rear diff swap question - Subaru WRX Forum
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post #1 of 4 Old 02-10-2013, 03:58 PM Thread Starter
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rear diff swap question

pretty sure my rear diff is junk in my 03 wrx. but ive found plenty of junkyard replacements. my question is can i use a diff outta an auto wrx. theres one closer therefore cheaper for me to get but will all gear match up

03 WRX
07 WRX
05 2.5 RS
90 Celica alltrac turbo
90 Enfini RX-7 JDM FC3S swap
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post #2 of 4 Old 02-10-2013, 04:52 PM
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If the part#'s are the same,probably.

2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
2007 MS3
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post #3 of 4 Old 02-17-2013, 03:35 PM
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wrx auto final drive ratio is 4.11 and manual is 3.90. Being that the auto trans has slightly different gearing since its a 4spd and the final drive ratios are different I would think theyd have the same differential ratios. Does that make sense?

Let me know if you find out as im curious too.
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post #4 of 4 Old 02-17-2013, 06:25 PM
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The ratios need to be the same.
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