MORE caster numbers

Joined
Jul 1, 2007
Messages
465
Location
Southwest Virginia
Needed to have the alignment checked on my '93 after replacing the tie rod with a BudBuilt unit and thought i would post some numbers with my mods.

First, the numbers after installing the lift (OME "J" springs and OME bushings) and ARB Bull Bar.
Caster
Left : 0.2
Right: 0.1

Now, the springs have settled and I have added an 8000 lb winch, sliders with side protection, and a HEAVY rear bumper/spare tire carrier with a 35" spare.
Left: 0.9
Right: 0.8

BTW, the hub to fender (no flares) measurement is 23" front, and 25" rear.

I know I am not in "spec" but the truck rides and drives fine, no problems with quick maneuvers.

I would like to add a spacer up front to level it out. Anyone know how much caster changes per inch of lift?
FZJ80 046 (Medium) (2).jpg
 
Joined
Oct 21, 2005
Messages
1,284
Location
Washington, MO
Now, the springs have settled and I have added an 8000 lb winch, sliders with side protection, and a HEAVY rear bumper/spare tire carrier with a 35" spare.
Left: 0.9
Right: 0.8


I would like to add a spacer up front to level it out. Anyone know how much caster changes per inch of lift?

+0.8,+0.9 is where I am with the ARB, Winch, and 850 OME's up front. Med OME rear. OEM rear bumper. Cargo are packed with Misc Stuff, including the 35" toyo spare.
 

landtank

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Mar 27, 2003
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Groveland MA
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caster changes about 1.74* per inch of change.

The equation I use to calculate need is:

(Hub/flare in Inches - 20.5) x 1.74.

So as the truck sits now that would be

(23 - 20.5) x 1.74 = 4.35

Since OME = 3* if you were to add another 1.35* (4.35 - OME) then you would be at 2.25* which is within spec.

It's not exact but in my opinion close enough since we only have so many options as far as caster choices to use.
 
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