Topic: 3 link upper placement

[jasonnorcal]

I'm shopping for three link kits and some give you the option for the upper link bracket to be on the diff housing or on the tube. Is it just a matter of where it fits? Or something else? I get why you'd put it on the center section if you had a D60 to keep the tubes from spinning, but what about a 8 or 9" axle? Does the track bar and steering box complicate things? For reference I'm talking about a pass drop 22re truck with crossover high steer and stock axles. Thanks in advance for edumacating me.

[a1gemmel]

Where the links go dictates the characteristics of the how the suspension performs - roll center, anti-squat/dive, instant center, pinion angle change, articulation steer, etc.  It's a whole can of worms that's above my paygrade to understand and explain. And, well, where the links actually fit in the chassis is a lot more constrained in trucks like ours than in purpose-built buggies.

This page explains it all well:
https://www.crawlpedia.com/4_link_suspension.htm

The 3 link calculator linked on that page is a good way to prototype out your particular arrangement.

[jasonnorcal [OP]]

Yeah I'm trying to grasp the whole concept myself. I understand how link placement and angles can effect things like roll center and anti dive all of that stuff, but I don't think where the upper link is placed would really affect that. Seems more like a space/packaging issue tied up with the drag link and panhard bar.  :dunno:Thanks for the link to the calculator

[Ritchie]

Which kit are you planning on using?

[jasonnorcal [OP]]

I was looking at the 4 wheel underground kit

[lone walker]

4wu is good but is stupid expensive now. If you have knowledge, built your own. Or buy just 4wu brackets and piece everything else separately?