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Old 09-27-2008, 04:46 PM
Don Meyer's Avatar
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Must II IFS/Chevy AD truck

I am feeling a little better & am back working on my 48 GMC trk(1/2 ton).
I have a TCI Must II IFS installed w/350 lb/in springs. Now for the problem...
the trk has not started to compress the springs & all the weight is on them.

If I bounce up & down on the front end the springs do not move also the spindles are very hard to move like they are binding.
I thought I'd remove the springs & cut a 1/2 coil from them, but thought I'd ask you guys what your thoughts were.

Thanks Don
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Old 09-27-2008, 06:02 PM
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I would hesitate to cut on the springs. Why don't you call TCI and ask if they have a weaker spring? Keep in mind that new springs will "settle" to a length maybe 1/2 to 1" lower than when first installed.....takes a few hundert miles. Have you greased all of the Ball joints etc?
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Old 09-27-2008, 07:27 PM
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I am told that the lower a arms should be even with the bottom of the crossmember with the full weight of the vehicle.
As far as bouncing the vehicle, how much do you weigh?LOL
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Old 09-27-2008, 07:47 PM
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You can cut a coil, but I'll bet that with all the weight on now it won't help. I know that the springs that come with most all of those kits is usually too stiff of a spring. They usually supply v-8 springs, but because the motor is back further in most street rods and trucks more of the weight is on the rear, and the V8 springs are too much. A friend of mine set up his truck with 350# springs, which was too stiff, even with cutting a coil.. he then used a set of 325# and felt that it was tolerable, but still a tad too stiff. He's going to try a set of 317# but he thinks those will be a little soft...

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Old 10-04-2008, 06:39 AM
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I have my Corvair vert on the lift now doing a engine overhaul. As soon as I get the motor back in I'll put the trk on the lift & remove one spring , cut 1/2 coil & see if that helps. If not I'll buy some 4 cyl springs.

Don
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Old 10-06-2008, 05:04 AM
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Don,

I am building a 48 chevy AD and have the exact same problem. The original springs just seemed very stiff. After a phone call to the folks who sold me the springs which were supposed to be 4 cyl. springs, I went to a local auto parts store and picked up another set of springs for a 4 cyl. mustang. Completely different springs. The new ones were taller but softer and it was a ***** putting them in. After getting them in the ride was lower but still too tall and the sprpings are bowing a little. I was told to let them be to see if they would "settle". Haven't got the truck on the road yet but I'm going to wait and see.

Barry
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Old 10-06-2008, 06:12 AM
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That confirms my past findings that 4 cyl springs with 1/2 a coil cut works for a lot of cars. I think that the AD truck has less weight on the front wheels than I was guessing.
Don
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Old 10-07-2008, 10:22 AM
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I jacked around for a year on my 1935 Ford with Mustang II.......I originally had QA1 coil overs and after many sets of springs (all of those are VERY short/stiff) I gave up on ever getting the suspension working, I resulted to running the stock six cylinder Ford coils, which were better but the ride heighth was still too tall. I knew that cutting the coils would lower it but mess up the spring rates. I went to my local NAPA store and ordered the four cylinder M II springs. Now the front end is the best it ever was. The springs are 14" long but at least I have some suspension travel now. I would like it a little lower but I will NOT cut coils to get there.
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Old 10-07-2008, 09:29 PM
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re: Must II IFS/Chevy AD truck

For setting up the Mustang II, when you get to the point that you are happy with the ride (most suspensions I set up do indeed have too stiff of springs to begin with) take a look at the angle of the lower control arms. If they are parallel or nearly so with the ground and the car is still too high, install some drop spindles. Heidts sells a nice unit to drop the car 2". If the control arms are angled down to the outboard, shorten the springs to lower the car. The increase in stiffness by cutting the springs will be minimal. In this case, take the shocks out of the mix and make sure the inner bushings have not been tightened with the control arms in the droop position. Put the truck at ride height before tightening any suspension parts. Especially with stock type control arms. Many cars are over-dampened as well, set the shocks full soft if adjustable and start from there.
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Old 10-08-2008, 06:35 AM
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Well dumb me. I have a sway bar installed in the Must II suspension. You can not get any movement by pushing down on one side rail, but push in the center of the frame & you can move it.
Can you normally get by with softer springs w/a sway bar?

Don
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Old 10-08-2008, 07:44 AM
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re: Must II IFS/Chevy AD truck

That is the beauty of anti-roll (sway) bars. You can, and in my opinion should, run as soft of springs as you can get away with, and then add an anti-roll bar to control body roll.
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