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It's been over 10 years since I've seen an actual printed statement from SOA on the AWD 1/4" tire rule, and many have questioned whether this was now historical folklore or still an actual mechanical concern. There was a paragraph in the December 2010 Subaru Tech Tips about "Binding on Turns", but that's the last evidence I've been able to find to support our internal discussions.

Well, finally something! In March 2019 there was a Technical Service Bulletin issued (16-120-19). It was in response to a particular AWD Transfer Clutch Chatter Sound / Shutter experienced on TR690 CVT's, but the diagnostic procedure does begin with the hallowed instructions to eliminate mismatched tire induced torque binding before going deeper!

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