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F100 ride height

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Blairsville Ed
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F100 ride height

Post #1 by Blairsville Ed » Sat Jun 06, 2020 3:25 pm

1968 F100 2wd 240

Ride height:
I installed a pair of Moog variable springs About 6 months ago, which lifted the front end about 1 inch.
Camber is 2-1/4 degrees positive.
What should the ride height be and where is it measured?
I measured the distance from the frame to the I-beam at 4-3/4”
For checking camber that measurement should be 4.000
Cutting a little off the top of the spring appears to be the only way to bring the height down which would also reduce camber.
Moog variable rate spring cc808 fits every truck from 1965 to 1977 no matter which engine you have. Maybe my 240 is not heavy enough to compress the spring.
Anyone else have this issue?

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bubba22349
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Re: F100 ride height

Post #2 by bubba22349 » Sat Jun 06, 2020 4:59 pm

Hi Ed, the ride height for both a F100 & F250 two wheel drive pickup is with the chassis resting on a 4 inch block placed between the frame and both front axels. In addition ride height is also determined by having all 4 of the wheels and tires the same size and with the frame setting level front to rear. Since you have 4 3/4 inch height between frame an the front axle now you will need to add some weight the the front end the truck (couple of sand bags or cinder blocks etc.) to bring it down to rest on those blocks to be able to determine the measurements. After the correct alignement settings is right the height difference won't matter as much but with the front setting high you might want to use the F100 4 X 4 alignement specs. These trucks also handle better if the front is noise down some rather than higher. You can make some adjustments If the frame height isn't level front to rear measure the frame with an angle meter to get the frame angle. Then if the front end sets lower than the rear end height add the frame angle to the caster angle for the correct setting. If the front end sets higher than the rear end subtract the frame angle from the caster angle.

When doing the toe in setting the steering box also needs to be on its high center point, when truck moves in straight line going forward mark the steering wheel with a chock mark and on a corresponding one on the dash this is the steering boxes high point this needs to be right. Both your front spring heights should be close to same height and the Front Tire circumference in center of each tire needs to be within 1/8 inch too.

The optimal caster on these Twin I Beam Ford trucks is + 4 degrees positive. I try to get both side as close to the same as possable or within .25 degree Ford says no more than 1 degree. 4 degrees is the optimum King Pin inclination angle. Optimal setting for Camber is + 1 degree positive, with a 1/8 inch for the perfered toe in setting. Good luck :thumbup: :nod: Edited
A bad day Drag Racing is still better than a good day at work!

I am hunting for a cheap project car to build up. My Ex-Fleet of Sixes sadly these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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wallen7
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Re: F100 ride height

Post #3 by wallen7 » Sat Jun 06, 2020 5:14 pm

What he said less on the left because of the crown on the road. Less on left will pull to left and crown on road will help because it will be uphill slightly.

Blairsville Ed
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Location: North Georgia

Re: F100 ride height

Post #4 by Blairsville Ed » Sun Jun 07, 2020 9:06 am

I seen the Ford manual instructions concerning the 4 inch blocks. I have also been reading that Ford Originally had several front coil springs available. I guess that’s how they leveled the trucks, a heavier engine got stiffer coils. Current after market springs are very limited.
If I measure the distance from the ground up to the fenders, the front is currently higher than the back. So, my thinking is to trim the coil springs to level the truck or maybe have the back end a little higher. This would bring the camber specs a little closer to being correct.
I guess the ride height is whatever you want it to be.

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bubba22349
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Re: F100 ride height

Post #5 by bubba22349 » Sun Jun 07, 2020 10:55 am

It's a very simple suspention system if the front springs are new you might want to wait a few miles like 500 to 1000 as the springs will settle some. The front axle rating is 2600 lbs and when the pickup trucks were new with all the same size wheels and tires the rear sat up just a little bit so when they were loaded with half the max recommended payload weight the frame settled down to being level and still had decent handling. Yes having the rear setting up a little higher would be better. How does your truck set with the trailer tough load on it? Perfection would be be with the truck frame level as well as the trailers tung weight on the hitch setting sliaightly nose down. :nod: Edited
A bad day Drag Racing is still better than a good day at work!

I am hunting for a cheap project car to build up. My Ex-Fleet of Sixes sadly these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

Blairsville Ed
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Posts: 260
Joined: Sat Apr 22, 2017 3:39 pm
Location: North Georgia

Re: F100 ride height

Post #6 by Blairsville Ed » Mon Jun 08, 2020 5:41 pm

I’ve had the springs on for about 1000 miles.
Today I did some spring cutting. I got the Frame to I beam distance to 4 inches which settled the camber in to 1 degree positive on the drivers side and 1.25 degrees positive on the drivers side.
I was amazed. Just by correcting the height the camber aligned.

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bubba22349
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Re: F100 ride height

Post #7 by bubba22349 » Mon Jun 08, 2020 6:46 pm

:beer: Great job Congrats, that puts the Camber right in the sweet spot! How are all your other alignment settings now?:thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am hunting for a cheap project car to build up. My Ex-Fleet of Sixes sadly these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

Blairsville Ed
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Posts: 260
Joined: Sat Apr 22, 2017 3:39 pm
Location: North Georgia

Re: F100 ride height

Post #8 by Blairsville Ed » Mon Jun 08, 2020 8:31 pm

I’ll do a caster measurement tomorrow. The truck now has a 1 degree rise towards the back which I believe is to be added to the caster measurement.
I’ll check toe last.

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bubba22349
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Re: F100 ride height

Post #9 by bubba22349 » Mon Jun 08, 2020 8:45 pm

IN thinking about this some more it just occurred to me that normally on these F100's you have the jack up the frame a little higher to get the 4 inch blocks installed. I forget how much that was but it was at least a 1/4 inch because once you let the frame back down again the blocks were held in solidly. Maybe a little more cutting to bring the nose down a little more :nod:
A bad day Drag Racing is still better than a good day at work!

I am hunting for a cheap project car to build up. My Ex-Fleet of Sixes sadly these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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