should be fully engaged in the slip joint?

With these not being fully engaged, there is a good amount of slop in between the two halves of the drive shaft.

Comments?

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View attachment 4085729

Yeah, I’d say the shaft isn’t engaged on the splines nearly enough. No way that on SUA leaf springs, you’d get probably more than 1/2”-3/4” of shaft compression on absolute full bump. I’d still want to try and compress the suspension to be sure but I think you’re on the right track. The splines shouldn’t be loose on the slip yoke unless they are significantly worn