What is optimum Castor setting? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 04-11-2010, 09:29 AM Thread Starter
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What is optimum Castor setting?

I need to take the truck in for an alignment. Its pulling slightly to the right. Not bad, but I know it shouldn't be pulling at all.

My questions are:

1) What is the target Castor setting? Lift specs are posted in my signature.

2) I really don't know much about adjustment on the ICON 4-link. Can I run the lower link bars out or in to add or subtract Castor?

3) Is there any way to measure it at home, or can it only be done at the alignment shop?

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post #2 of 13 Old 04-11-2010, 11:02 AM
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With your set-up I would go with 3.5 to 4 deg. You can go about 0.25 more on the passenger side than the driver side which will help fight that pull. Most roads naturally slope to the right for drainage.

1999 F250 4x4 with 2004 Cummins backed by a BTS transmission, '06 axles suspension, 4.5" lift, smoothed/painted frame, FASS 150/150, Hellmann Performance Fuel Sump, ARP head studs.
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Last edited by Aggie007; 04-11-2010 at 01:32 PM.
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post #3 of 13 Old 04-11-2010, 01:32 PM
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That is 3.5-4 deg postive caster...fixed above..I know Jesse tells most people to run 4-4.5* caster with the lift SD's. I would go 4* and see how it rides from there.

1999 F250 4x4 with 2004 Cummins backed by a BTS transmission, '06 axles suspension, 4.5" lift, smoothed/painted frame, FASS 150/150, Hellmann Performance Fuel Sump, ARP head studs.
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post #4 of 13 Old 04-11-2010, 02:28 PM Thread Starter
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Is there any way to check it myself? Or is that something that can only be checked at an alignment shop?

2005 F350 Crew Cab 4x4

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post #5 of 13 Old 04-12-2010, 07:39 AM
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The alignment shops have a magnetic tool that sits on the hub. You turn the wheel each way then it gives you the castor reading. I dont think that this is easy any other way.
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post #6 of 13 Old 04-12-2010, 08:07 AM
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I originally set my caster when I installed the OUO front links with a magnetic angle finder sitting on the flat spot in front of the upper ball joint. When I put my truck on an alignment rack I was .25* off. You just have to be sure the ground is level. that is by no means exact, but will give you a good idea.

1999 F250 4x4 with 2004 Cummins backed by a BTS transmission, '06 axles suspension, 4.5" lift, smoothed/painted frame, FASS 150/150, Hellmann Performance Fuel Sump, ARP head studs.
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post #7 of 13 Old 04-25-2010, 12:25 PM
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I run +3.5 to +3.7* of caster on my 07. Much better handling than stock.
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post #8 of 13 Old 04-25-2010, 07:28 PM
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Billy,
Take it to Robert at Lumberton. He's got an old guy that does nothing but alignments. Mine was pulling to the right too. He got an adjustable alignment cam and dialed it in. The thing is straight as an arrow now.

2011 SD F250 4X4 Crew Cab Lariat
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post #9 of 13 Old 04-25-2010, 07:31 PM Thread Starter
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I might take it by there. I wont need alignment cams, cause I have the ICON 4-link so it can be adjusted there.

2005 F350 Crew Cab 4x4

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20" Harley Wheels 305/55/20 Nitto Terra Grapplers
ARP Studs & EGR Delete from PowerStrokeMagic w/GearHead Tunes
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post #10 of 13 Old 04-25-2010, 07:41 PM
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crap i have no idea what my camber or castor is set at. trucks got 6 inch springs. 5 inch hanger in the front and 6 inches of blocks in the rear. anyone have an idea what i should be looking at as far as the castor/camber?
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