I got mine from FCP Groton for about $14(?) each. They are after-market (possibly scan-tech) but are doing just fine. It is generally considered wise practice to replace both when one goes since they will be "balanced". The theory being, if one has gone, the other won't be far behind and is probably already weak. Just replacing the bad one can put undue stress on the new one thereby allowing it to fail prematurely. I've seen no hard evidence to back up this line of reasoning but it sounds good so I follow it anyway. I've never had 2 new ones fail so soon as you describe, sounds like they (or one) is defective.
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Bob Kraushaar '94 945T, '91 940T(back from retirement), '88 240, '84 242T, '94 F-150, '89 560 SL, '68 Shelby GT-500 KR
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