Posted to the email list:
> I am interested in converting my car '86 GN to > the 12" discs with the Global West tubular
> upper control arm kit and I have a couple of
> questions about such a conversion. Why do the F > body spindles and hubs are limited to
> those model years ending in early 90s, I can't
> remember the exact years at the moment. Is
> there something about the last version of the F > body's suspension that precludes from being
> used? While there is a lot of documentation on > the front brake conversion in the Tech Articles > I can't find anything on converting the rear
> brakes to discs. Did I miss something? I would > think that an F body would be
> the logical donor for this conversion...???
> I would appreciate your cements.
> Regards
> Jorge
> 86 GN
Jorge,
The Global West upper A's + B-body brakes use the 89-92 1LE rotors because: They have the 4.75" bolt pattern for the wheels. They also are identical to a 79-96 B-body 12" rotor, except for bolt pattern. These rotors are matched to the bearings used on 79-96 B-body, 79-92 F-body, and 79-88 A/G-body.
I hope that sufficiently answers your question.
The 93-up F-bodies use a sealed hub that bolts to the spindle. This is very unlike the B-body spindle, and would take enormous effort to adapt, in comparison.
As far as rear discs, I would go with Baer, or I would install a wider differential. The wider diff. will make using 89-97 F-body rear discs cake, as it will allow them to bolt up *and* retain the emergency brake.