87-88 caster spec - alignment

i was at work putzing around with the alignment machine during some down-time

there are two different specs listed for the 87 and 88 tc's...the toe and camber are identical, but the casters are different.

87 is 1.15*, 88 is 1.35*

why is there a difference? arent the suspensions identical?

-james

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87 Thunderbird TurboCoupe - 2.3T, T5, 3.55L - K&N, 18psi - 16.14@88mph(2.37 60')
88 Thunderbird Sport - 5.0SO, AOD, 2.73L - 16.77@82mph(2.39 60')
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