Interpreting E Series Caster Spec
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Senior User
Joined: Nov 2014
Posts: 135
Likes: 7
From: 51.6N 114.7W
Interpreting E Series Caster Spec
Thinking outside the box ???
Given: 2011 E450 Caster Spec 3.90 +/-2.90 Degrees
This specifies a range of +1.0 to +6.8 Degrees
Logical Interpretation:
+1.00 Degrees for 100% city driving
+3.90 Degrees for 50% city and 50% highway
+6.80 Degrees for 100% highway driving
NOT +3.90 for all ???
Given: 2011 E450 Caster Spec 3.90 +/-2.90 Degrees
This specifies a range of +1.0 to +6.8 Degrees
Logical Interpretation:
+1.00 Degrees for 100% city driving
+3.90 Degrees for 50% city and 50% highway
+6.80 Degrees for 100% highway driving
NOT +3.90 for all ???
Elder User
Joined: Feb 2015
Posts: 699
Likes: 5
From: S. Illinois
Your calcs seem logical...I think the biggest issue, is what a shop is willing to do to attain the specs you want or just to get it with in specs.
Local shops around here only use drop in bushings so it's very limited as to what can be achieved.
Local shops around here only use drop in bushings so it's very limited as to what can be achieved.
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
I've found working only with "big truck" shops yields the best results, they're far more experienced and knowledgeable how to set alignment spec's to the customers desires. If you have a preference they're usually willing to give you just that. The small range of adjustment a "normal" bushing offers is acceptable because those bushings are avaiable to produce the full range of E-Series caster, toe and camber.
The chain tire stores set specs to what the alignment equipment accompanying charts says are for a vehicle, too often ignoring the customer's needs or wants. I personally haven't allowed a tire store to even touch my front suspension for the past 12 years or so.
The chain tire stores set specs to what the alignment equipment accompanying charts says are for a vehicle, too often ignoring the customer's needs or wants. I personally haven't allowed a tire store to even touch my front suspension for the past 12 years or so.
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