Hi guys. I found a great deal on Eibach Pro rear springs at a pull-a-part so I grabbed them. What I'm wondering is should I order the matching front springs or cut either my stock 84's front springs or I could get front springs from an 89 GTA from the pull-a-part and cut those.
I'd just order the Eibach springs, but I assume the only benefit is a matched spring rate. I am planning to add a sub box (probably fiberglass to save weight) for two 12's, amp rack, and possibly a second battery in the rear glovebox location. This will easily add 100 lbs over or beyond the rear axle. Would there be any benefits to the Eibach springs? I'd assume I'll need to do some cutting of the front's regardless to level things out correct?
Any help is appreciated. I've read many lowering threads, but since people usually order springs in complete sets it's an odd issue.

 

The biggest factor in "best" springs is the use of the car. Pro kits are the more liked of the eibach springs as the sportline rears have really low rates and all eibach rears are progressive springs which is fine for a daily driver/cruiser but for autoX/Road Race linear springs are ideal. A lot of people buy the moog stock replacement springs and cut them to their ideal ride height and (may want to read around and double check this) the shortening of the springs increases the rate to a very desirable rate. Enough for the weight of your stereo? i don't know but i know the info is on this site, I've seen it but cant remember it all.

Personally, I purchased weight jacks for my 92 camaro cause I autoX and like you have a hefty stereo in back. They weights jacks allowed me to choose a linear rate high enough to compensate for the added stereo weight and of course ride height.

 

I'll do some more research on the weight jacks then. I've seen them mentioned in drop threads, but never any mention of their purpose and didn't understand the function. They sound like exactly what I need. The little bit I do know about suspension and steering I've learned on here in the last four months. Thanks for the tips.

 

Same here. I try to only share what I feel I truly understand. I did a lot of research choosing springs. Read tons of threads and called several companies to get their spring rates and there suggestions for a suspension set up. I also wasn't sure bout the weight jacks at first but I was having trouble finding the "perfect" springs for me so I started researching the weight jacks and was very impressed. I found no negative reviews and they seem to offer everything I was looking for in a spring. Kinda pricy but I felt confident in wouldn't regret them. They arrive Thursday. Can't wait!

 

A lot of that depends on the driver. I agree, i like specific rate springs on both the front and rear of my car, and I've swapped out the rears for cut stockers or cut moog springs on the 2 cars that I've had with eibach pros on them, but not everyone does.

these cars really work best with relatively soft rear spring rates, so no matter what you run in the back you really can't cut them much without going with really soft rear sway bars. I typically cut about 1/2 a coil and then get rid of the thick spring isolators and replace them with some heater hose (and its not uncommon for the back of the car to still sit a little high, but usually I don't want to go with a higher spring rate in the back)

What weight jacks? What springs?

 

Forgive me if i misunderstood the question, but I'm referring to Ground Control Weight Jacks. Google them. They are what I believe to be the better alternative to coil overs for our cars. they go in place of the stock springs and allow you to adjust the ride height (about 3"), choose your spring rate, and all springs are linear. The tech recommended 850/250 springs for my car cause of all my dynamat and stereo. Those rates sound high for a mostly DD/occasional AutoX and I thoroughly questioned him on those rates but he was sure that was best for me.