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Old 05-25-2009, 12:33 AM
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Springs, fact or fiction??

Building a 67 Impala using a frame from a donor car (old frame had a bad case of cancer), car has been apart for about 4 years and all is new or rebuilt on the suspension. EXCEPT the front springs. Car was born with a 327 and a glide. Now has 454 and turbo 400. Question is, after putting everything together the front end sits tall. Have had folks tell me that coil springs will, after a period of time extended with very little weight on them tend to stay stretched but will return to normal height after a period of time. I have also been told the front springs must be the incorrect ones, cut a couple of coils, etc. Anybody out there had this issue? Would love to hear from you.

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Old 05-25-2009, 02:47 AM
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Did you tighten the A-frame pivot bolts while it was jacked up? If so, you might just need to loosen them, bounce the front end a couple of times, then tighten them while the weight is on the wheels. I'd expect it to sit kinda low with all that extra weight under the hood.
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Old 05-25-2009, 06:35 AM
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I just started putting my 66 Elky back together.
After the frame removal, dissassembly and putting back together, I found that it sits quite high as well.

I bought a set of springs for a bigblock, and then took them back out and put the originals back in----did not come down even an inch.

Engine and trans are in the car, all bushing bolts are loose. Even the rear sits way higher than it did before I took it apart, and those are original springs as well.

Perhaps once I get the interior and front bumper on---it will drop some.
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Old 05-25-2009, 07:35 AM
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They don't stretch. you will sometimes see springs sag or "take a set" which means ride ht. will drop however this does not affect spring rate only rd. ht.
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Old 05-25-2009, 08:38 AM
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Quote:
Originally Posted by jimfulco
Did you tighten the A-frame pivot bolts while it was jacked up? If so, you might just need to loosen them, bounce the front end a couple of times, then tighten them while the weight is on the wheels. I'd expect it to sit kinda low with all that extra weight under the hood.
We have a "mechanic" that we farm stuff out to now and then at the shop. He does this all the time, it ticks me off! He will do a whole front end job and tighten all the bolts with a million pound impact wrench with the cars suspension hanging! GEEEZ, that is suspension 101 isn't it?

Brian
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Old 05-25-2009, 09:47 AM
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Springs, fact or fiction?

Thanks for the input. Makes me wonder if donor frame had incorrect springs. All is loose in the front end, have not tightened up anything as I wanted to get all the weight on the frame first then do adjustments. Did notice that the frame does flex down about a half inch in the front when raised on the hoist. (Front clip still off car and body mounts not tight)

Anybody out there know if original power steering pump pulley will line up with big block pulleys? I have a big block pump but has two returns where Impala only has one. Brackets look like they will work but appears to me that the pulley on old pump will be off about a 1/4 inch or so.

Also had dampner off to paint block and when replaced it seems to be about an 1/8 or so short of seating all the way down. Hate to beat on it, torqued to 85 ft. lbs. but still seems to need to seat on the crank farther.
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Old 05-25-2009, 09:52 AM
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I agree with all the comments above about torquing the suspension with the weight on the springs. Let me just add that it's possible that the upper end of the springs may not be seated properly in the spring pockets. On many GMs this is a blind installation, and on more than one occasion I've had to pull the front end apart and reinstall the spring properly. This can make the front end sit higher.
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Old 05-25-2009, 10:08 AM
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Once you get the front clip and the interior in it, it should start dropping.

Even my 59 sat high until the interior was put in.
(454/5 spd)

Once it was all ready to go-----the new 6004 springs caved and I had to get some stiffer springs. (also have 2" drop spindles on this car)

We'll see what happens with the 66---I want to keep it close to stock height.
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