Adjusting the ADJ PHB... Nut&String only way?
Thread Starter
Joined: Jul 2007
Posts: 2,861
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From: Ringoes/Flemington, New Jersey
Adjusting the ADJ PHB... Nut&String only way? Is this the only way to adjust a PHB? if I install my double adj PHB on an alignment machine, can I use the alignment machine to center the rear? is there a measurement I can follow or am I boned and have to use the damn string lol
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From: Tampa/Valrico, FL/ Chicago, IL
alignment rack is you best bet honestly.... i have done the string method and still was a little off, so we took it to my buddys shop threw it on the rack and it was close but still off.
Assuming you have no wheel spacers and identical off-sets on both the front and rear wheels ....
Spray a small area on the driveway with water, roll the car through it and compare the footprints left by the front and rear tires. Adjust the PHB till they are even.
Spray a small area on the driveway with water, roll the car through it and compare the footprints left by the front and rear tires. Adjust the PHB till they are even.
Thread Starter
Joined: Jul 2007
Posts: 2,861
Likes: 4
From: Ringoes/Flemington, New Jersey
I can do it myself. 
Im just curious to what I'm looking at on the machine. I havent set it up on the machine yet. Is it the total toe of the rear or something?
Im just curious to what I'm looking at on the machine. I havent set it up on the machine yet. Is it the total toe of the rear or something? Lower control arms will set thrust angle.
Toe is how much "bend" there is axle tubes. 0.6* toe/camber (depending upon the plane the bend is on) is considered factory tolerence according to published accounts from GM repair manuals. I'd actually like to see it myself, but ... The "bending" occurs during heating and cooling of the tube when the spring perch and LCAs brackets are welded in place.
PHB stabilizes the rear diff laterally and only adjusts tracking.
Toe is how much "bend" there is axle tubes. 0.6* toe/camber (depending upon the plane the bend is on) is considered factory tolerence according to published accounts from GM repair manuals. I'd actually like to see it myself, but ... The "bending" occurs during heating and cooling of the tube when the spring perch and LCAs brackets are welded in place.
PHB stabilizes the rear diff laterally and only adjusts tracking.
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There may be other ways, but it worked well for me. I then took it in for a front end alignment, since I also did front end work, and it was dead on center based on the rack with this method. Seems a little more accurate than a string and nut that can move around I think.
As they say, they're more than one way to skin a cat. I'm sure others will have ideas too. I like Mitchntx's idea. I would have never thought of that.
. If you have any other questions feel free to ask.Thanks
Brad
Well, that's what you get for living in PA ... 
I never liked the plum-bob method because I never had a warm, fuzzy feeling that the body panels have that close of a tolerence to be measuring wheel track off of.
When you are measuring to a 1/16" and the factory tolerence for body panels is +/- 1/4", what have you gained?
I never liked the plum-bob method because I never had a warm, fuzzy feeling that the body panels have that close of a tolerence to be measuring wheel track off of.
When you are measuring to a 1/16" and the factory tolerence for body panels is +/- 1/4", what have you gained?
(i have a stone driveway) 
On The Tree
Joined: Mar 2003
Posts: 115
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From: Suffolk, VA
Well, that's what you get for living in PA ...
I never liked the plum-bob method because I never had a warm, fuzzy feeling that the body panels have that close of a tolerence to be measuring wheel track off of.
When you are measuring to a 1/16" and the factory tolerence for body panels is +/- 1/4", what have you gained?
I never liked the plum-bob method because I never had a warm, fuzzy feeling that the body panels have that close of a tolerence to be measuring wheel track off of.
When you are measuring to a 1/16" and the factory tolerence for body panels is +/- 1/4", what have you gained?
Interesting ... I'm sure GM's requirement for individual panels are closer than 1/4" ... 10 thousands ... that's awefully close.
But you start putting together 6, 7 or 8 of the panels together and the tolerences begin stacking. And remember, we're talking about cars built in a plant with early 90's technology.
I do take issue with not worrying about tracking straight, though. Crabbing going down the hiway will cause excessive wear on the tires.
But you start putting together 6, 7 or 8 of the panels together and the tolerences begin stacking. And remember, we're talking about cars built in a plant with early 90's technology.
I do take issue with not worrying about tracking straight, though. Crabbing going down the hiway will cause excessive wear on the tires.
Thread Starter
Joined: Jul 2007
Posts: 2,861
Likes: 4
From: Ringoes/Flemington, New Jersey
I gotta get adjustable LCAs and relocation brackets... I just have non adj ones. I did not think ahead. I had no plans on lowering the car till i saw our cars on strano springs lol
