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Old 01-02-2013, 11:21 AM   #1
Joined: Apr 2009
Location: Looking for fuel
Oddometer: 498
Transmission compatibility

What is the difference between the R80 G/S and non-G/S transmissions? Are they interchangable?

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Old 01-02-2013, 11:40 AM   #2
Joined: Aug 2010
Location: western pa
Oddometer: 1,706
depends on what year tranny you want to swap in it, can't remember what years you can switch. the only difference I know of in the range of trannys that will fit, is the G/S has a kickstarter.
I've swapped trannies in mine when my original needed rebuilt, putting a loaner in so I could still ride.
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Old 01-02-2013, 01:58 PM   #3
The Bavarian Butcher
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Joined: Sep 2009
Location: Atlanta, GA, USA
Oddometer: 3,583
Anything 81 to 95 will 'work' ... and are interchangable. There are some subtle differences (like the kick starter) ... but they all work.

All of the 70 - 80 transmissions are interchangable too ... even those 4 speed (with kick) trannys on a 77 RS. Kind of fun ... but have you ever tried kicking over a 1000cc high compression engine?

It hurts, and God help your knee.
Fred <|> Need an Airhead Part? .... I May Have It!
'85 BMW R80RT G/Sified <|> '73 BMW R75/5 LWB <|> '94 MZ Silver Star Hack
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Old 01-02-2013, 02:56 PM   #4
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Joined: Mar 2011
Location: Silver Spring, Md
Oddometer: 10,229
There is a difference in the output shaft seal if the trans fits a dry drive shaft bike, i.e. Para Lever, I think. You can change the seal to suit the drive shaft, if you need to.

All Airheads pre 1981 are long input trannies, whether 4 or 5 speed. All Airheads 1981 and after are short input shafts. There are a number of other changes that accompany the input change so it's best to just stick with what you got. Any GS or G/S bike will automatically be a long input won't it? Did they not start until 1981 or after?

EDIT; I mean G/S and GS will be a short input!!! (I typed wrong)
Never memorize something you can look up.
---Albert Einstein

Pay your debt, piratejohn.

disston screwed with this post 01-02-2013 at 04:07 PM
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Old 01-04-2013, 08:55 AM   #5
Joined: Apr 2009
Location: Looking for fuel
Oddometer: 498
Thanks for all the replies / education. Friend of mine may have to rebuild his tranny, which is overseas and parts procurement is difficult so I was looking into alternatives.
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Old 01-04-2013, 11:44 AM   #6
Joined: Mar 2008
Location: Nelson New Zealand
Oddometer: 3,761
I swapped over a 81 r65 to a 91 GS & the only difference was the gear lever - swapped them over & good to go.
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