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1993-1995 ABS spindle, hub, bearing info
#803303 May 05th 2023 5:54 pm
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I learned the hard way that there are two different 5-lug ABS front spindles for 93-95. I went and got a used rotor to swap out off a '95 and used it as it came. Put it on and the nut on mine was different, smaller, but it all went together and seemed to fit with no wobble. But I couldn't get it tight, it would seem to loosen up. Well, sometimes they don't quite seat the first time, but after four times what finally happened is the outer bearing blew up. And I mean blew up, blew the cap off, rollers all fell out.

Lo and behold, the bearing is also larger and why that didn't occur to me to check when I put it on I don't know. I've been on the fatigued side the last few weeks and have made some dumb mistakes. But I looked online and everybody shows one rotor and one inner and one outer bearing for these vans. Clearly there's not. I think the inner is the same, but the outer is different.

So I limped it home 7 miles at about 25 mph and it welded the big washer to the spindle nut, dug up some of the threads, and the nut threads are just gone. I bought a new nut and this is the first indication anywhere I've seen there's a difference, when you look them up you get two options.

Luckily I was able to put the old rotor back on and I used the new nut to kind of chase the threads, turn it a bit, turn it back, turn it, but I had to clean the baked on old grease off the spindle with a wire brush and knock down a couple of high spots. Probably should replace it, but right now the only ABS van anywhere around is the same one I took the rotor with the wrong bearing off from, so I'd have a mismatch up there. I don't think it's going to break, but I won't be doing the slalom with it anytime soon.



FWIW in a pinch an ABS rotor will go on non-ABS, but the same deal - the outer bearing is bigger, I think the spindle is a tad longer on the ABS equipped version. Did that once too. It will creak and groan a little, but you'd make 100 miles with it.


1994 G20
2002 Express, sitting dead
1988 G20 conversion, stored
Re: 1993-1995 ABS spindle, hub, bearing info
pontiac59 #803375 May 08th 2023 11:38 pm
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I have looked these up many times working for Oreilly auto parts. Strictly speaking on the G20 van here within that date range, the difference in the spindle or knuckle the bearing and rotor from the factory was whether the van used hydroboost or a vacuum boost brake system. The vacuum boost system used the smaller bearing diameter. The hydroboost brake system used the larger bearing diameter. All 3 components have to match for a given application. I also believe the hydroboost setups were all 4 wheel ABS with the ABS pump "frame" mounted under the van. The vacuum booster setups were rear wheel anti-lock only and had the RWAL pump assembly under the master cylinder on the firewall.

The G10 vans traditionally atleast in years prior to 1993 have a different spindle/knuckle, inner bearing and rotor than the G20 van as well. The G10s use a smaller A3 inner bearing, same as the outer. The typical pre 1993 G20 van uses an A3 and A5 bearing combination.

I will also add this disclaimer, the diesel vans may have been different, but I refuse to own one of those Detroit junkers as I prefer a good old small block or big block rather than a failure prone oil burner. The diesels also nearly completely disappeared close to 20 years ago here, $5/gallon low sulphur diesel in 2007 had dozens of them in every salvage yard you went to. I was looking for some TBI parts for a swap I was working on at the time and one yard I went to had an entire row of double stacked diesel G20 and G30 vans and not a gas engine van in sight. The fleet guys were auctioning them off to the junkyards daily.

Last edited by 1983G20Van; May 08th 2023 11:50 pm.

1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
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Re: 1993-1995 ABS spindle, hub, bearing info
pontiac59 #804318 June 12th 2023 3:56 am
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I don't think I've ever seen a hydroboost G20 but I'd guess the diesel needs it as less vacuum. Mine has the ABS unit on it, I suspect they were standard.

The van I picked on also had the ABS unit but somebody had removed that, the engine, the entire nose off it (cut off with sawzall) and some other bits. Maybe it had the hydroboost on it and I missed it.

I'm not even sure the rotor is different although I see some indicate hydroboost or vacuum.


1994 G20
2002 Express, sitting dead
1988 G20 conversion, stored

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