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The shaft u-joints don’t have zerk fittings as far as I know. What I have done is spray WD-40 all over the u-joint while rotating the steering wheel lock to lock for a few minutes. It is probably rust on the outside that is causing the stiffness. Focus on the lower one as that is normally the troublesome one since it is very exposed to road grit and grime etc. Some folks follow this up with spraying penetrating oil on the u-joint.
I don’t know what synthetic ATF is compatible with type F. I used Mobil 1 synthetic ATF in my 850’s PS system. I have read here that 240 owners have used it with success.
Wish I had learned all this before I had to replace both the rack and lower shaft u-joint on my 90 240 years ago.....
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Will I buy another Volvo??? We'll see....
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