3 link help

[Welderd]

ok the 3-link on my buggy's rear isn't working out so well and i can't figure it out.


It's a typical moon buggy rear end and the suspension is pretty well copied from a campbell chassis

here's some pics

campbell's rear

my rear

you can see the rear links here

I have plenty of adjustment of the rear pinion angle thru the top link.
the top link is slightly angled in above the pinion, like campbells design.
Upper and lower links are the same length

Here's what's going on:

It works great in every situation except full stuffing the passenger side(diff side) and fully extending the driverside.
When this happens the pinion is rotated up and points directly at the upper link!!! Won't work at all.

What's happening is it's pivoting around the tall panhard mount and the lower link, being further from the point of rotation moves further outward and therefore is gettting shorter than the upper link and rototing the pinion up.

I can make it work by adjusting the pinion down in this situation but it ends up too low in a normal situation.

I'm not seeing how to fix this and from looking at other similar designs I don't know how they aren't having similar problems especially since I have a low pinion and all thiers are flipped?????

 

[LUNCH]

youve gotta change the angle in your link from the rear end to your frame

 

[Welderd]

wow that's insightful

Jk, finally some advice

that's at full stuff (6"), and that upper link has got about 6 holes to choose from

Cutting it all apart this weekend to test my theory out. I think the panhard is just too high for the narrow axle

 

[Juan_Hong_Loe]

Just curious, why did they mount the lowers on top of the axle tube? Seems to me that would be a problem. dunno

 

[blacksheep10]

hell no, that gets your roll center up and makes for more stability on sidehills. my lowers are almost always above the axle tube