Hey guys, I put my car up on a lift with wheels at full droop and again with wheels at rest under compression so the prop was at each location in the cups and felt no movement in the cups or axel either way, but I did feel some movement on each yoke/input sleeve of the diff, but not really any more then what I thought was normal or felt before, though it is marginally sloppier then any other portion of the drive train.

Is it possible that the roller bearings themselves inside the cups can be snug but worn out or seized causing the heavy vibration under acceleration, but still feel tight when moving the cups/axel? Wheels felt smooth when rolling in the air so I dont think anything internally is wrong with the diff, at least not detectable in this fashion, but possibly the side carrier/ yoke/bearing in diff? Not sure what the official name of this portion of the diff that connects to the cups, carrier?

I swapped my cups once already last year. I thought it might be worth adding some axel spacers to see if this has any effect as far as trouble shooting my problem. I figure it will cost me at least that much to take it to Honda to have them diagnose the problem, at least I will have some spacers out of the deal if its not a fix. I guess the next step if the spacers dont fix the problem is to get greasy and remove the boots so I can see the condition of the cups and roller bearings on the shafts. Any input or ideas on what the problem could be are appreciated

 

Turned out to be cup wear after all. I threw some spacers on to trouble shoot and they worked.