1981 Interstate, Differential swap


Information and questions on GL1100 Goldwings (1980-1983)
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wingydingy
Posts: 2
Joined: Wed Oct 23, 2013 5:06 pm
Location: Mount Pleasant, Texas
Motorcycle: 1981 Interstate

1981 Interstate, Differential swap

Postby wingydingy » Wed Oct 23, 2013 5:18 pm



Can I swap out the Differential from a newer bike with mine? I would like to have a taller gear standing so it would tach less running down the road at 75 mph. I would also like to go to a 16 inch rear tire. Just looking to see what my Oppositions are.



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Sagebrush
Posts: 96
Joined: Tue Mar 09, 2010 5:47 pm
Location: Raleigh, NC
Motorcycle: 1981 GL1100
1982 GL1100
2001 GL1800 CSC Trike
2002 GL1800

Re: 1981 Interstate, Differential swap

Postby Sagebrush » Thu Oct 24, 2013 6:21 am

There are no rear drives from other bikes that bolt right up to the 1100s. I'm thinking it would take some engineering and fabrication to do it and it would probably involve replacing the entire swing arm and drive shaft.

As far as replacing the rear with a 16 inch tire the easiest way to do that is to replace the swing arm and drive shaft from an 82 or 83 model. It bolts right up. The reason you want to do this is because the 82-83 swing arm is wider than the 80-81. If you don't swap the swing arm you may run into a rubbing problem at the right front of the swing arm.

wingydingy
Posts: 2
Joined: Wed Oct 23, 2013 5:06 pm
Location: Mount Pleasant, Texas
Motorcycle: 1981 Interstate

Re: 1981 Interstate, Differential swap

Postby wingydingy » Thu Oct 24, 2013 4:49 pm

Thank you very much! So I will just keep riding the wing slower than some of the newer bikes. It still just humm's along. :D

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RoadRogue
Posts: 1919
Joined: Sun Jun 06, 2010 10:51 pm
Location: Castlegar BC, Canada
Motorcycle: 1997 1500SE

Re: 1981 Interstate, Differential swap

Postby RoadRogue » Thu Oct 24, 2013 11:10 pm

You should not worry about the RPM at 75mph , these engines are built to rev and will do so all day long. Go ahead and let it spin right upto the redline. It starts making power after 4000rpm.8-)
Ride safe, Todd
Over night campers welcome

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brianinpa
Posts: 38
Joined: Thu Mar 25, 2010 7:13 pm
Location: Lebanon, PA
Motorcycle: 1981 GL1100 Standard - Vetter State
1984 GL1200 Standard

Re: 1981 Interstate, Differential swap

Postby brianinpa » Tue Oct 29, 2013 6:48 am

I find that at 4500 - 5000 RPM's that is just where my 81 likes to hum along at highway speeds and everythin feels right. Sure it drinks fuel a little quicker, but lock the throttle and lean back into the back rest, kick the feet out, and enjoy the ride. In August I made a trip to Inidana and back and my bike and the other (82) I was riding with performed flawlessly after hours of riding at those sustained RPM's. Nothing to worry about.
Brian

If you aren't having fun doing it, find something else to do.

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macd
Posts: 12
Joined: Fri May 24, 2013 6:49 am
Location: middleburg,florida
Motorcycle: 1981 GL1100I

Re: 1981 Interstate, Differential swap

Postby macd » Wed Nov 20, 2013 9:29 pm

I was given tounderstand that you could replace the rear gears with a VT700 to lower the rpms. I heard it on youtube (dawino6260).


Dave
Middleburg, Fl


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