measuring caster - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 08-15-2013, 12:27 PM Thread Starter
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measuring caster

so ill start by saying im no suspension expert. ive been reading up lately about how to get these trucks to handle better and one common theme is caster. most say that 4-5 degrees is where you want it. is there a way to measure at home thats accurate? i used the bump stop pads on the axle to take my measurement. if im doing it right im at like 12 degrees negative. also my front springs are not straight up and down, they bow away from the shocks (toward front of vehicle. so if this is right then i think i have pinpointed why im having some steering issues. or maybe im doing it wrong and the pad is at an angle to begin with.
so question is how can you measure caster at home. lift is a n icon 7" with 1" spacer under spring. all supporting equipment that came with the icon kit is installed. thanks

06 f350: 8" ICON 2.5 resi's, ouo ala's, pmf track bar, dual stabilizers, custom 5" exhaust, 37" BFG km2's, 4.30s, 08 tailgate w/step, 08 tail lights, coolant filter, BPB oil cooler w/p 58v ficm and radiator, ARPs, 175cc, MTW s1 billet, ported intake, egr delete, onboard air and gearhead tunes
All the above just to haul the 900hp street mustang
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post #2 of 15 Old 08-15-2013, 01:22 PM
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Would love to know as well to try and check out my truck. Hope someone can give you the answer. I am tired of the bump steer lol
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post #3 of 15 Old 08-16-2013, 10:23 AM Thread Starter
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all the talk about caster on this site and nobody knows how to measure?

06 f350: 8" ICON 2.5 resi's, ouo ala's, pmf track bar, dual stabilizers, custom 5" exhaust, 37" BFG km2's, 4.30s, 08 tailgate w/step, 08 tail lights, coolant filter, BPB oil cooler w/p 58v ficm and radiator, ARPs, 175cc, MTW s1 billet, ported intake, egr delete, onboard air and gearhead tunes
All the above just to haul the 900hp street mustang
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post #4 of 15 Old 08-16-2013, 10:26 AM
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You could probably use an Iphone app and stick it on your front cover of your diff...

2001 - 14" OUO 525 - 38x15.5x20 Toyo & 20x12 Weld Cheyenne's. Hybrids, 38R, BTS, Spearco, Terminators..



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Originally Posted by Mannysouza View Post
You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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post #5 of 15 Old 08-16-2013, 10:31 AM
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Another reason I am a big fan of the OUO ALA arms. They will get your caster in check! Plus they will keep your steering in check as well since your steering on your axle is designed around a radius arm setup. I know they are expensive, but you get what you pay for in this industry.

2001 - 14" OUO 525 - 38x15.5x20 Toyo & 20x12 Weld Cheyenne's. Hybrids, 38R, BTS, Spearco, Terminators..



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Originally Posted by Mannysouza View Post
You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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post #6 of 15 Old 08-16-2013, 01:38 PM Thread Starter
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Quote:
Originally Posted by layson View Post
You could probably use an Iphone app and stick it on your front cover of your diff...
So your saying I can measure from the top of the diff? I already have a tool to measure the degree of the angle

06 f350: 8" ICON 2.5 resi's, ouo ala's, pmf track bar, dual stabilizers, custom 5" exhaust, 37" BFG km2's, 4.30s, 08 tailgate w/step, 08 tail lights, coolant filter, BPB oil cooler w/p 58v ficm and radiator, ARPs, 175cc, MTW s1 billet, ported intake, egr delete, onboard air and gearhead tunes
All the above just to haul the 900hp street mustang
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post #7 of 15 Old 08-16-2013, 02:13 PM
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On the front face, my cover is flat so it is easy for me.

2001 - 14" OUO 525 - 38x15.5x20 Toyo & 20x12 Weld Cheyenne's. Hybrids, 38R, BTS, Spearco, Terminators..



Quote of the Day:
Quote:
Originally Posted by Mannysouza View Post
You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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post #8 of 15 Old 08-17-2013, 06:55 AM
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Quote:
Originally Posted by 94slowbra View Post
So your saying I can measure from the top of the diff? I already have a tool to measure the degree of the angle
Quote:
Originally Posted by layson View Post
On the front face, my cover is flat so it is easy for me.
There are caster bushings in the axle ends that, IMO, would make this inaccurate if you don't not have a control to measure against. As in, you went to a shop, got accurate numbers and used those as your control for future adjustments.

Speaking of those caster bushings/shims/whatever, have you tried moving those?

**EDIT** For some reason, I thought that you had an 2003/2004. therefore anything else I had added previously was irrelevant. Sorry about that.

Anyway, now that I am on the right page, some form of lowering on the trailing arms (at the frame end) would help correct this caster issue. If it's not feasible to lower the trailing arms at this point, remove the spacers, that will defintely roll the axle back to where it needs to be. Pushing the axle down and not moving the trailing arms in a matching motion is how the caster gets all jacked up on coiled up trucks.

Karl and his 2003 6.0

Barefoot Accelerator Pedal
TRICO Force wiper blades
Yellow Military Aircraft Valve Stem Caps
Offensive "Stick Family" Decal
Big Ol'Honkin 1 1/4" Shank Receiver Hitch


WHAT!?! I was trying to list stuff that everyone else
hasn't already listed for their truck!





Last edited by Karls03; 08-17-2013 at 07:49 AM.
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post #9 of 15 Old 08-17-2013, 07:02 AM
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Quote:
Originally Posted by 94slowbra View Post
all the talk about caster on this site and nobody knows how to measure?
Almost forgot, I've got some old skool alignment tools that I would use if I had any questions about my steering settings. I'd probably have to remove the hubs because they are magnetic. Although, that heavy truck may squash the plates that are used to input 20* of steering to read the caster. Improvise, adapt, and overcome.

Karl and his 2003 6.0

Barefoot Accelerator Pedal
TRICO Force wiper blades
Yellow Military Aircraft Valve Stem Caps
Offensive "Stick Family" Decal
Big Ol'Honkin 1 1/4" Shank Receiver Hitch


WHAT!?! I was trying to list stuff that everyone else
hasn't already listed for their truck!




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post #10 of 15 Old 08-17-2013, 07:38 AM
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Did you ever get the 3 links ? I know when I first put mine on my springs were arched like yours but once I got the adjustments right the springs ended up being straight with no more arch in them and my castor was able to set at 4.5R and 4.0L and truck handles great. If you still have the radius arm drop set up you need to look at a 3 or 4 link to fix the axle roll issue and allow caster adjustment.

I know when I did the TEI spacer on my 4.5" kit my springs arched a little after the install and knowing what I know now I wish I would of done a 3link arm or 4 link set up as that would of fix that back then.



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