Transmission compatibility

Discussion in 'Airheads' started by ML WYDELL, Jan 2, 2013.

  1. ML WYDELL

    ML WYDELL NED

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

    Thanks.
    #1
  2. bikerfish

    bikerfish flyfishandride

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    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.
    #2
  3. Beater

    Beater The Bavarian Butcher

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    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.
    #3
  4. disston

    disston ShadeTreeExpert

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    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)
    #4
  5. ML WYDELL

    ML WYDELL NED

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    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.
    #5
  6. Padmei

    Padmei enamoured

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    I swapped over a 81 r65 to a 91 GS & the only difference was the gear lever - swapped them over & good to go.
    #6