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89 FSB ford 8.8. Do all our broncos have 31 spline? other than counting the splines on the axles, is there any other way to tell?
 

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Yea fullsize 8.8's are 31 spline some mustangs and rangers are 28 spline, but there is a difference in cross pin size in the fullsize axle's 3/4 and 7/8. I think the cut off on the small pin was 1986 or something.
 
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