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Discussion Starter #1
most w/ 9c1's and intrax springs have found the rears will fall out at full droop. do any of the other mfrs fit 9c1 rears correctly? currently riding on intrax in front and imp ss in rear, a little too much rake for my taste but don't want to raise the front back up. by the way, if anyone wants the skinny on intrax's plans, just ask. i have been speaking to them for a little over a year about this and yes they consider it a safety issue. thx, troy
 
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Discussion Starter #2
Email or post here about this please. I have Intrax springs for my 9C1 but not yet installed. If there is a safety issue that I may want to be concerned about, let me know.
 
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Discussion Starter #3
9c1 cars were designed for addl suspension travel so. the rear springs are too short. if you jack the car up, you can literally reach under the car and grab the spring and pull it out (there's about 2 inches between the top of the springs pigtail and the spring seat. lots of folks run em and i haven't heard of any accidents. also, the drop is considerably greater than advertized when installing on a 9c1. intrax told me ~2yr ago they had a replacement developed that should be completed around the end of the year (that was 2001). this week, they indicated they would be available end of this year. at one point, they even discussed letting ME test on my car, but I lost out to a DARE officer somewhere. Originally they had TWO sets available for testing but one of the guys totalled their car so i don't know where that set is. bottom line, fronts are fine, rears can fall out. i was most worried about my wife trying to change a flat and then installing a spring on the side of the road. i expect a bunch of folks will ring in and tell you how fine they are on your car, but call intrax and ask if they'll assume any liability on police cars. they don't fit.(9c1 rear suspension).
 
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Discussion Starter #4
What's so much different about the Impala rear suspension then my suspension?

- Brett Smith
 
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Discussion Starter #5
there are a few differences. gm anticipated considerable abuse on police suspensions and implemented some minor changes to increase suspension travel. rears are ~5/8" narrower(which is why the impala wheels sit further in the wheel well on police cars. obviously bilstein shocks vs decarbon, 9c1 springs are about 1.5" longer unsprung than impalas (check w/ dal, he'll conf.) i may be mistaken, but i believe there is a difference in brake pad thickness. there seems to be no problems w/ intrax on impalas. i installed the impalass rear springs w/o a compressor(hands only) on my 9c1. the intrax springs are 1.5" shorter unsprung than impalass. also the advertised drop is for impalas and nearly doubles when installed on police cars. i got nearly 3" drop in the front and terrible sag in the rear before they came right back out. apparantly, there is a difference in the spring land. intrax is VERY familiar with the problem.
 
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Discussion Starter #6
ON my 94 9C1 I don't think the rear spring would fall out without diconnecting the shock. The spring is still captured untill the shock is disconnected allowing additional drop.
Robert
 
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I just realized you guys are speaking of a shorter than stock spring. Yes you definatly have a problem unless you extend the cup with some sort of modification.
My previous reply was concerning a stock spring.
Robert
 
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Discussion Starter #8
The Intrax rear spring will NOT fall out unless you've got extremely long shocks, which if you have a 93+ you shouldn't. I have them on two cars which have had the rears up in the air plenty of times w/o ever falling out.
 
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Discussion Starter #9
i can only address my particular vehicle and intrax's response to my concerns. it may work fabulously on other's vehicles. however, if a jack is placed under either side of my car, there is a measured 2" of space from the spring pigtail to the perch. i can reach in and remove it with by hand.(with the shocks still attached). how often are our wheels OFF the ground when under way? chances are good if they are, we'll here glass an smell s#@t, but it is a safety concern, especially if someone like MY wife(said mechanically challenged) were required to change a flat and dropped a spring. but, don't ask me, ask intrax, they say it aint right. back to the subject at hand, do any of the other mfr fit better? i would really like to get rid of the nosebleed rake and level out.
 
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Discussion Starter #10
mine is a 95 and i am open to suggestions, i think carl (bonnie guru) made something to extend his. but please, input is what i'm looking for, keep it coming and thanks. troy
 
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Discussion Starter #11
I am with Threeimpalas on this one.

I am assuming you have the extra long 9c1 shocks and that is letting the rear drop an excessive amount.

I had intrax in the rear of my car (changed them back out for my 9c1 springs with no isolators) because the Intrax made the rear of the car look saggy. The frame was perfectly level, but it just looked low...

Oh I have the 0929 bilstiens and my springs never fell out.

You could always zip tie them to the axle tube/top mount if your that concerned..
 
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Discussion Starter #12
The longer shocks were specified for the 91-92 cars so the axle would drop further to help clear the more restricted wheel opening during tire changes.

Bilstein developed the digressive valving "floaty" 1516/1517 shocks early in the life of the last (91) B-body, and never did produce that same valving setup in a shorter rear shock. The pre-91 "boxcar" used the 1104/0929 shock setup, (linear valving), and it was/is only offered in the "short" version.

If you want to be creative, and are staying with long shocks or if you have really short springs, fabricate a couple of drop-limiters--get some link chain (not too small, not too big) and figure out an attachment point on the axle and on the frame. Make the chain short enough so that it only lets the axle drop away from the frame to the extent that the rear spring(s) will remain in place. Make the setup detachable, of course, for when you really need to drop the axle. The other thing you should do is take some lengths of hose and put it over the chain to dampen the noise it would otherwise make.

Without digging into some parts books, I really don't know if the later 9C1's still were spec'd with the longer shocks, either due to suspension/shock travel requirements for the 9C1's higher ride height compared to the Impala SS, or for other reasons which aren't as obvious.
 
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Discussion Starter #13
keep it coming gentlemen, i appreciate ALL the input. this forum is a rare commodity, an excellent tool.
 
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Discussion Starter #14
navy, thats a good idea. think ill do that when i change out my springs
 
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