rolling diameter/finger pointing !

[grnSVX96]

as some of you may be aware on my red SVX I run 18x8s front 235/40 and 18x9s rear with 265/35 tyres same brand, in recent weeks the planetary gear section of the AT has had a major phart and to use Subarus description .."destroyed"..

I have been scanning several threads on rolling diameters as the AT specialist I have who is planning AT recovery is stating that they will not warrant their repairs as I'm running different sized tyres, and that this was the most likely cause of the AT failure.

Before my wheel/tyre purchase I looked extensively thru the threads here and concluded that as long as rolling diameters were as close to equal that all should be good... The only thing I didn't pick up on was tyre pressures, in that i didn't use a similar diff to that of std 33 fr and 29 rear, my tyres were 40psi at both ends, mind you I also only drove the car for perhaps 2500kms with new rim/tyres before AT failure..

Also in one of the many posts/responses Trevor in NZ spoke of JDM ATs being different to the US models ATs, JDMs are VTD - viscous couple [these were also in our AUD models as well] which I understood from his points made that these boxes could better handle differences in rolling diameters ...

Anyway I'd hate to think that incorrect trye pressures have brought me unstuck..and if so within 2500kms of driving..

Thoughts pls, I haven't yet but I will when its back on the road do the rolling diameter 'white out' thing and then fiddle with air pressures.

Any feedback would be appreciated
David