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  1. #1

    Join Date
    Jan 2011
    Location
    Scottsdale, AZ
    Posts
    153
    The project is as follows: Swap the rear end from a 1983 Silverwing Interstate (GL650I) to a 1980 CX500 Delux (CX500D).

    I have both bikes and the Silverwing is a donor at this point. I like the appearance of Cast wheels that are on the Interstate and have swapped the front end to the CX500 to make use of the Interstate's heavier front forks and dual disk front brakes. To complete the modification, I would like to use the Interstates rear cast wheel on the CX500 as well. The problem is, the Interstate's rear axle is of a larger diameter then the one used on the stock CX500. The axles appear to be the same length. I believe I can over come the larger diameter problem by reducing the shouldered portion of the axle where it is held in place at the swing arm and using the Interstate's rear axle and rear end.

    My question is this: Is the rear end ratio the same for both bikes? Are the Transmission gear ratios the same for both bikes? Does anyone know if the Interstate's drive line splines will match with those on the CX500D?

    Any help or suggestions will be appreciated.
    Be the person your dog thinks you are.





    1982 GL500 Silverwing (perferct, 2500 miles)

    1981 GL1100 Goldwing Interstate

    1982 GL1100 Goldwing Interstate

    1983 GL1100 Goldwing Aspencade

    1987 Honda XL600r (built from a frame)

    1984 VF700 Honda Sabre

    2005 BMW R1200gs

  2. #2

    Join Date
    Jan 2011
    Posts
    47
    Pull the diff off and try it, only real way of telling, wont take you long, one problem might be the size of the rear wheel in relation to the swinging arm width / length.

    Hold on, major thourght, isnt the boss on the opposit side from the diff going to be a different size due to the spindle dia, is the thread size the same?

    Odie

    (uk)

  3. #3
    Senior Member Randall-in-Mpls's Avatar
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    Aug 2010
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    NE Minneapolis, MN
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    4,971
    You won't be able to use the GL final drive unit on the CX, unless you figure out how to work around the missing shock mount. The Silverwing, with its mono-shock rear suspension, doesn't have the necessary stud on the drive unit for the right-side shock absorber.



    [s]Both the Deluxe and the Silverwing have Reverse Comstar rims. Aren't they both 16 inches?[/s]

    Strike that. I forgot that the 650 wheels are different.



    R
    To inhibit vibration or oscillation, you install a damper. Installing a dampener merely makes it wet.
    ----------------------------------------------------------------------------------------------------------------------

    1978 CX500 Standard - The Black Maggot -> Green Grub, Red Grub, Yellow Grub???


    1981 GL500 Basket case -> AdvWing (Dual-sport conversion in progress) - Part 1 - Part 2 - Part 3


    1979 CX500 Deluxe rolling chassis -> Hmm?

  4. #4
    Senior Member Randall-in-Mpls's Avatar
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    Aug 2010
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    4,971
    Quote Originally Posted by odie View Post
    Pull the diff off and try it, only real way of telling, wont take you long, one problem might be the size of the rear wheel in relation to the swinging arm width / length.

    Hold on, major thourght, isnt the boss on the opposit side from the diff going to be a different size due to the spindle dia, is the thread size the same?

    Odie

    (uk)
    Odie, you are on this board. Did you get the email I sent through your Google profile? It was regarding this thread.



    R
    To inhibit vibration or oscillation, you install a damper. Installing a dampener merely makes it wet.
    ----------------------------------------------------------------------------------------------------------------------

    1978 CX500 Standard - The Black Maggot -> Green Grub, Red Grub, Yellow Grub???


    1981 GL500 Basket case -> AdvWing (Dual-sport conversion in progress) - Part 1 - Part 2 - Part 3


    1979 CX500 Deluxe rolling chassis -> Hmm?

  5. #5

    Join Date
    Jan 2011
    Posts
    47
    Quote Originally Posted by Randall-in-Mpls View Post
    Odie, you are on this board. Did you get the email I sent through your Google profile? It was regarding this thread.



    R


    yes i did thank you, even though i dont ride any more due to back / spinal problems my brain is still working (some times! lol), i forgot about the mono shock but he should check the width of his swinging arm to see if the rear wheel will fit, also might not fit due to bolts on diff being different positions to the stock one he has at the moment.

