Truck Geometry - Levelling

BobbyP33 said:

Between the three variants you’ve had, which one had the best ride quality? Did you even notice a considerable difference in ride quality between the three (I’m assuming those were all perch collars)?


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Collars dont change the spring rate, they just change the static point of the suspension travel. There is a minor change because of the different arm angle, but nothing significant, so no change in ride on the front. The deavers in the rear are great though. Less wheel hop under acceleration, less sideways chatter in washboard sections, and they will take a bigger hit before bottoming out due to their progressive nature.

xrocket21 said:

Collars dont change the spring rate, they just change the static point of the suspension travel. There is a minor change because of the different arm angle, but nothing significant, so no change in ride on the front. The deavers in the rear are great though. Less wheel hop under acceleration, less sideways chatter in washboard sections, and they will take a bigger hit before bottoming out due to their progressive nature.

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I suppose a polyurethrane disc leveling kit would be similar to the collar?

500mag said:

I suppose a polyurethrane disc leveling kit would be similar to the collar?

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I have never heard of such a thing. Does it go on top of the strut?

xrocket21 said:

I have never heard of such a thing. Does it go on top of the strut?

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On top of the spring, actually. I had them on 2010 F150, 2014 F150, 2017 F250 and 2018 Raptor. Never had a problem with any of them, and they dampen vibration also.

500mag said:

On top of the spring, actually. I had them on 2010 F150, 2014 F150, 2017 F250 and 2018 Raptor. Never had a problem with any of them, and they dampen vibration also.

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What is the product and do you have a link to where you can purchase them.

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vazo said:

What is the product and do you have a link to where you can purchase them.

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There are several makes of them, Daystar is one. I'm not sure which one I have - I had Southern Off-Road Specialties in *******, GA install a 2.5 inch disc in front, a 1"block in back, mount 37 inch KM3s, and realign it. One of their employees had the same setup, and I liked the look of it. The expert there told me you could just go with a 2" disc and clear 37s though.

vazo said:

What is the product and do you have a link to where you can purchase them.

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You can browse them at 4wheelparts.com https://www.4wheelparts.com/b/suspension/coil-spring-spacer/_/N-cm5j2

The problem with spacers on top of the strut is they move the whole suspension cycle downwards, and some trucks CV joints and upper control arms will now see more angle when the suspension is fully extended...and fail....

what measurements are you guys getting from the ground to the inner fender flare?

I went to have my local mechanic raise my front end 1 inch, as my new fox factory shocks only gave me only 1 inch unfortunately, and he said he wouldn't do it as he felt it would compromise the CV joints because the angle is too steep. stock I was 40 inches and now I am 41. Whhat measurements are you guys seeing on your trucks?

SilverBolt said:

By raising the front you are transferring weight to the rear. Transferring weight to the rear will lower it. If you corner weigh the truck before and after raising the front you will see a change in the weight distribution.

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This. If you raised the front by lifting the truck exactly under the front axle, you won't change the load on the rear more than a tiny amount so long as the lift is small. By lifting off the front bumper, you are transferring weight to the rear axle and making it sink. This is the same principle as loading the bed. If you load the bed in front of the rear axle, the front takes some of the weight and the rear doesn't see the full load. If you load exactly over the rear axle, the front stays the same and the rear takes all of the load. If you load weight behind the rear axle you lighten the front and transfer it to the rear, so the rear axle actually sees more than the full load. If you want to understand it better, here are some keywords for a search. In physics they call this leverage. In mechanical engineering they call the analysis statics.

An accurate way to find what you're looking for is to put the front tires on blocks the same height as your proposed front lift and then measure the back. If you're only lifting 2", the change in the back should be less than your measurement error.