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Discussion Starter #1
Are all 8.8 ring and pinion gears interchangable? I can take 3.73 gears out of any 8.8 rear end and put them in the T-bird IRS right?
 

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yes as far as gears go 8.8 is 8.8!
 

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Discussion Starter #3
I was just making sure. Someone told me before that the pinion shaft was longer on the IRS setup. I didn't fully believe him, but I wanted to make sure before I spent any money.
 

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I thought spline count was important, like ours have 28 splines and Mustangs have 31.
 

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The splines for the the halfshafts are in the carrier not the ring and pinion
 

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What if I was to get a Trac-Lok rear end or whatever the limited slip rear-end in the '99+ cobra's, would it have the same spline as the t-bird/cougars?

Clay
 

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No, only the 99's have 28 spline, after 99 they went to 31 spline.
 
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