  6. #6
    Junior Member Tschulten's Avatar
    Join Date
    Aug 2010
    Location
    Cincinnati
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    10
    Quote Originally Posted by sw3dl1 View Post
    The project is as follows: Swap the rear end from a 1983 Silverwing Interstate (GL650I) to a 1980 CX500 Delux (CX500D).

    I have both bikes and the Silverwing is a donor at this point. I like the appearance of Cast wheels that are on the Interstate and have swapped the front end to the CX500 to make use of the Interstate's heavier front forks and dual disk front brakes. To complete the modification, I would like to use the Interstates rear cast wheel on the CX500 as well. The problem is, the Interstate's rear axle is of a larger diameter then the one used on the stock CX500. The axles appear to be the same length. I believe I can over come the larger diameter problem by reducing the shouldered portion of the axle where it is held in place at the swing arm and using the Interstate's rear axle and rear end.

    My question is this: Is the rear end ratio the same for both bikes? Are the Transmission gear ratios the same for both bikes? Does anyone know if the Interstate's drive line splines will match with those on the CX500D?

    Any help or suggestions will be appreciated.


    Disregard my post

  7. #7
    Senior Member richnct's Avatar
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    Aug 2010
    Location
    Connecticut, USA
    Posts
    1,305
    I think the 650 to 500 swap is fraught with difficulties, but if you procured a CX650C differential, at least it would have a shock mounting stud. They're not particularly rare or expensive. I don't know about the specific tranny gear ratios (I've seen the table somewhere) but the overall ratio is higher, that is the 650 engines run at lower rpm at the same speed relative to 500s. Usually the clutch assembly is used from a 650 to lower the 500's rpm, it's been written about numerous times and is well tested. I'm thinking I remember Panther and David/WI have had experience in this area. My memory isn't as sharp as it never was.
    '76 CB500T w/Velorex Hack

    '79 CX500C

    '82 GL500

    '83 GL650

    '83 GL650I

    '83 CX650C,E,T

  8. #8
    Super Moderator DaveF's Avatar
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    2,219
    The CX650C rear end has four mounting studs instead of three.



    Nothing is ever easy.
    1982 GL500I, 1983 GL650, 1983 GL650I

    My Web Site

  9. #9

    Join Date
    Aug 2010
    Posts
    97
    Think a GL1000 rear drive unit would bolt up to a GL650 swingarm? I have a '77 GL1000, a '78 CX500, and an '83 CX650C. When I had the rear wheels off at various times, it seems like the wheel drive splines are the same on the CX500 and the GL1000, but different from the CX650C--at least a Lester wheel for a GL1000 will line up on a CX500 rear unit. The GL1000 has three bolts on the swing arm, like the CX500, and it has a shock mount assembly, although while looking at it just now, it may not line up right. I don't know how the axle sizes, the driveshaft splines, or gear ratios compare to each other since I don't have any loose assemblies at this time--they're all bolted up again.
    '72 CB500

    '75 CB750K

    '77 GL1000

    '78 CX500

    '79 SR500

    '80 XS650

    '80 CB650

    '82 GL500I

    '83 CX650C

    '84 GL1200I

  10. #10

    Join Date
    Jan 2011
    Location
    Scottsdale, AZ
    Posts
    153
    Thanks to all for the posts and information. About 5 minutes after I posted this I realized the problem with the shock mount. This modification was for no other reason then to be able to run the cast wheel from the GL650I on the back of my cx500D. The front Mod went surprisingly easy with some minor set backs. I thought the rear would be as easy. It's really not worth the effort. I'll think about it and see if there is another way, but for now, I'll run the Com Star on the back with the cast on the front. The rear wheel is mostly covered by bags any way. Again, thanks.



    Quote Originally Posted by Randall-in-Mpls View Post
    You won't be able to use the GL final drive unit on the CX, unless you figure out how to work around the missing shock mount. The Silverwing, with its mono-shock rear suspension, doesn't have the necessary stud on the drive unit for the right-side shock absorber.



    [s]Both the Deluxe and the Silverwing have Reverse Comstar rims. Aren't they both 16 inches?[/s]

    Strike that. I forgot that the 650 wheels are different.



    R
    Be the person your dog thinks you are.





    1982 GL500 Silverwing (perferct, 2500 miles)

    1981 GL1100 Goldwing Interstate

    1982 GL1100 Goldwing Interstate

    1983 GL1100 Goldwing Aspencade

    1987 Honda XL600r (built from a frame)

    1984 VF700 Honda Sabre

    2005 BMW R1200gs

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