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Old 05-14-2006, 09:17 PM   #41
CentralCoaster
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Location: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
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Quote:
Originally Posted by Tom Piper
I've heard that the C4 rear wheel bearings are the same wheel bearings that were used on the front of the A-body (Pontiac 6000) front wheel drive vehicles in the '80s-- I've never confirmed this.

Photos below, but nevermind, the bolt pattern is 5x4.58 (HD) and even less for light duty, not 5x4.75.


82 Pontiac 6000 front bearing is the same as the
85 Pontiac 6000 STE w/ light duty brakes:
http://198.208.187.182/internet/Part...cpartnbr=20-5K


85 Pontiac 6000 STE w/ heavy duty brakes is a different p/n:
http://198.208.187.182/internet/Part...rtnbr=20-94TPK

Last edited by CentralCoaster; 05-14-2006 at 09:24 PM.
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Old 05-14-2006, 09:51 PM   #42
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I did some research and came up with these as potential substitutes:

BCA#
513009
513013
513019
513020
513061
513085
513090




513019, 84-90 Corvette front PICTURE
5x4.75 FlangeDia=5.78 WheelPilotDia=2.76 BrakePilotDia=2.78 FlangeOffset=2.72 HubPilotDia=2.83 Flange=Rectangular (Front wheel has ABS with tone ring sensor)

513009, 82-84 Buick/Caddy/Olds sedans PICTURE
5x4.75 FlangeDia=5.78 WheelPilotDia=2.76 BrakePilotDia=2.78 FlangeOffset=2.72 HubPilotDia=2.83 Flange=Rectangular
$88 at Autozone

513085 91-96 Corvette front PICTURE
5x4.75 FlangeDia=5.79 WheelPilotDia=2.76 BrakePilotDia=2.78 FlangeOffset=2.72 HubPilotDia=2.83 Flange=Rectangular (Front wheel has ABS with Integral Sensor)

513090 93-02 F-bodies, 97-00 S10 PICTURE
5x4.75 FlangeDia=5.79 WheelPilotDia=2.76 BrakePilotDia=2.78 FlangeOffset=2.72 HubPilotDia=2.79 Flange=Rectangular (Front wheel has ABS with Integral Sensor)


513020 84-96 Corvette rear PICTURE
5x4.75 FlangeDia=5.689 WheelPilotDia=2.761 BrakePilotDia=2.781 FlangeOffset=1.861 HubPilotDia=3.209 Splines=27 Flange=ModifiedTriangle

513013 83-93 S10/Blazer 82-85 Olds/Buick/Caddy sedans PICTURE
5x4.75 FlangeDia=5.69 WheelPilotDia=2.76 BrakePilotDia=2.78 FlangeOffset=1.86 HubPilotDia=3.21 Splines=27 Flange=ModifiedTriangle
$87 at Napa, $61 at wheelbearingsinc.com

513061 91-97 S10/Blazer PICTURE
5x4.75 FlangeDia=5.69 WheelPilotDia=2.76 BrakePilotDia=2.78 FlangeOffset=2.93 HubPilotDia=3.21 Splines=27 Flange=ModifiedTriangle

Last edited by CentralCoaster; 05-14-2006 at 10:53 PM.
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Old 05-15-2006, 03:32 PM   #43
msessine
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I took my 87 to front end shop to do a wheel alignment and they told me they could not do it cause the rear wheel bearing was gone. I replaced it along with the control arm bushings and had the same play, in my case it is not the wheel bearing. With the help of a friend and a lift you can see the knuckle moving which means the bearing is tight. I was told by a GM mechanic who ownes a corvette that a badley worn u-joint can cause this problem. I am putting in a new halfshaft with new spicer u-joints. I will update when I am done.
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Old 05-15-2006, 06:49 PM   #44
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Unfortunatley, the U-joints are not my problem. It is the bearing, and I can see it move in relation to the knuckle. I really still think I have bad bearings from GM. I looked at another car today that had rear drive and independant suspension. The only difference between this and a Vette is it did not use the axle as a suspension link and had a CV joint instead of a solid U-joint. Anyway, the result was no play in the hub what so ever.

