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.
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