Nope, the other way around, gl forks in cx lowers, not trying to get dual disc brakes.If you're thinking to put the GL500 lowers on your '82 CX forks for dual discs, note that the axle attachment is totally different. The change would have an impact on trail and handling.
I have an 82 cx500 custom that is in show room condition. I want to keep my cx500 custom sliders. I have been thinking about using fork tubes from a gl500. Will it work? Please if anyone knows.Welcome to the forum. Please add your location and your bike's model and model year to your profile so that you don't have to remember to tell us every time and we don't have to keep asking when you forget (see Forum Settings link in my signature).
And welcome to the world of antique vehicle ownership (they own us, not the other way around). Your bike is about 4 decades old and may or may not have had all of the maintenance necessary to keep it safe & reliable so it is highly recommended to download the Factory Shop Manual for your model (available through the CX Wiki - link in my signature) and go through all of the service procedures, regardless of whether your bike has reached the specified mileage.
I also recommend looking on all rubber parts with suspicion because rubber does not age gracefully. Check the date codes on your tires and replace them if they are over 5 years old no matter how good they look & feel (old rubber simply cannot flow around the irregularities in the asphalt well enough to grip, especially if it is cool or wet). If your bike still has the original rubber brake line(s) (should be replaced every 2 or 3 fluid changes = 5 or 6 years) I recommend shopping for modern stainless braided ones (they last practically forever and double the life of the fluid). And don't forget things like the rad hoses and the boot between the engine and swingarm (they can crack on the bottom where you don't see it).
The best advice anyone can give you about customizing any vehicle is to get it safe & reliable in more or less original condition and use it for a while before you start making any changes so it can tell you what changes it needs to make it do what you want/need better. That approach almost always results in something you actually want to keep and use but making changes based on style or on what someone else (who may or may not really understand how the changes affect the way it works) has done often results in a piece of expensive yard art that you can't stand sitting on for more than a few minutes and might even be dangerous.
Changing the forks is a good example of that and asking on the forum shows that you are thinking about the effects and trying to keep it working right instead of making changes and finding out the hard way.
If I'm reading you right you want to replace the sliders on your GL500 with ones from an '82 CX500C (they are different from the forks of other CX500 models). Both models have 35mm diameter stanchions so it would be possible to assemble working forks using parts from both but (as Randall mentioned) the GL500's axle is centred on its sliders while the CX500C's axle is mounted in front of its sliders.
The "C" in Honda model numbers stands for "factory Custom", which means "styled to look like a chopper". Choppers generally have elongated forks at often silly rake angles, resulting in trail that is increased enough to make it difficult to steer at low speeds (not to mention "chopper flop"). Honda's engineers located the axle ahead of the forks to allow the rake that the style required while maintaining a more reasonable trail for decent handling.
What that means to you is that if you use Custom sliders on your SilverWing the trail will be decreased. Low speed steering could become twitchy and it would not be as stable at highway speeds.
Well, if stanchions=fork tubes, then yes we understand each other. Except that maybe you meant cx500c and not cx600c.OK, so what you actually want to do is replace your CX600C's stanchions with ones from a GL500? If that is the case, as long as they are about the same length the handling shouldn't change.
BTW: 2.365"/61mm (I'm not sure where you got that number but it sounds close) of trail doesn't sound like much but it would be about a 60% increase or decrease and that is definitely significant.
FWIW, when I attached a sidecar to my GL1100 its 5.3"/135mm trail made the steering very heavy compared to the outfits I'd had previously that all had trail close to 4"/100mm. I lived with it for a few years while I investigated ways to reduce the trail (this is a common modification for bikes with sidecars but can be very expensive). In the end I decided to change to leading axle fork sliders from a different model, which I figure reduced the trail by about 30-35mm and made it much easier to steer.
Yes, aesthetically pleasing longer forks, and comfort. I got this bike late in the season last year and unknowingly rode around with no air in the forks. When I realized there was no air in the system, I added air, the front end rose up, it felt like a different bike. Was much more comfortable and I'm looking to possibly increase that ride feel and the look.Are you looking to replace damaged stanchions and have GL500 parts available? Or are you looking for longer forks?
As far as combining the two assemblies, as I said, you'll need to look at the respective parts fiches and compare the damping mechanisms. I've pondered the same question in the past, but never did the requisite digging to find an answer.
Endgame would be longer forks. More of a chopper look. Only looking for a few inches more. If and when I replace fork seals, I will seriously consider doing this swap. Just wanted someone to tell me whether or not it bolts right together, for future reference since there is nothing on the internet of anyone doing this. All I have seen is people wanting to shorten their forks, but that's not my speed.I do believe GL500 forks tubes are longer than the 82 CX500's tubes.
I'm wondering what the reasoning/endgame is here for this modification?