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Old 06-19-2006, 08:29 PM
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Anyone use a 3 link rear suspension?

I am planning to use a 3 point rear suspension for my 28 rpu. I plan to attach the two lower trailing arms to pivot points on the rearend just like a typical 4 bar system. Instead of the 2 bars at the top I plan to use a single bar mounted at the top center of the housing and then to a crossmember on the frame. The upper bar will be in parallel to the two lower. Of course I plan to install a panhard rod. Spring will be coils.

ANyone else using this setup could tell me how it rides or any cons to this design?

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Old 06-20-2006, 09:57 AM
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This is similar to the 2005 Mustang rear suspension. It was also used by Jaguar on the early C-Type, but with the upper link offset to the right to cancel driveshaft torque. This version was also used in the very successful C/A first campaigned by the Ramchargers.

By placing the upper link and lower links parallel (in side view), you will cause the car to squat excessively on launch. Or, were you talking plan view?

I'd suggest that you take a look at the last two pages at my blog:

http://home.earthlink.net/~whshope
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Old 06-20-2006, 12:10 PM
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I never expected it to be so complicated. I'm still reading your site. I'll have to read it a few time to fully appreciate it.

I don't plan on racing the truck. I just assumed that the upper and lower should be parallel based on all the pictures I had seen.

Another question. Can the lower bars mount above the axle or what ill effects would this cause?
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Old 06-20-2006, 02:04 PM
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Quote:
Originally Posted by FrankR
Can the lower bars mount above the axle or what ill effects would this cause?
I'm not sure I'm following you. Are you talking about putting the symmetrical pair above the axle and the 3rd link below? If so, there's nothing wrong with that EXCEPT that the single lower link would be carrying a very large load, on launch, all by its lonesome and you don't want to skimp on wall thickness.

If you're talking about moving all 3 rear locations upward, again, there's nothing wrong with that. Actually, the position of the axle housing isn't all that important. (For fabrication ease, however, I'd think you'd want to use the upper and lower surfaces of the axle housing to mount your brackets.) What's important is that the instant center is where you want it and the link angles and positions don't generate any weird torques on the axle assembly. I hope that I've covered everything adequately at my blog, so just keep reading. If you have any questions, just PM me and I'll try to answer them.
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