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I would do it if you can, it should hit 140k no prob without a change but overall last longer with a couple of oil changes, at least I think so, the clutch plates are carbon (not sure about the 8HP70d) but getting rid of some of those particles should slow down wearing bushings out.
I have done oil fill on a 6hp19 after changing solenoids not sure if it is same procedure but need to fill and seal transmission within specified temp range, easy to do on a lift but harder on the ground.
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87 930,
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