Thread: 98 Legacy 2.5GT
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Old 12-24-2010, 08:33 AM   #18
Scooby Guru
Member#: 4021
Join Date: Feb 2001
Chapter/Region: NESIC
Location: Natick, MA USA
1999 Legacy GT Ltd
Quick Silver Metallic


Originally Posted by Frogsthatmoo View Post
Yes, that will affect the car's transmission/diffs.

Over a period of time it can slowly damage and wear out parts depending on the size differences. Most people highly recommend changing out all 4 tires together and I also believe Subaru references that in the manual somewhere.
My recollection is that Subaru says that there should be no more than 1/4 of an inch difference in circumference of the front & rear tyres. Personally I *think* this may be an overstatement, and that Subaru's AWD system can handle a fair amount of difference (although its maybe a bad idea to test these "limits"). At any rate it is a good idea to rotate tyres front to rear on a regular basis so as to prevent variations in tyre sizes.

In addition to exchanging Automatic Transmission Fluid and adding "Lubegard", I would have the Transmission filter exchanged with a new one.
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