You know I could understand actually having a little in/out play, but this is not the movement I get. I am grabbing the wheel at 12 and 6. At 6 I am lifting up and away from the car. At 12, I am pushing in. This is cocking the bearing so to speak. About the only other way I could describe it would be to say the bearing is acting like a ball joint....I am getting a wobble motion, but not in and out. I can get this motion at any two points on the wheel 12/6, 9/3, 7:30/1:30.

It just doesn't seem right!!!!!!
FYI: Corvettes finished 2nd and 3rd overall at the Houston Grand Prix this past weekend. Only being beaten by the Audi R8 which is in a whole different class. Go Corvettes!!!!!!
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Old 05-15-2006, 07:10 PM   #45
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Quote:
Originally Posted by Z~max
Unfortunatley, the U-joints are not my problem. It is the bearing, and I can see it move in relation to the knuckle. I really still think I have bad bearings from GM. I looked at another car today that had rear drive and independant suspension. The only difference between this and a Vette is it did not use the axle as a suspension link and had a CV joint instead of a solid U-joint. Anyway, the result was no play in the hub what so ever.

You know I could understand actually having a little in/out play, but this is not the movement I get. I am grabbing the wheel at 12 and 6. At 6 I am lifting up and away from the car. At 12, I am pushing in. This is cocking the bearing so to speak. About the only other way I could describe it would be to say the bearing is acting like a ball joint....I am getting a wobble motion, but not in and out. I can get this motion at any two points on the wheel 12/6, 9/3, 7:30/1:30.

It just doesn't seem right!!!!!!
FYI: Corvettes finished 2nd and 3rd overall at the Houston Grand Prix this past weekend. Only being beaten by the Audi R8 which is in a whole different class. Go Corvettes!!!!!!
Could this be movement that is occurring at the diff end of the stub axel? As previously stated the stub axel acts as the lower control arm in the IRS and inboard/outboard movement of the stub axel could cause the "loose" feel that you describe. sj
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Old 05-15-2006, 07:17 PM   #46
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Unfortunatley I have had three other people look at it just to see if I was missing something and it is in the wheel bearing. I even used a dial indicator between the hub and the knuckle. All the bolts were torqued and mating surfaces were cleaned and seating properly. I think it is just my luck. I seem to atract the weird Gremlins. I haven't had time to play with it anymore yet. And I was waiting to hear back from some other calls I made. If nothing else I will get my education on sealed wheel bearings.
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Old 05-15-2006, 07:33 PM   #47
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Quote:
Originally Posted by Z~max
Unfortunatley I have had three other people look at it just to see if I was missing something and it is in the wheel bearing. I even used a dial indicator between the hub and the knuckle. All the bolts were torqued and mating surfaces were cleaned and seating properly. I think it is just my luck. I seem to atract the weird Gremlins. I haven't had time to play with it anymore yet. And I was waiting to hear back from some other calls I made. If nothing else I will get my education on sealed wheel bearings.
If you decide to drive it the way that it is, be sure to have it aligned with a good amount of rear toe-in. These cars will toe-out a bit when they squat anyway... and add to that some looseness in the rear bearing and you'll likely get an unstable feeling. I think that 1/8 or even 3/16 total toe-in would be helpful. Happy motoring!
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Old 05-15-2006, 08:04 PM   #48
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It is kind of weird that you say that. My buddy made the switch to 275s for all 4 tires and wanted me to see the difference. (I have 255 fronts and 285 rears) I told him I needed more rear grip than more front grip. I was loosing the back end stability on exit. I just wander if that could actually have something to do with what I am feeling. (The guys laughed when I said this same thing, "You're crazy, that couldn't make that much difference!") Then again, maybe it's the loose nut behind the wheel? Hmmmmmmmmmm.............
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Old 05-15-2006, 08:04 PM
 
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Reload this Page 4 New wheel bearings and I still have play!!?
 
 
 
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