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Username Post: camber and caster adjustment        (Topic#173197)
blackhawk 
Forum Newbie
Posts: 28

Loc: Virginia
Reg: 02-07-07
10-26-07 06:43 PM - Post#1282584    

I just bought new tires today and had the tire shop do a front end alignment. I have a 99 Silverado 2500 4WD. I specifically asked for the cost of the alignment so that there would be no surprises. I left my truck at the shop after lunch. I got a call from the service manager later in the day. He said that my camber and caster were way out of adjustment and that this required them to replace some pins and new shims. I was told that this costs an extra $40. I told him that I already had the job priced and this was not part of the deal. Anyway, he backed off and said that he would do it for the price that I was told. I have a factory service manual for my truck. I can't find anywhere in the adjustment procedure that says shims are used. It mentions to remove the "pinned adjusting cam insert". Then it says "do not reinstall the cam insert". But then it doesn't say anything about installing a new one. Was this tire shop trying to rip me off? I can tell that they actually adjusted the caster and camber settings. Is this cam insert something that comes from the factory and not needed after an adjustment is made?

While I was checking out the above, I noticed that there was a foam bumper mounted on the upper control arm. It was nearly disintegrated. Are these worth replacing?
99 Silverado 2500 4x4


 
black95jimmy 
"7th Year" Silver Supporting Member
Posts: 8676
black95jimmy
Age: 63
Loc: Venice, FL
Reg: 01-05-02
10-26-07 06:51 PM - Post#1282592    
    In response to blackhawk

"closed cell polyurethane" bump stops.
Replace them because they work in conjunction with the spring. In other words they deccelerate the upward motion.

They are no longer used as just a component to stop the shock absorber bottoming out but an important part of the spring and damper package contributing to the overall handling of the car.

With advances in polyurethane technology the bumpstop has become an integeral part of the chassis. Now vehicle manufacturers are using them as secondary springs to control ‘on the limit’ handling.

82 Monte Carlo SC, 355 w/Vortec heads, roller rockers, 670 Street Avenger, Pypes true duals.
2000 Sub.5.3L 40 Gallons of gas @ $3.28/gal. bla bla bla.


 
2003YukonXL 
Senior Member
Posts: 1467
2003YukonXL
Age: 34
Loc: Sumter, SC
Reg: 04-03-04
10-26-07 09:34 PM - Post#1282677    
    In response to black95jimmy

Yes, replace your bumpstops if they're worn out or disintegrated. As far as the camber adjustment goes, that can be affected by adjusting the torsion bars as so many of us do. I think caster is adjusted using the same points, if not then it's probably not adjustable unless you adjust the t-bars to change the angle of the truck relative to the road, changing caster by proxy. No shims I'm aware of, but the camber cams have pins to guide the adjuster plates, they're just nylon ones, fairly easy to break.
Jake Brodersen
2006 Ford Explorer XLT 2WD (The Wife's)
2005 Pontiac GTO 6MT (My Toy)
2003 GMC Yukon XL SLT 4WD (The Family Hauler)


 
blackhawk 
Forum Newbie
Posts: 28

Loc: Virginia
Reg: 02-07-07
10-27-07 07:09 AM - Post#1282796    
    In response to 2003YukonXL

Thanks for the replies. Does anyone know what the "cam inserts" are that the manual is talking about?

Is there any reason a camber and caster adjustment should cost extra? It seems to me that this would be common to a front end alignment job.
99 Silverado 2500 4x4


 
2003YukonXL 
Senior Member
Posts: 1467
2003YukonXL
Age: 34
Loc: Sumter, SC
Reg: 04-03-04
10-27-07 07:24 AM - Post#1282808    
    In response to blackhawk

I've had many shops tell me it's extra. The catch is that most shops offer a "thrust angle" alignment. All this entails is pointing the front wheels in a straight line with the rear wheels. No effect on the caster/camber as far as that goes. They do check these but many will charge extra since they see an opportunity to make an extra buck.
Jake Brodersen
2006 Ford Explorer XLT 2WD (The Wife's)
2005 Pontiac GTO 6MT (My Toy)
2003 GMC Yukon XL SLT 4WD (The Family Hauler)


 
Bad Bowtie 
Valued Contributor
Posts: 4514
Bad Bowtie
Age: 42
Loc: TX
Reg: 07-04-03
10-29-07 01:54 PM - Post#1284306    
    In response to 2003YukonXL

I know that on the 1988-99 OBS trucks the 1st alignment was the "expensive" one because the factory adjustments had to be chiseled-riveted out, then a new adjustable "devise" or cam was installed to do a FULL alignment. Maybe the 1999 NBS-2006's are that way as well. I see the plastic looking "knock outs" u guys are referring to on each side...
GMC. We are Professional Grade.

http://www.cardomain.com/id/2004VHO


 
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