hm12460 53 #1 Posted September 19, 2010 would have an interest in swapping out my 4 speed with an 8 speed. Is this a direct bolt in? Share this post Link to post Share on other sites
rmaynard 15,603 #2 Posted September 20, 2010 I don't see any reason why it wouldn't work. It should be an easy swap. I'm sure someone will correct me if I am wrong. Bob Share this post Link to post Share on other sites
hotrodmerc 1 #3 Posted September 20, 2010 I have done the 4 to 8 speed swap. The only thing I had to do was fab a different brake arm. It is fairly straight forward. Share this post Link to post Share on other sites
snookman1 1 #4 Posted March 25, 2011 in 1974 - 1975 the b80 used 4spd. uni-drives model 5084 and in 1976 they swapped to a model 5091 8spd.(b60, b80, b-100, c120, c160.) and 1977 model 103907 8spd.( same models as 5091 8spd.) should be an easy swap. Share this post Link to post Share on other sites
