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Knocking from around the driveshaft/advice on how to proceed

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    Knocking from around the driveshaft/advice on how to proceed

    I have 1991 325i.

    Recently noticed a knocking/bumping sound coming from the low rear part of the car. Narrowed it down to it happening only while taking off from a stop -- the more stress on the driveline, the more likely the sound is to occur.

    Research led to looking at the driveshaft.

    --Diff was recently swapped to an LSD and all connections to it are solid.

    --Halfshafts/CVs seem fine. There is axial play in the shaft but that seems to be correct.

    --diff/driveshaft connection seems fine, no play when attempting to rotate the driveshaft here.

    --Driveshaft at the driveshaft/transmission connection has significant rotational play. Guibo seems to actually be in good shape.

    Didn't drop the muffler/cat to look at the support bearing area, but it must be something in this area correct? I'm almost certain but wanted to check in with others.
    ____________

    Next question -- assuming the driveshaft needs work, what are my more budget (but still acceptable) options? I want to eventually do an S52 swap, and unless there's a solution that works for both I don't want to drop a bunch of cash.

    I've seen some adapter guibos but these seem to be more race-spec/very stiff -- and this is my daily.

    Thanks for any help!
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