Caster on a SFA truck. - Ranger-Forums - The Ultimate Ford Ranger Resource


Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 08-16-2007
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Caster on a SFA truck.

The following was taken from a few different threads. I am trying to make sense of what is right and what is wrong.

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Originally Posted by zainyD
What I would do is this; narrow the axle, but leave the inner knuckles off. Get your front suspension set up how you like it and slide the axle under the Zuk. Once you get your pinion angle set put the inner knuckles on and set the caster. Depending on what tire size you want to run I would set the caster between 3-7*. I am running about 5.5* of caster with 35's and it's just about right. I could have a bit less and it wouldn't hurt me. You'll want to set your camber for 0* or maybe just a tiny bit positive.

Quote:
Originally Posted by zainyD
Ya, that would probably be OK. If it was me I'd set it between 5-7*. How much street time is this going to have.

Quote:
Originally Posted by redranger4.0
IIRC positive caster is the upper BJ ahead of the lower BJ, negative caster is what you want

I need to figure out how much caster I need on my D44. My Plan is once i get the pinion angle and the caster figured out then I can figure out where my upper and lower mounts go along with the coil mounts.

I hear a Jeep has about 4* positive caster. But then Andrew above says I need negative caster. ZainyD seems like he is saying I need positive caster.

Found this picture on wiki and seems like i would want positive caster??

Last edited by zabeard; 08-26-2008 at 10:44 AM.
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Old 08-16-2007
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Yes Positive Caster is what you'll want (upper ball joint trailing the lower). Positive caster is what causes your steering to return to center if you let go of the wheel from a turn, but may make for slightly stiffer steering. Neg caster tends to stay where you leave it, but makes for less effort to turn the wheels (upper ball joint leading the lower). If the caster is off from side to side it can cause a pull but does not wear the tires like camber does. When I use to do alignments I always used caster to off set for road crown.
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Old 08-16-2007
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Quote:
Originally Posted by Rev
Yes Positive Caster is what you'll want (upper ball joint trailing the lower). Positive caster is what causes your steering to return to center if you let go of the wheel from a turn, but may make for slightly stiffer steering. Neg caster tends to stay where you leave it, but makes for less effort to turn the wheels (upper ball joint leading the lower). If the caster is off from side to side it can cause a pull but does not wear the tires like camber does. When I use to do alignments I always used caster to off set for road crown.

so you make the caster a bit different for the crown on the road?
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Old 08-16-2007
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anyone else?
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Old 08-16-2007
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well i changed mine to +2.5*

Drives much better. Might change it more but i really did not want to over do it.
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Old 08-16-2007
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stock rangers are around 3-4 degrees.
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Old 08-17-2007
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My Ranger has about 6* of caster currently and it drives well. I could probably go with a bit less though.
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Old 08-17-2007
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thanks Deryck, I think I am going to set my D44 up for 4* of caster. I need to check my pinion angle tho, might have to grind the Cs off.
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