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Q: When engine cold 1st thing in a.m. there is strong vibration in rear of vehicle. on 2003 Toyota Highlander

Edit
Only occasionally first thing in the morning without warmup there is a strong vibration apparently from rear of auto within the 1st 1/4 to 1/2 mile. It stops after that. It is, however becoming more and more frequent.
All fluides have recently been changed including tranny.
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Did you have a rear differential fluid service? It's possible if so that it you could be missing a friction modifier from your rear fluid. Check with your point of service and ask them.
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