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Old 11-27-2012, 08:00 PM
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pmf 3 link

I am looking at putting the pmf 3 link on my truck. What are the pros and cons? I have a 2.5" icon coil springs with stock radius arms and top gun custom adjustable track bar in front. Will the 3 link help with the ride of the truck?
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Old 11-27-2012, 08:08 PM
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Not really but it will let you dial in the proper amount of caster which is critical.
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Old 11-27-2012, 08:21 PM
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I don't have first hand experience with the 3 link, but from my research it is a lot more solid than a 4 link setup. It's really not for a better ride, it's for more articulation. Some of the 4 link kits have axel sway where the axel moves right and left which causes stability issues at speeds the 3 link remedies this.
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Old 11-28-2012, 02:15 AM
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It is the job of the track bar to prevent the axle moving back and forth. I have a long arm 4link from PMF on my truck and I assure you that my axle doesn't move around. It also doesn't by itself have anything to do with articulation. What it will do is let you set a proper caster of 5-5.5 degrees and maintain your pinion angle through the axle's range of motion. Articulation will depend on your spring and shock package.

The 3 link is just like a radius arm except that you can adjust the bottom front attachment points on the axle, and therefore change the caster. I looked at both the 3 link and the 4 link when I did my suspension and went with the 4link. Trevor built his prototype 4link for my truck.


Last edited by PGreenSVT; 11-28-2012 at 02:19 AM.
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Old 11-28-2012, 05:42 AM
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Quote:
Originally Posted by PGreenSVT View Post
It is the job of the track bar to prevent the axle moving back and forth. I have a long arm 4link from PMF on my truck and I assure you that my axle doesn't move around. It also doesn't by itself have anything to do with articulation. What it will do is let you set a proper caster of 5-5.5 degrees and maintain your pinion angle through the axle's range of motion. Articulation will depend on your spring and shock package.

The 3 link is just like a radius arm except that you can adjust the bottom front attachment points on the axle, and therefore change the caster. I looked at both the 3 link and the 4 link when I did my suspension and went with the 4link. Trevor built his prototype 4link for my truck.

What did the 4 link do to the handling of your truck?
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Old 11-28-2012, 06:46 AM
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My truck rides better than it did when it was stock. I don't have a rear sway bar on the truck so I don't have sports car like handling but it is very stable at all speeds and I've had it up to about 120. Hard to tell exactly with our speedo but it was well pegged.

I am not saying anything is wrong with the 3link and I like it better than a lot of the 4link kits on the market. If you consider a 4link and aren't a serious off-roader then a long arm setup has its advantages in maintaining steering geometry and pinion angle. I don't like any of the kits that bring both arms back to the point of the radius arm mount. The bars are not parallel and the geometry and pinion angle changes as they go through the axle range of motion. If you aren't ok with the long arm 4link go with the 3link. Either way you go Trevor makes awesome stuff and will modify it for your specific needs. Try getting one of the other companies to do that.
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Old 11-28-2012, 06:52 AM
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You have a very small lift. It might help, but more so if you had a larger lift or you were set up more for off-road use. As stated earlier, for a lifted vehicle you will need something for the angle and articulation. 3 vs 4, is really about the geometry of the amount of lift.

Quote:
Some of the 4 link kits have axle sway where the axle moves right and left which causes stability issues at speeds the 3 link remedies this.
The PMF kit is not a whole lot different that what was originally there to hold the axle from sliding left or right. Suspension and swaybar/sway stability are always a trade-off between off-road and highway driving. Too much suspension travel and sway at high speed can be a dangerous combination. There are kits to add stability for highway driving then, you simply remove them when you get to the trail. Some 4-links are more tiangulated or have a panhard bar.

Last edited by twoicebergs; 11-28-2012 at 07:06 AM. Reason: panhard
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Old 11-28-2012, 07:34 AM
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One thing I haven't heard anyone mention is that the 3 or 4 links will really help eliminate the front wheel hop that plagues coil spring trucks. If you drag or pull the truck it will make a huge difference.
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Old 11-28-2012, 08:06 AM
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But who uses it like a tractor or takes it to the track?
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Old 11-28-2012, 11:03 AM
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I would run the One Up Offroad ALA arms. They are 3-link/radius arms. The arms are offset which will provide you with a better turning radius than the stock arms or a 4-link. These also have better joints that will tighten up your steering and get rid of the factory wander, these joints are not going to be clunky or noisey. You can run this setup on a stock height truck all the way up to a 6-8" lift. One Up Offroad has been building these type of 3-link arms for 10 plus years.

I wouldn't go with a 4-link, stick with the 3-link/radius arm setup and you will have a great driving truck.

You won't have any front wheel hop issues. That all has to do with your air pressure, your tire selection, and your shocks.
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