What are the opinions on doing the Guldstrand mod to a real 4P '67 car?

I was able to get the car for less than I was planning on getting a straight plain jane car to mod. I'm looking for the handling and performance and wanted to drive it hard at times. Also, it will get tubular upper control arms.

It isn't a numbers matching vehicle, although it has the original 12 bolt posi and round traction bar. The trans is a '67 M21, not matching, and a '69 Camaro small block with 4 bolt mains.

How much would it hurt the value of the car to do it?

There are no plans to put in subframe connectors (which I would have done to a base car) and no desire to sell it anytime soon.

Thanks for any opinions!

Be careful when mixing and matching components. Many upper tubular arms are not meant to work with the Gulstrand mod. Please research carefully. Since it is not a complete numbers matching car, I don't think it would hurt the value. In fact, right now a properly built car with the right combination of aftermarket parts seems to be worth more at the moment.

Mike

Mike, I see no reason not to run tubular uppers with the Guldstand mod. Each one helps in a different way on the bad stock geometry.

sci-flyer, if you are concerned about cutting holes in your rs/ss, (that is one tough call) why not go with a taller spindle and tubular uppers. Fat Man has just released theirs, I worry about the 2" drop though. You also have the new spindle from ATS. That one will be out in early August. It has slighly more than an inch drop and is a taller spindle. The drop on that spindle will not get you in trouble with your steering arms. Just some options for you.

Brian

Tubular upper arms will allow greatly increased positive caster, like 5 deg +, this will tilt the tire in (at the top) when you turn the wheels. It's like neg caster that only kicks in when you turn the wheel.

A Camaro spindle has 8.75 deg (Spindle Inclination, or KPI Kingpin inclination) angle between the spindle and balljoint centerline. If you had zero positive caster set on your car and could turn your wheels 90 degrees, the tires would lean out 8.75 degrees! Of course you can't turn them 90degrees, but you can turn them about half of that, so your tires lean will out about half of the spindle inclination, or 4.3 degrees.

High positive caster helps most in tight radius turns, an agressive camber curve or Guldstrand mod helps more in high speed sweepers where the wheels are not turned very much.

If you don't have power steering, the high caster setup would make the car hard to steer.

So, I think tubular arms (DSE, Global West, Speed Tech) that increase positive caster are a good solution, even without the Guldstrand mod. A taller upper balljoint is available that will improve the camber gain without doing the guldstrand mod, it just raises the other end of the upper arms. The upcoming taller spindle from ATS is going to be a very good solution for agressive driving or competition use.

also if you are using tubular upper control arms, you won't have to do anything to the upper control arm mount, but drill new holes. you won't have to hack off the ears of the mount because the new control arms will clear it easily, i would do it

cody,
Thanks for bringing that up. With tubular upper arms you don't have to cut up your frame mounts and you can easily reverse it leaving only the two "extra" holes you drilled.

Brian, I don't disagree with you. I was making a point not to just go out and throw a bunch of different suspension mods on a car without knowing what each one does or how they affect one another. Mixing and matching should only be done after lots of research and questions.

Mike