# dana 60 kingpin inclination, how many degrees??

Discussion in 'The Garage' started by 85-m1028, Nov 1, 2006.

1. ### 85-m10281/2 ton status

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Seems to me like I should know this but I can't seem to find the specs anywhere... I am trying to put together a few math formulas for setting up proper steering geometry along with a bunch of other steering and wheel combo related items..

I will be putting a thread up about cause and cure for the death wobble beacause I would like to try and condense all the threads I've gone through into something more timely!!!

2. ### Greg72"Might As Well..."Staff MemberSuper Moderator

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The original spec for 1-Ton trucks IIRC was something between 4 and 6 degrees of caster...... which is what I shimmed my D60 to get.

3. ### ARAMP1Aviator Extraordinaire

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The book (for a 1990 V3500) calls for +8 degrees.

4. ### 85-m10281/2 ton status

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Think of an imaginary line running from the top kingpin through the bottom kingpin and down to the ground... That angle as to how it relates to the flat or horizontal line of axle.
---------------------------------------- Not castor!! I know what that is!!

5. ### FOR MUD1/2 ton statusPremium MemberGMOTM Winner

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I read somewhere that Moog makes a adj king pin for the 60 , something like
4+ to 4- degrees.A couple of years back so I'm not sure.

6. ### 79k203503/4 ton status

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so camber then? it isnt adjustable. At least not from what ive seen...

7. ### atho1/2 ton status

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They still do. At least, its still available. You can get them at Carquest (who brands Moog products for their "blue" chassis parts line), but they are pricy. IIRC they replace the entire lower kingpin. I forget the pn#, but any counter guy worth his salt can look it up.

8. ### 4X4HIGH1 ton statusPremium MemberGMOTM Winner

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Camber can be adjusted by using tapered shims behind the spindle.

9. ### 79k203503/4 ton status

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Thats right i remember a pirate thread about that... i dont like the idea of doing that though. also unless your caster is 0* it will change as it turns...

10. ### 85-m10281/2 ton status

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The kingpin inclination is what causes "scrub" depending on your rim offset, Idealy you want the inclination "pivot point" to center in the contact path of the tire.
The fomula will take the kingpin inclination (degree of incline), distance from center of rim to the center inclination axis, and calculate the distance of where these two lines meet. This will ball park an optimal tire diameter.

11. ### ntsqd1/2 ton status

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That's what I was beginning to think you were after, King Pin Inclination Angle. Sometimes called Steering Axis Inclination Angle. Not normally considered a user adjustable angle, so I'd be surprised if it is listed anywhere. You're probably going to have to geometrically construct it from measuring a couple samples.

Camber is the top to bottom tilt of the Wheel Mounting Surface (WMS) which is NOT the same thing.

Sometimes scrub is a good thing. In a comp buggy or truggy it can help you in 'hunting' for traction by steering opposite locks. Large scrub causes the inside tire to be loaded harder than when pointed straight.

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