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7/16/11 9:21pm - Original Message: 'Rear wheel loose'
Shawnee2
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Cherryville, NC - USA

Vette(s):
82 Collector

Joined: 1/10/2011
Posts: 78
Jacked up the passenger side and grabed the rear wheel at 12 & 6 and have quit a bit of play.  Do not really have any at the 3 & 9 position.  Thought it was the u-joints, so I changed them out today on both sides and still have the same issue.  The driver side does not budge.  Are my bearings bad or what can cause this? 
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7/16/11 10:24pm - Reply: 'Rear wheel loose'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
A worn diff yoke can cause this. The play is from the yoke moving in/out of the the diff when you move the tire/wheel.
Usually, worn bearings will give you play in both directions(12/6 & 3/9). If you can get a helper, crawl under and watch the yoke while the helper moves the tire/wheel. I bet you see the yoke moving in/out.


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Joel Adams
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7/16/11 10:39pm - Reply: 'Rear wheel loose'
Shawnee2
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Cherryville, NC - USA

Vette(s):
82 Collector

Joined: 1/10/2011
Posts: 78

You are referring to the yoke coming out of the the diff and not at the wheel right?  I looked at the yoke area at the wheel and that area appears to move around some.  Did not look at the diff yoke.

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7/17/11 12:00pm - Reply: 'Rear wheel loose'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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If the diff yoke is worn, you will see some movement at the wheel/trailing arm end too, but what you'll see is the entire trailing arm/spindle/hub moving...not play in the bearings. You'll want to check for in/out movement at the diff end, where the yoke goes into the diff. There will always be some movement there, but if it is enough to actually feel it from the wheel end, it's prolly too much.
Due to the design of the rear suspension, when the diff yoke end wears, there is nothing to really keep the trailing arm from having any play in it with the rear in the air. You won't be able to notice any 3-9 o'clock play, since the t-arm is anchored at the front by the bushing/bolt, and at the rear by the strut rod. But...when checking at the 12-6 o'clock position, the wheel can move in/out, since the yoke wear will no longer keep the play to a minimum. The bottom of the wheel is still anchored by the strut rod, but the top uses the yoke, and half-shaft as a part of the suspension, so any wear in the yoke will cause play. How much is too much has been debated for years, and I know of no published specs for the allowable amount of play.
Hope some of that makes sense.

There is always the possibility of having bearing play, too...don't get me wrong. My point was that IF the bearing has too much play, you will get movement from checking at both the 12-6 position AND the 3-9 position.



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Joel Adams
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7/17/11 8:56pm - Reply: 'Rear wheel loose'
Shawnee2
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Cherryville, NC - USA

Vette(s):
82 Collector

Joined: 1/10/2011
Posts: 78

Joel,  The only place that looks like it is moving is at the yoke on wheel side of the 1/2 shaft.  I do not see any movement at the diff, only at the wheel.  Should I pull the shaft to see if I have any movement ot the diff yoke?

Shawnee22011-07-17 17:58:16
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7/17/11 10:30pm - Reply: 'Rear wheel loose'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
IF you have movement at the wheel end, and you're sure the whole t-arm is not moving, then you prolly do have some bearing play. Removing the halfshaft will make it harder to check, since the t-arm itself would be able to move more.
If you can actually see the flange on the wheel end moving, how much play does it have? Technically, there should be NO play at all in the bearing assy. You can get by with some, but usually not forever.

You should also take a good look at the bushings on the strut rod. Worn bushings could also allow some movement of the t-arm.
Adams' Apple2011-07-17 19:32:54

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Joel Adams
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8/12/11 11:26am - Reply: 'Rear wheel loose'
Barkingowl Lifetime Member
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CHARLOTTE, NC - USA

Vette(s):
1974 Stingray coupe; 2nd-Year One crate engine 408/408 2000 DBGM C5 coupe: Stock

Joined: 6/18/2003
Posts: 394
I just experienced the differential yoke play on our '74. I ordered some new Yokes from Eckler's now to install them.

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8/12/11 11:40am - Reply: 'Rear wheel loose'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
This is what was discovered on mine when I went to put first set of new tires, both side would go in and out. Required differential rebuild. This was something I did not attempt, check past post but not easy. You should replace with hardened yoke to prevent this from happening in the future. If I understand the cause it is from the yoke going in and out and impacting the pumpkin and wearing the ends of the yoke. eventually the keepers can come off and the yoke come out not good. Experts chime in but I would get a new or rebuilt diff. it takes special tools to set up the clutch packs inside? I have a pdf file on how to rebuild if needed. rraider12011-08-12 09:39:46

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Bob R
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8/12/11 2:56pm - Reply: 'Rear wheel loose'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1895
Big smile  Ya picked a FINE time to leave me LOOSE WHEEL.   Carlisle is coming. Ouch

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8/12/11 4:20pm - Reply: 'Rear wheel loose'
Jaws79 Lifetime Member
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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4211
Yeah, we gotta get these cars in shape for the big show! Let's get busy!!!!
 
Barry
 
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8/12/11 4:26pm - Reply: 'Rear wheel loose'
GR8WYT Lifetime Member
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Spring, TX - USA

Vette(s):
1978 Silver Anniversary Pace Car (L82)

Joined: 10/6/2010
Posts: 66
"  Ya picked a FINE time to leave me LOOSE WHEEL "   EXCELLENT but I'm not believing  you really posted it, Kenny, er uh Barry

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8/12/11 9:05pm - Reply: 'Rear wheel loose'
anips
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sonoma, CA - USA

Vette(s):
72 LT-1 AC coupe,69 l-36 coupe

Joined: 8/9/2002
Posts: 783
would it be easier to tell if you pulled the caliper.

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8/13/11 9:23pm - Reply: 'Rear wheel loose'
Jaws79 Lifetime Member
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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4211
[QUOTE=GR8WYT] "  Ya picked a FINE time to leave me LOOSE WHEEL "   EXCELLENT but I'm not believing  you really posted it, Kenny, er uh Barry[/QUOTE]
I didn't post it! Mark did! But it is funny though, if not paticularly helpful! Sorry if we're off topic!
 
Barry
 
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8/13/11 10:40pm - Reply: 'Rear wheel loose'
Okie Dude Lifetime Member
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Eastern Oklahoma County, OK - USA

Vette(s):
1980 Black L48 T-Tops

Joined: 1/3/2006
Posts: 1560
I went ahead with the full meal deal on mine and had the complete trailing arms rebuilt along with changing out the strut rods, KYB shocks, u-joints, parking brake, new seals all the way around the pumpkin, clutches redone and fresh GM lube.  Had to rebuild due to popping in the rear end on a left hand turn at low speed. 

Course, I woulda had to have had it done anyway since Joel built me a bullet-proof 700R4.  Tranny makes all the difference in the world.  Hookup is awesome!

I have found that just fixing one thing in the rear end will only make the next weakest link in the chain fail.  Trust me, that is true no matter where you are working on the car (see my previous posts).

Good luck!Thumbs Up


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Dennis Smith
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