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In need of expert advice Transmission and Rear Diff 2006 WRX

1K views 0 replies 1 participant last post by  mdangler 
#1 ·
I have a 2006 WRX 165k Transmission has been swapped 2 years ago for a 2005 Sabb 92x which I believe has a -3.900FD ratio. Issue I'm having is a loud noise from my rear under acceleration. I did a Redline fluid change on the rear diff and it got louder. I am the 3rd owner have had the car for 6 years, I believe the rear diff is the original 06 WRX which has a - 3.700FD ratio. Question is how big of a deal is it that these final drives dont match? I am taking it to Subaru this week to see whats going on but I have a feeling that its going to get pricey. I talked to a guy at Subaru and he told me it does not matter if they do not match is this true?
 
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