4link related, upper link chassis mounts For the four link upper links, mounting to the chassis.... How tall should the brackets be. Meaning, if i have the lowest hole of the mount at say 0 degrees for the sake of visualixztion, how far should the upper most hole be for maximum angle adjustment? Afco sells ready made brackets with 5 holes that are 7" tall. Thry also have 6 hole at 9". Would these work well for the upper link mounts and thus determining upper link angle or should i make something? https://www.rallyanarchy.com/phorum/read.php?5,102739,102739#msg-102739 Wed, 08 Apr 2026 04:27:51 -0500 Phorum 5.2.15a https://www.rallyanarchy.com/phorum/read.php?5,102739,102862#msg-102862 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102862#msg-102862
My 3-link has lower links 19.5" long and the upper is 14" and I don't know what the height difference is, I just kept making it lower and lower and grip kept going up and up, and I can't go any lower for space reasons. Pinion angle definitely changes over the course of suspension travel.

Stock RX-7 4-links have the upper links pretty short and the axle and body flex in order to allow it to work, and if you unbolt one link and articulate the axle, you'll see a 2"+ discrepancy between the body and the link. No wonder the upper mounts tear off of the car, or the rearends twist and flex and take a permanent set.]]> Pete Construction Zone Tue, 25 Nov 2014 20:04:13 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102858#msg-102858 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102858#msg-102858


That's 10" of travel with minimal pinion change. I would have gone with longer lower arms, but stuck with stock when I built it. The factory top arms where something like 9 or 9.5 inches long, to accommodate having the back seat in a sporty car.

-Jon]]> jrally Construction Zone Tue, 25 Nov 2014 16:34:12 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102818#msg-102818 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102818#msg-102818
What is more fun, every setup I have seen used clevises as the pivot instead of a rod end. Rod ends are not as strong as a clevis, so a clevis is used and you just use a Nyloc style nut on the bolt so you don't have to tighten it. The suspension rotates around the bolt.

Drag racing is often an amazing example of what you can get away with.]]> Pete Construction Zone Sat, 22 Nov 2014 16:13:02 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102816#msg-102816 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102816#msg-102816


As long as both wheels are moving up and down the same (i.e. no body roll or bumpy/uneven surface) it doesn't really matter.
So you are likely to see it on drag racing cars, where that doesn't matter a lot, and often due to regulations stating that the floor pan must be stock => not giving room for longer upper arms.

Since gravel rallying is all about articulation, roll and uneven surfaces, equal length should be the thing.]]> wildert Construction Zone Sat, 22 Nov 2014 14:55:31 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102814#msg-102814 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102814#msg-102814

http://www.how-to-build-hotrods.com/parallel-4-link.html

http://www.how-to-build-hotrods.com/triangulated-4-link.html]]> tdrrally Construction Zone Sat, 22 Nov 2014 14:37:53 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102812#msg-102812 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102812#msg-102812 Pete Construction Zone Sat, 22 Nov 2014 14:10:28 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102808#msg-102808 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102808#msg-102808
Quote
Pete
I tried equal length/parallel on the 3 link and suffered righteous wheelhop.

I'm curious by what you mean with the 70%/80% business, though.

I think he means upper link 70% length of the lower .
That way it will end up tracing a different arc than the lower..
Same thing is accomplished moving the upper front link down..
I guess.]]> john vanlandingham Construction Zone Sat, 22 Nov 2014 12:11:38 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102806#msg-102806 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102806#msg-102806
I'm curious by what you mean with the 70%/80% business, though.]]> Pete Construction Zone Sat, 22 Nov 2014 11:52:31 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102774#msg-102774 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102774#msg-102774
-Jon]]> jrally Construction Zone Fri, 21 Nov 2014 09:32:13 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102742#msg-102742 Re: 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102742#msg-102742 Gravity Fed Construction Zone Wed, 19 Nov 2014 16:33:03 -0600 https://www.rallyanarchy.com/phorum/read.php?5,102739,102739#msg-102739 4link related, upper link chassis mounts https://www.rallyanarchy.com/phorum/read.php?5,102739,102739#msg-102739
How tall should the brackets be. Meaning, if i have the lowest hole of the mount at say 0 degrees for the sake of visualixztion, how far should the upper most hole be for maximum angle adjustment? Afco sells ready made brackets with 5 holes that are 7" tall. Thry also have 6 hole at 9". Would these work well for the upper link mounts and thus determining upper link angle or should i make something?]]> Gravity Fed Construction Zone Wed, 19 Nov 2014 13:04:03 -0600