OMG- I have a 4x4 tbird! - TCCoA Forums
 
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post #1 of 9 (permalink) Old 10-29-2006, 06:42 PM Thread Starter
 
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OMG- I have a 4x4 tbird!

I just put in a complete MarkVIII subframe and diff with all poly bushings. I used spring perches from Thomas and 1 poly isolator on the perch with a factory rubber one on top. The tall part of the spacer faces outside. The car sits about 2 or 3 inches higher. Surely the small weight difference wouldn't be the only culprit. The front is slightly jacked up from a glass hood also.

So what are people doing for springs when they use MarkVIII arms? Lowering springs? The rear is very stiff now and I fear cutting a coil might make it TOO stiff.
The ride isn't any rougher, but pushing on the bumper just isn't as mushy as before. It takes probably 300 lbs to make the ride height the same as before.
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post #2 of 9 (permalink) Old 10-30-2006, 06:46 AM
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Did you tighten all your bushing bolts while it was still in the air? Or did you sit it down on the wheels, bounce it up and down a few times, and then tighten the bolts?

If you don't you might preload the bushings and it won't sit as it should.

Just a thought...

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post #3 of 9 (permalink) Old 10-30-2006, 07:27 AM Thread Starter
 
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The poly bushings don't preload at all. The only one that isn't poly is the inner upper a-frame. Thanks for the thought, though
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post #4 of 9 (permalink) Old 10-31-2006, 12:44 PM
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Get yourself a really big 300lb subwoofer.

Sounds kinda freaky. Got any pics?

My guess is that poly doesn't compress like rubber bushings and you added height by using mark lower arms and a coil spring perch. your is the second post I've seen about poly spring isolators jacking up the rear end. Maybe astick your old rubber ones back on the bottom spring and see if ride height drops.

What springs are you using?

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post #5 of 9 (permalink) Old 10-31-2006, 02:39 PM
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I wanna see pics!
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post #6 of 9 (permalink) Old 10-31-2006, 06:20 PM Thread Starter
 
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Okay. Tomorrow I will take a pic.

Running the oem LX springs.

There's an extra 75 lbs. worth of speakers, spare tire, jack, ect.. in the trunk. The diff braces probably offset the weight reduction of the pumpkin. Filling the gas tank didn't make a noticable difference.

I'm going to just cut one coil at first. If that isn't enough I can remove the poly isolator.
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post #7 of 9 (permalink) Old 11-01-2006, 08:32 AM Thread Starter
 
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http://members.cox.net/93tbird/frame...ing/jactup.jpg
http://members.cox.net/93tbird/frame...ng/jactup1.jpg

The rear tire to fender clearance has more than doubled. The front is about an inch higher.

Those are 245/60/15 tires.
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post #8 of 9 (permalink) Old 11-01-2006, 11:18 AM
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I would think you'd be fine cutting a few coils off the stock lx springs since they are so soft. I would pull the poly isolators first though.

97 T-Bird Sport: Dynomax catback, Removed silencer w/ K&N panel, DReinhart chip, Lightning AGSF12-FM1 plugs/180 stat, Tokico 1.25" dropped stance, bye bye fender gap

'79 F100 SB : 300 ci six, Hurst Mastershift 3spd floor shifter, Offenhauser intake, Holley 4 brrl, EFI manifolds, Chebbie Rockers, Summit Racing 3.50 gearset, DISO 2.5" diesel muffler and 2.5" exhaust, Its'a six?!
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post #9 of 9 (permalink) Old 11-04-2006, 05:36 PM Thread Starter
 
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I just cut one coil from the bottom of the rear springs. Put the ride height back where it was. The front needs like 1/2 coil cut due to the hood. That might wait until I decide whether to use aluminum heads.
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