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S-197 Mustangs
Changed diff fluid, backlash at .017", what to do?
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<blockquote data-quote="Mojo88" data-source="post: 15694200" data-attributes="member: 184279"><p>2010 GT here with 19k miles. Diff whines a little starting at about 35mph, the whine gets louder as speed increases, and is apparent only under load. At coasting, there is no whine.</p><p></p><p>Diff whine indicates something amiss, so I started by changing diff fluid; old fluid was dirty and had small amount of metallic dust mixed in. Looked around and things appear OK in there, but I measured backlash and it is .017". So my questions are:</p><p>1) Should I plan on entire rebuild?</p><p>2) Or can I get away with just adjusting backlash back to specs?</p><p>3) Pinion preload is likely zero by now. How critical is that?</p><p></p><p>My basic plan is to re-use all existing parts; adjust backlash to factory spec (I would shoot for .008" to .010"), and then use marking compound to check ring/pinion mesh pattern. Assuming mesh pattern OK, would that suffice for most of you?</p></blockquote><p></p>
[QUOTE="Mojo88, post: 15694200, member: 184279"] 2010 GT here with 19k miles. Diff whines a little starting at about 35mph, the whine gets louder as speed increases, and is apparent only under load. At coasting, there is no whine. Diff whine indicates something amiss, so I started by changing diff fluid; old fluid was dirty and had small amount of metallic dust mixed in. Looked around and things appear OK in there, but I measured backlash and it is .017". So my questions are: 1) Should I plan on entire rebuild? 2) Or can I get away with just adjusting backlash back to specs? 3) Pinion preload is likely zero by now. How critical is that? My basic plan is to re-use all existing parts; adjust backlash to factory spec (I would shoot for .008" to .010"), and then use marking compound to check ring/pinion mesh pattern. Assuming mesh pattern OK, would that suffice for most of you? [/QUOTE]
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Changed diff fluid, backlash at .017", what to do?
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