Hello everyone, laying in bed awake pondering things I need to address on my cars (do you all do this top or is it just me), and this one is bugging me.

I have consistently had a vibration in my grey 300d, it is most noticeable around 35-45mph, under load. Let off the throttle and its gone, push the clutch in and its gone. Did the same before i swapped the trans, it seems more noticible with the 4 speed, but I'm thinking thats because of a more solid power transfer to the diff.

If I jack up one wheel and put it in gear and let it idle, there is a rhythmic clunking noise from the wheel that isnt lifted, and the axle shaft of the wheel on the ground seems to wobble where it enters the differential.

Am I looking at a new diff soon or am I barking up the wrong tree?

Thingsn Ive replaced hunting for the vibration:
Trans mount
Front flex disc
Center carrier and bearing
Rear flex disc
Rear axle shafts
Diff output seals (they were leaking, and may still be after replacement)

Should I start looking for a diff?
I'll try to get some video of what im trying to explain, I pro ably shouldn't try to post logical things late at night

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1982 300D (w123, "Grey Car")
1982 300D (w123, "Blue Car")
2001 Ford F150 "Clifford" (The Big Red Truck)
1997 Dodge Ram 2500 12V Cummins
1996 Dodge Ram 2500 12V Cummins
Previous Vehicles:
1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion