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rear diff swap question

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02-10-2013, 03:58 PM	#1 (permalink)
Uselessmark WRXtuners Member Car: 03 WRX From: Weare, New Hampshire Registered: Sep 2012 Posts: 10 Trader Rating: (0) Reputation:	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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02-10-2013, 04:52 PM	#2 (permalink)
pzr2874 WRXtuners Member Car: 2007 MazdaSpeed3 From: San Antonio, Texas Club Region: Gulf Coast Registered: Jun 2007 Posts: 4,529 Trader Rating: (0) Reputation:	If the part#'s are the same,probably. ____________________________ Paul 2007 XT 2007 MS3
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02-17-2013, 03:35 PM	#3 (permalink)
detrails01 WRXtuners Member Car: 05 WRX From: ridge, New York Registered: Jan 2013 Posts: 32 Trader Rating: (0) Reputation:	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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02-17-2013, 06:25 PM

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brfatal

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The ratios need to be the same.

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