Introduce?? Increase is probably the more accurate descriptive when talking about G-body front suspension geometry.I bought a new 79 grandam because of the handling. I up sized both front and rear sway bars, urethane bushing, went to nitrogen charged shocks and 8” ta 6.6 flakes with 245-60 tires. If you change front wheels try to keep the original offset as the front tire contact patch in relation to the steering pivot axis needs to stay close to stock. It’s easy to introduce bump steer if you get too far from stock. All these helped but I don’t have any hard data to share. I failed to mention the 71 gto engine.
The rear sway bar is a Hellwig adjustable pro-touring bar on the loosest setting right now. When I was looking at rear bars some of the g-body handling guides were even saying not to run one in the rear but I'd have to dig again to find that info. I can tighten it up but I'm already getting some pretty good oversteer coming out of corners if I get into it too fast.Just catching up on this thread. Everyone has mentioned shocks, improved front geometry with arm relocation or tall ball joints.
Two additional add 'ons' to previous comments, if using stock arms in the front or rear, the bushings need to in excellent condition or poly - they CANNOT be sloppy if you expect consistent performance and adjustability. 2nd - tires - low sidewall is important and width as well. Something like a 245 or 255 / 35 or 45R18 up front and a minimum of a 275/40-50R18 out back. A 305 or 295 in the rear will help.
Looking at your list and comments - your rear sway bar is way too small diameter, and get the biggest production bar for the front at a minimum (1.125" I believe). Cutting coils for ride height works for ride height, but not good for handling. If you plan to stick with standard shocks for a bit, then get a set of Bilstein B6's. They are double the price of stock replacements, but about 8 times the performance - I swear by them.
And no matter what you end up with, it will need a proper alignment by someone that knows what you're after. The front end specs from the factory need to be thrown out if you expect it to handle.
My previous experience with this is on only one car. Stock front arms with new bushings. New tall ball joints upper and lower. Rear UMI upper and lower bars with the UMI rear sway bar. The F41 front bar. Homemade stiffeners on the both ends of frame. Rear seat support panel (doubled as a firewall). Factory joust bars and a proper alignment. It was waaaay better with these parts. When the 18" tires that I described above were put on, holy bejesus - it out handled my wife's 2016 Fusion Sport. But still not at the point of a C6 or higher Vette or most any BMW, Audi, etc. But it made it pleasurable to drive - and it didn't half of $6000.
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