Coilovers on a MII IFS 54 Ford F-100 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-12-2010, 11:34 PM
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Coilovers on a MII IFS 54 Ford F-100

Guy's I just bought the truck and it rode too low in the front for my liking. I've raised it with tires and replacement springs and now it's too high and slightly uneven from side to side by about an 1/8 inch, I only went up one size spring according to Eaton's spring chart. After many suggestions I'm looking to swap in some coil overs to dial her in once and for all, but I'm concerned about placing the entire load on the stock shock mounting points. Will they hold up to the load?

-Will

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Old 01-13-2010, 09:20 AM
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If you just put new coil springs in you need to drive it for at least 500 miles so the springs can seat themselves. Coils will loose some of their initial height over the first few hundred miles and your truck will sit a little lower after that happens. Also a difference of 1/8" from side to side can't be seen by just looking at it. I don't think you'll ever find coil springs that will sit any closer than that. Another option, after the springs seat, would be to cut a portion of one coil (cut it with a saw not a torch) if it still sits a touch too high. You could also go back to the smaller tires that were on it when you bought it.

Coilovers are fine but I think you would be wasting your money.

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Old 01-13-2010, 10:36 AM
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Centerline I'm old and fairly blind but I could see the driver side was higher right away and we confirmed it with measurements from the ground to the fender lip on a flat and level concrete pad. Going back to the low profile tires would only make it worse i.e. the gap between the tire and fender would grow and the chassis would be closer to the ground. I've only driven it about twenty miles but I think the odds of it settling exactly an inch on the passenger side and an inch and a eighth on the driver side are pretty remote hence the coilover idea. Believe me I'm not in a hurry to spend the money on the coilovers but I want the stance close to perfect while minimizing the trial and error phase. I still would like to know if the stock shock mounting points are up to the load, more pointedly the lower horizontal bolt through the OEM lower control arm? Also considering I'm only after an 1/8 side to side is it acceptable to grind that amount off the lower end of the coil spring or would that create too much heat?

-Will
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Old 01-13-2010, 10:54 AM
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Just send the coil springs back. Tell Eaton that you want a matched set of springs 1/8 inch shorter.

Let us know how that works out.


454 RATTLER
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Old 01-13-2010, 11:53 AM
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Measure the installed height of the springs that are in the truck now. With that info and knowing the rate of the springs you can determine how much weight the springs are supporting.

With that info, contact your spring supplier and tell them you need springs to support "X" amount of weight at what ever height you like. Example: if the springs have a current installed height of 11" and are supporting 400lbs, if you want to lower the truck 1", let the spring shop know you need to support 400lbs at 10" installed height. Keep the uninstalled (free) height the same so the springs won't be loose at full suspension droop. You can make up for any minor differences in height with a small shim or by slightly trimming the spring from the high side.

As to the shock mounts being strong enough, I feel all coil-over mounts should be double shear.

Andy
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Old 01-13-2010, 03:40 PM
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Alright I'm going to remove the high one and grind to match sides and drive it for a few hundred miles to see how they settle.

-Will
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Old 01-13-2010, 04:26 PM
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Sounds like a good plan, just keep in mind with the leverage ratio of your suspension, to lower the truck 1/8" at the wheel will require next to nothing being removed at the spring. All spring height changes are amplified at the wheel.

Andy
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Old 01-13-2010, 07:37 PM
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yeah that's why I figured grinding vice cutting.

-Will
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Old 01-13-2010, 09:39 PM
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Have you measured body height all 4 corners? If the rear is off, it may be unevenly loading the front end...

Russ
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