Well when I spin the speedo using a drill it didn’t wobble...are you saying remove the speedometer cable entirely and grease the cable section that runs close to the side of the transmission, or where it enters the speedo head?

I know the issues not at the transmission end because it wobbled on my old transmission, got a replacement and it still wobbled after, so it’s likely the cable (although I replaced that too a while back...but applied no grease)

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k