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irs question
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<blockquote data-quote="ac427cobra" data-source="post: 7832679" data-attributes="member: 6247"><p>In 1999 the halfshafts on the IRS contained a 28 spline inner shaft. This is determined by the gear carrier inside the differential. The 28 spline halfshafts were the weakest halfshafts of all IRS years. In 2001 the halfshafts were beefed up slightly and the inner spline was updated from a 28 to a 31 spline. In 2003 the halfshafts were once again upgraded to a heavier unit but still retained the 31 spline inner. ALL halfshafts from ALL years retain the same 28 spline outer that goes through the hub in the rear knuckle.</p><p></p><p>The early 1999 and 2000 Cobra R models had knuckle cross axis joints that were pressed in and did not have a flange and retaining ring holding them in. These were all recalled and updated with the retaining ring style cross axis joints.</p><p></p><p>The biggest problem all IRS owners have is neglecting to keep the rear hub to halfshaft retaining nuts torqued to 240-250# on a REGULAR basis. The torque is required for bearing pre-load. This neglect leads to destroyed rear knuckle bearings and damaged rear hubs. </p><p></p><p>FWIW</p><p></p><p>:thumbsup::coolman::beer:</p></blockquote><p></p>
[QUOTE="ac427cobra, post: 7832679, member: 6247"] In 1999 the halfshafts on the IRS contained a 28 spline inner shaft. This is determined by the gear carrier inside the differential. The 28 spline halfshafts were the weakest halfshafts of all IRS years. In 2001 the halfshafts were beefed up slightly and the inner spline was updated from a 28 to a 31 spline. In 2003 the halfshafts were once again upgraded to a heavier unit but still retained the 31 spline inner. ALL halfshafts from ALL years retain the same 28 spline outer that goes through the hub in the rear knuckle. The early 1999 and 2000 Cobra R models had knuckle cross axis joints that were pressed in and did not have a flange and retaining ring holding them in. These were all recalled and updated with the retaining ring style cross axis joints. The biggest problem all IRS owners have is neglecting to keep the rear hub to halfshaft retaining nuts torqued to 240-250# on a REGULAR basis. The torque is required for bearing pre-load. This neglect leads to destroyed rear knuckle bearings and damaged rear hubs. FWIW :thumbsup::coolman::beer: [/QUOTE]
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