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Rear Wheel Alignment - Dually ??

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Old 04-06-2010, 12:10 PM
UaVaj UaVaj is offline
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Rear Wheel Alignment - Dually ??

My understanding is that: the dual rear wheels CANNOT be alignment. Only the front wheels are capable of alignment.

Can someone else "comfirm" this or "correct this?" Thanks.
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Old 04-06-2010, 12:31 PM
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Yes.

Unless there is a serious accident that bent the suspension components bad.
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Old 04-06-2010, 03:11 PM
UaVaj UaVaj is offline
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Quote:
Originally Posted by gearloose1 View Post
Unless there is a serious accident that bent the suspension components bad.
What do you mean? Please rephrase.
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Old 04-06-2010, 04:26 PM
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The rear suspension is not adjustable. So, if in a bad accident if the rear suspension is bent, you'd bend it back, or replace the bent parts. But it's not adjustable in the sense the front is adjustable.
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Old 04-06-2010, 04:43 PM
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Nothing there to align. Keep the wheels balanced and you are good to go.
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Old 04-06-2010, 05:10 PM
UaVaj UaVaj is offline
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For the record. A few stealership are charging for 4 wheel alignment (yep on a dually).

Just wanted to make double sure I get my facts straight before I go beating on their doors.
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Old 04-06-2010, 05:15 PM
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I even had a place tell me they would do an all wheel alignment on my LT-9000,I went somewhere else
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Old 04-06-2010, 05:38 PM
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Well...there is more than one type of alignment.

Front end is a 2 wheel alignment, with the rear not adjustable
Front and rear is a 4 wheel alignment, front and rear adjustable
Front with reference to the rear is a thrust angle alignment, front adjustable, but a rear-wheel drive vehicle

So, there sort of is a four wheel alignment for trucks. It's a thrust angle alignment that aligns the adjustable front relative to the non-adjustable rear, because the rear is the drive axle. It's more than a front wheel (2 wheel) alignment, but isn't quite a four wheel alignment. It's a two wheel with reference to the rear drive wheels.
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Old 04-06-2010, 05:51 PM
UaVaj UaVaj is offline
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Ace! You kinda lost me. Sorry for my lack of technical understanding.

For the front - (independent suspension). I understand there is (1) tow, (2) camber and (3) caster to adjust.
For the rear - (fixed axle). Are you saying that the rear tires/axle "CAN" be align/adjust to coincides/parallel with the front tires?

Can you or anyone link me a website with photos so I can visualized what/where is being adjusted on the rear axle.
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Old 04-06-2010, 06:54 PM
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No, and I'm sorry I brought it up. The rear aren't adjustable; however, there is an alignment relative to trucks that's not a two-wheel alignment.

On a rear wheel drive, like a truck (where the rear isn't adjustable) there is a thrust angle measurement (where the drive wheels point...which doesn't have to be EXACTLY straight, but should be darned close). What happens then is the front, which is adjustable, is made to point the direction the rear points (which may or may not be EXACTLY straight). So, really, on a truck like yours or mine they take a measurement of where your rear tires are pointing even though they aren't adjustable (or because they aren't adjustable, and because it's a rear wheel drive) and they then adjust the fronts to point the same direction/angle. Then, based on that they adjust for camber, caster, toe.

So, they aren't adjusting the rears to coincide with the front, they are adjusting the front to coincide with the rear (since you can't adjust them), then they are doing the normal two-wheel alignment stuff. It's a thrust angle alignment, or it's also known as a two-wheel alignment with rear wheel reference, or something similar to that. Sometimes places call it a four wheel, but it's not a four wheel...it's just a front wheel with rear reference, thrust angle, etc.

Sorry to confuse.
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Old 04-06-2010, 06:57 PM
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I hope this doesn't further confuse. I was just trying to point out the dealership might not have been trying to deceive, just maybe the terms used were getting confused.

http://www.tirerack.com/tires/tirete...e.jsp?techid=4

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