The 126, IIRC, has a connection on the differential. I'd check that plug. Also, the ABS sensors might be included and need a clean hub to work best. You might have gotten the notches on the front hub dirty. An air gun should help to clean the gunk out of the grooves.

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There is a very fine line between "hobby" and "mental illness."
FrankenBenz: '87 560SEC with an '02 cammed LS6 and custom 4L60E.
Bling: '87 560SEC, ported/polished, lowered
Lisa: '87 560SEL, lowered