Those two components are cheap and easy to replace. Given you have done the rest, why not do them and that way you know the age/mileage on all driveline parts. However...
I replied to an earlier posting of yours with this problem. I think your issue remains the clutch from what you describe. I wonder whether it needs to bed-in?
Are you also clear that the engine rear bearing is sound and the gearbox input bearing and/or seals?
Also, have you checked/changed gearbox and diff oils?
Keep us posted!
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