4 Speed Conversion on 62 Jetfire With Power Brakes Home Page › Forums › Discussion Topics – Ask the Experts › 4 Speed Conversion on 62 Jetfire With Power Brakes This topic contains 1 reply, has 2 voices, and was last updated by jensenracing77 1 week, 1 day ago. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts January 9, 2019 at 7:19 pm #14403 johnsageParticipant I am considering replacing the automatic in my 62 Jetfire with the 4 speed manual transmission. The car has power brakes. Does anyone know of any issues making this swap into a power brake car? January 9, 2019 at 7:55 pm #14404 jensenracing77Participant The power brakes have to come out to go 4 speed. You will also have to go to a 1 inch diameter master cylinder when going to manual brakes. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.