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Hi, I am posting this question for a friend. We have a '70 TR6R with a 4 speed tranny. We are trying to replace the 4 speed with a complete 5 speed tranny from a Bonneville. The questions are: What mods need to be done? What parts are needed? Any mods necessary to shifting mechanism? Are the inboard transmission cover/case different? The 5 speed transmission was installed on the bench and it does not shift.
I appreciate any insight or experience in making this conversion that you guys can give us.
Thanks.
 

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hi dirk,
with the power of a 650 being delivered at low revs,it did not need a 5 speed box.they have enough torque low down not to need it.the 750s needed 5 gears as power was developed higher up the rev range.it was also added just because the japanese did it.
i think you will find that in an acceleration race,with having an extra change,the 5 speed will slow you down.
best improvement is to change the 19 tooth chain sprocket to a 20 tooth....cheers :hammer: :hammer:
 
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THANKS a lot for the info. I will pass it along to my friend.
 
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