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SportTrac Discussion
Engine & Drivetrain
Driveshaft
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<blockquote data-quote="Yardsale " data-source="post: 1021323" data-attributes="member: 58988"><p>I did both - rebuilt and balanced both driveshafts and replaced the rear with the Ford aluminum (along with a bunch of other stuff); no difference.</p><p></p><p></p><p></p><p>The speed of your vibration isn't that noted in the TSB (75 to 80). And the TSB applies to vehicles with 4.10 differentials. Mine came with 3.83 and there was a vibration above 85. I changed tires sizes and then ratios to 4.10 and the vibration speed reduced to about 70 (TSB now applies).</p><p></p><p></p><p></p><p>I have an intermittent vibration at 65 to 75 MPH, most noticeably when the road curves slightly right. Check upper and lower control arm bushings. Mine need to be replaced.</p></blockquote><p></p>
[QUOTE="Yardsale , post: 1021323, member: 58988"] I did both - rebuilt and balanced both driveshafts and replaced the rear with the Ford aluminum (along with a bunch of other stuff); no difference. The speed of your vibration isn't that noted in the TSB (75 to 80). And the TSB applies to vehicles with 4.10 differentials. Mine came with 3.83 and there was a vibration above 85. I changed tires sizes and then ratios to 4.10 and the vibration speed reduced to about 70 (TSB now applies). I have an intermittent vibration at 65 to 75 MPH, most noticeably when the road curves slightly right. Check upper and lower control arm bushings. Mine need to be replaced. [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Driveshaft
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