I'd bet it's the gearbox, but it's easy enough to check the rest of the "stuff" first.

FYI, if you need a steering gearbox, make sure it was a rebuilt from "C&M Hydraulics". Chris completely disassembles the box and his crew puts them back together right.

No affiliation, etc., he's just a good guy.

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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