Escort speed sensor question

I am trying to remove the speed sensor and it does not seem to want to budge. I haven't really reefed on it yet out of fear of breaking the unit.
Does anyone know what metal the base is made out of? I ask to try to find
out if I am wasting my time trying to take it out (i.e. steel sender &aluminum transaxle fused together through corrosion).
I need to top up the transmission fluid after having lost some due to a halfshaft replacement. Saying that, can I inject fluid through the speedometer cable hole? I can measure the amount of fluid lost & add an equivalent amount.
Thanx,
Ray
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unit.
Good luck finding an answer...I've got the same problem (mine is flaky but it seems nothing short of explosives will probably get it out so I have to put up with it).
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