1.5" each side.
The 94-98 axles make the standard 86-98 axle 3/4" wider each side.
The 99-04 housing is wider as well, do it comes out to 1.5" each side or 3" total
Also, keep in mind the LCA bolt hole sizes differ. I believe the newer rears are 16mm bolts while the older are 14mm. I could be wrong about the sizes
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