Zero rate add-a-leafs?

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May 7, 2019 | 12:46 PM

F0rdc0wb0y

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Fleet Mechanic

Joined: Jun 2015

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Zero rate add-a-leafs?

I run 315/75r16 toyo mt's on my leveled truck. They rub the drivers side fender well at full lock and almost rub the passenger side at full lock . I like how it currently sits and more importantly love how it rides. Don't want to lift it anymore....been down that road. The rubbing gets worse when I run my front mud flaps. Having the mudflaps is a must. Already repainted the drivers door due to rock damage. A member here told me about these zero rate add a leafs that move the front axle anywhere from an 1"-1.5" forward and eliminate any rubbing issues one might have. I've done some research and found where some have used it on their super duty with success.

https://www.offroaddesign.com/catalog/Zero%20Rates.htm

Has anyone else on here run these or have any experience with them? What kind of suspension or steering geometry nightmares am I going to cause by bringing the axle forward? I'm thinking the front driveshaft might need to be lengthened.

May 7, 2019 | 05:46 PM

Eaglescout94

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Joined: Feb 2014

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From: Springfield

I had them recommended to me as well and did a little looking into it. They shouldn’t cause any suspension issues seeing as they just move the axle, steering I’d imagine the steering link going from the box to the tie rod, I’m drawing a blank on what its all called or I’d be more specific. I’d have to look at mine or you could look at yours but i think there is room for the angle to change the little it will when the axle goes forward.

Dec 12, 2019 | 05:42 PM

F0rdc0wb0y

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Fleet Mechanic

Joined: Jun 2015

Posts: 1,633

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I had someone message me about the zero rates so I thought I'd update this thread. A buddy and I installed these back in june and I've put about 3,500 miles on the truck since then. These add a leaves allow you to space the axle out either 1" OR 1.5". I chose to move it forward an 1". Install was pretty straight forward. My ride height stayed the same as I removed several leaves from my already existing multi leaf leveling kit. The ride quality didn't change either. Rides very well IMO. With the axle being moved forward I can run some very beefy mudflaps on the front and I get zero rub on the flaps or fender from lock to lock and that's with 315's. I'm really pleased with these things.

Something worth mentioning should others try these out is that your are going to need to purchase new centering pins /bolts and drill the holes (depending on which you choose to use) a little larger. The pins and bolts provided are 3/8". Super duty springs will require a 7/16" centering pin and a 7/16" bolt to attach the zero rate to the existing spring pack. The length of the bolt you purchase (to attach the zero rate to the existing leaf pack) will be dictated by the thickness of your current leaf pack configuration. The centering pin length doesn't matter as you will be cutting the excess thread off below flush of the zero rate. Make sure you use a fine threaded bolt. Not coarse. I ended up with (grade 8) 7/16x20 threaded bolts. Then drill the hole(s) in the zero rate out to 7/16" and your good to go.