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ML WYDELL 01-02-2013 11:21 AM

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


bikerfish 01-02-2013 11:40 AM

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.

Beater 01-02-2013 01:58 PM

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.

disston 01-02-2013 02:56 PM

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)

ML WYDELL 01-04-2013 08:55 AM

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.

Padmei 01-04-2013 11:44 AM

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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