C_Rules

iTrader: (7)

I have an aftermarket phb but it is not adjustable. would a 4 wheel alignment take care of centering the rear end if it is off?

_JB_

iTrader: (33)

Nope, you need an adjustable PHB to move the rearend.

KILLER-LS1

iTrader: (18)

a TRUE 4 wheel alignment is for corvettes with IRS. although sensors are placed on all 4 wheels on our cars, only the fronts are adjusted..

kny3twalker

iTrader: (31)

I had my rear aligned, the shop adjusted the panhard bar and lower control arms

C_Rules

iTrader: (7)

thanks guys. how did you go by measuring to see if your rear was misaligned?

C_Rules

iTrader: (7)

anybody?

kny3twalker

iTrader: (31)

it was obviously crocked when I put my 12 bolt in
you could tell from the gap on the passenger side

BeemerZ28

iTrader: (5)

like JB said unless you have adjustable panhard bar then there is no way to center your rear if its off. Its called your thrust angle and can make the car push to one side or the other and should be set(if possible) before aligning the front suspension.

C_Rules

iTrader: (7)

thanks for the replies. my axle doesn't appear to be off by just looking at it. i need to know how do you measure it to find out if it's off. all you guys with adj phb's how did you know when your rear was centered after adjusting?

IA2000SS

With the vehicle on the ground measure the distance from each rear wheel to fender well, this will determine which way the axle needs to be moved.

leadfoot4

iTrader: (1)

Get either a plumb bob, or a piece of fishing line with 2-3 hex nuts tied to one end as a weight. With a piece of masking tape, set the line down the rear fender, right at the center of the wheel. Measure the distance from the line to the center of the wheel. Record the number. Repeat on the other side. Adjust the panhard bar until the numbers are equal on both sides.

chupr0kabra

iTrader: (10)

What I did:

1. Wet the street in front of your house, enough to make a wet area, but not so much that it makes a huge puddle.
2. Drive STRAIGHT through the wet area.
3. Quickly (before they dry) look at the tread patterns your tires leave.
4. If the treads from the front and rear tires don't match, figure out how far off (and which direction) they are by measuring.
5. Jack up car/adjust panhard bar.
6. Repeat 1-4 until the tread patterns line up.

I chose this method over the "measure from the fenders" method because I don't trust that the body tolerances are correct. This way, you KNOW the front and rear tires track true.


-Mike

99Bluz28

iTrader: (35)

I use the Eye and finger guage.