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Dear Simon,
May this find you well. Parts data from Volvo VADIS (the now-superseded dealer parts/maintenance database) show that the hubs are different and do not interchange, as between the 1985-87 740s, and the later models.
In the earlier models, the hub and brake rotor were combined. In the later models, the hub - which houses the bearing - was separate from the rotor.
Doing this makes sense: hubs are good for 200-300,000 miles. Rotors do not last that long.
The hub, for a 1986 740 is Part #3516126. The hub, for a 1989 or later 740 is Part #271644. Both of these parts are for cars with ABS.
For 740s, the strut housings, from which the stub axle protrudes, are also different:
1986: 1330826 or 1330827
1992: 1359840 or 1359841.
So far as I know, bearings for the later hubs are not available separately. If the bearing fails, the entire hub must be replaced.
I hope this is helpful.
Yours faithfully,
Spook
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