I have a set of these on the front:
Buy ACDelco Specialty 519-36 Front Spring Assisted Shock Absorber: Shocks - Amazon.com âś“ FREE DELIVERY possible on eligible purchases
www.amazon.com
and these on the rear:
Buy ACDelco Specialty 504-511 Rear Air Lift Shock Absorber: Shocks - Amazon.com âś“ FREE DELIVERY possible on eligible purchases
www.amazon.com
You can put a bunch of air in the rear and it stiffens the ride but it does raise the rear.
So it looks like you want more spring rate F and R which I agree with, but both these solutions will raise the car, which is something I don't want to do, especially with the size and mass that is already there... that needs to go as low as possible. I didn't even know those front springs existed...
The front, if the suspension needs rebuilding, will wander all over the road.
The guy that I bought it from literally just put it through a PA safety inspection and just put $1300 worth of front suspension and steering parts on it (they all still have the coat of "paint" that they come with out of the box that washes off the first time it rains on it). I'm assuming (but I haven't jacked it up and tested it yet) that those parts are in good shape, but I'm not thrilled with the alignment from what I'm feeling, I feel like it needs the cross camber set better, and it needs MUCH more caster for the road feel that I'd want.
If you are going to replace springs, then now would be a good time to go through it all since you'll be disassembling some of it to remove the springs. I do recommend a good spring tool so you don't hurt yourself. If in fact you do take the upper and lower control arms off and have them rebuilt, don't tighten everything up while it sits on jack stands as it won't settle correctly. Get it on the ground with some blocks under the lower control arms and then tighten everything up. I have to do a full front end rebuild on my hearse because the springs and bushings are shot but I'll be pressing in new bushings and not replacing the control arms. It is much cheaper to go that route especially with the added weight on my vehicle. Here is the spring tool I use:
Buy OTC 7045B Front Coil Spring Compressor: Coil Springs - Amazon.com âś“ FREE DELIVERY possible on eligible purchases
www.amazon.com
The price has gone up considerably since I purchased mine in 2016 but it is a very good tool and you may find one similar to it cheaper elsewhere.
I used to be a competitive autocrosser, road racer, and regular drag racer and used to work at a speed shop doing installs and custom fabrication. I appreciate the pointers, and I own that style of spring compressor as well as 2 others (that one is my favorite for doing GM front springs, though on many if you go short enough you don't need a spring compressor to install if the car is heavy enough).
One of my "street" cars which gets raced a bit is an '87 Trans Am which I have homemade front weight jacks and viking rear adjustable coilovers, full tubular K and and custom fabricated tubular front and rear suspensions. Right now I'm running 950lb front springs and 200lb rear springs, everything, including ride height and corner weights are fully adjustable and about 80% of the parts I build myself.
I saw that you were a new member so welcome.
Thanks!
For tips and tricks you can also look at the forums below. If you have to replace the EGR Valve, the people on that forum recommend the EGR valve for a Camaro / Firebird with a standard transmission as they seem to hold up much longer than the standard Cadillac one. This forum has a lot of good information and people that have a lot of info regarding Cadillac products. For part numbers, I go to GM Parts Giant and try to find the original number then cross reference it out using Google. There is also Rock Auto which carries a lot of parts for older cars but be careful with them as they do charge shipping and sometimes they ship the wrong thing. There is a guy who can reprogram PCM modules and I found him on one of those forums and I think he charges about $75 to program them but I could be off on the price. Lots of GM people in here, unfortunately I'm an odd one because I own all Fords and one VW.
A forum community dedicated to Chevy Impala SS owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more!
www.impalassforum.com
A forum community dedicated to all LS1 and LT1 powered vehicles owners and enthusiasts. Come join the discussion about performance, specs, builds, conversions, swaps, modifications, troubleshooting, maintenance, and more!
www.ls1lt1.com
Again, thanks for the tips.
I've posted almost the same question to one of those forums already with no answers:
KYB or Bilstein?
Since my car is a '93 the engine is an L05, which I'm very familiar with since I owned a '92 K1500 Blazer with the same drivetrain and back in the day I was involved with the original GM ECM hacking movement which focused on the TBI ECM's. My first "race" car was also an '83 Crossfire Trans Am, one of the earliest TBI cars, and that got replaced by a '97 WS6 Trans Am that I bought new and was one of my most serious race cars, so I'm very familiar with the LT1 drivetrains.
The current "race" car (lol, or street car depending on when you ask me), the '87 Trans Am with adjustable custom everything suspension, also has a weird bastard engine, a small block bottom end, with aluminum LT1 heads which I welded the coolant passages and a bunch of the bolt holes shut, repositioned/re-routed them and made them work on the small block, then converted an old school victor Jr intake to EFI and added an LSx style throttle body.
As far as parts I still have some of my contacts from the speed shop, and a friend of mine is the parts manager at the local Cadillac dealer
Lots of GM people in here, unfortunately I'm an odd one because I own all Fords and one VW.
Ford stuff huh?
My daily driver is a 2012 Taurus SHO, which I'm ditching and replacing with this FLB- I like the twin-turbo awd chassis and the creature comforts, but with the cam phasers being a $6-7K repair and it suddenly becoming a basket case (2 random different coolant leaks, various sensors...) I've decided it's time for it to go. The SHO and the FWB are about the same weight and I'm hoping to end up with similar handling and acceleration from the FWB, but in a more reliable, traditional package.
My other project is a '71 Mach 1 Mustang- M code 4bbl ram air car with the factory track pack (factory C6 trans with high stall converter and shift kit, factory 4.10 gears and detroit locker, staggered rear shocks and suspension setup for drag racing...)
I also have a Cummins Dodge which puts down over 1000lb-ft to the ground through 36" tires riding on modified Hummer wheels...