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Topic: Rear End Camber Adjustment

in Forum: C3 Engines, Driveline and Handling


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Rear End Camber Adjustment

Posted: 8/8/08 4:24pm Message 1 of 11
jp75vette
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Bloomfield Hills, MI - USA
Joined: 6/29/2008
Posts: 199
Vette(s): 1975 Corvette coupe, 4 speed manual, 383 ci 9.5:1,Edelbrock dual plane Air Gap intake, Alum Heads,Comp Cam, roller Rockers, PS,PB,Tilt
I just relpaced the differential on my 1975 Corvette. How can I  do an adjustment of the camber?


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Rear End Camber Adjustment

Posted: 8/8/08 7:50pm Message 2 of 11
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20225
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
The camber adjustment is made with the two eccentric bolts that hold the strut rods to the diff. Loosen the nuts, and turn the bolts, and this will move the bottom of the tire/rim in or out.
It's not too hard to get close just by eyeballing, but it would be best to have a final alignment done at a qualified shop. But, if you're jus trying to get the camber set good enough to drive, then just eyeball it from the rear, and give the tops of the tires just a wee bit of tilt in.
You can set the camber really close with a spirit level, if you have a good, level surface in your garage/driveway. If you happen to have a level with an angle meter built in, even better! Just place the level firmly against the rim, and adjust the camber bolts until it has about 1/4" negative camber. The level needs to contact the edge of the rim, top and bottom, so you may need to tape a block of wood, such as a 2x4 to the level, in order to get it to set nice and flush against the rim.
While this method ain't perfect, it's pretty dang close!
hth



Joel Adams
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Rear End Camber Adjustment

Posted: 8/8/08 9:42pm Message 3 of 11
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rraider1
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Woodland, WA - USA
Joined: 10/14/2003
Posts: 1171
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion
I have a vibration in my 77 at 60 MPH has anybody heard of this service buletin its pretty close to what I feel
 
1973 - 1977: Service Bulletin: Vehicle Vibration During Acceleration

Subject: Vehicle Vibration During Acceleration
Model and Year: 1973-1977 Corvette
Source: Chevrolet Dealer Sevice Technical Bulletin
Bulletin Number: 77-T-48
Date: July, 1977

TO:  ALL CHEVROLET DEALERS

Customer complaints of vibration on acceleration which are not corrected by conventional methods, may be caused by the rear drive wheel(s) camber angle.

The typical Corvette torque shake is a vibration which occurs in the steering wheel and can also be felt in the floor pan and seat peaking at 55-60 MPH.  This condition is also related to drive torque, that is, the vibration can be noticed during acceleration, but not during coast.

Torque shake can be corrected by readjusting the rear wheel camber to 00 from the normal specification of -1/20 +/- 1/40.

 




Rear End Camber Adjustment

Posted: 8/9/08 8:26am Message 4 of 11
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20225
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
Too much camber in either direction will throw the u-joints out of whack, and create strange vibrations under acceleration.


Joel Adams
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(click for Texas-sized view!)             NCRS

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Rear End Camber Adjustment

Posted: 8/9/08 12:05pm Message 5 of 11
jp75vette
Former Member
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Bloomfield Hills, MI - USA
Joined: 6/29/2008
Posts: 199
Vette(s): 1975 Corvette coupe, 4 speed manual, 383 ci 9.5:1,Edelbrock dual plane Air Gap intake, Alum Heads,Comp Cam, roller Rockers, PS,PB,Tilt
I made the camber adjustment as indicated. I also found a detailed article that describes how to do this with steel plates and round rods so that tires have weight on them and can freely move in and out. I used a 2*2 piece of wood to fit on the edge of the wheel rim, add 1/4" piece of wood at the top for the right camber and it was pretty simple to do.
 
jp75vette2008-08-09 12:22:33


Rear End Camber Adjustment

Posted: 8/9/08 6:49pm Message 6 of 11
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rraider1
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Woodland, WA - USA
Joined: 10/14/2003
Posts: 1171
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion
Way Cool pretty soon We need no sticken mechanic


Rear End Camber Adjustment

Posted: 8/10/08 4:59pm Message 7 of 11
ranger3
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North Charleston, SC - USA
Joined: 3/20/2004
Posts: 4176
Vette(s): 1975 L48 AT AC T-top
After reading the procedure I thought I would throw out a warning. Do not raise the wheels of your Vette off the ground and idle the engine with the transmission in gear. That's a great way to tear up u-joints and other things if it breaks while running. If the trailing arms are not supported, in the normal driving position, the half shafts are in a steep angle and damage will occur.

Scott


Rear End Camber Adjustment

Posted: 8/13/08 6:27am Message 8 of 11
sgm2004
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Falls Church, VA - USA
Joined: 3/22/2006
Posts: 232
Vette(s): 1975, 4 speed, L48, NOW Silver mist, Oxblood inside 2003 50th Av Torch RED little brother to 75
GOOD Stuff Thanks all.
 
Guy



Rear End Camber Adjustment

Posted: 8/13/08 6:42am Message 9 of 11
sundevil74
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Leavenworth, KS - USA
Joined: 1/24/2007
Posts: 426
Vette(s): MM Red 1971 T-top,LS5,4-speed, black leather C5 seats, Hooker sidepipes. Previous: 64 Coupe, 65 Roadster L76 / N14
FYI, the camber of 1/4 inch is total.  That means 1/8 inch on each rear wheel. 
 
Been doin' lots of research 'cause I've got to set up the entire rear end after new u-joints, spring, T/As, bushings, and checked diff.



Rear End Camber Adjustment

Posted: 8/13/08 6:55am Message 10 of 11
sundevil74
Former Member
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Leavenworth, KS - USA
Joined: 1/24/2007
Posts: 426
Vette(s): MM Red 1971 T-top,LS5,4-speed, black leather C5 seats, Hooker sidepipes. Previous: 64 Coupe, 65 Roadster L76 / N14
Disregard the last post on camber.  Need to make correction before the experts catch my gaff!!  Guess I need to go back to the books.  Confused
 
I was confusing the TOE-IN, which is a total reading.  Divide TOE-IN by half to get reading per wheel.
 
BTW, since camber is measured in degrees, how did you guys come up with 1/4 inch???  Is there a conversion chart out there?  I've seen a suggested camber readings of zero to negative 1/4 degree, but not in inches.



in Forum: C3 Engines, Driveline and Handling


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