These complete transmissions are perfect for those building new bikes or just replacing that old worn out transmission. Just add oil, your choice of drive sprocket and release lever. The will fit most 4 speed frames from 1970 thru early 1984 and both versions feature close ratio Chrome Horse Motorcycle Transmission rated gears by Andrews. These gears are highly regarded for their smoothness of shifting and reliability. The 2.60:1 close ratrio first with 1.35:1 close ratio third is ideal for FL or heavier touring bikes. These gear sets will allow more usable first gear speed, eliminate the notorious 2nd gear "clunk" and will provide for more pull in 3rd gear. The third gear sets are also the loose roller style which are preferred by many builders. The Chrome Horse® heavy duty transmission cases are made from "356" aluminum alloy and are heat treated to "T-6". Other features include a chrome plated ratchet top assembly and kicker cover, and 1:1 ratio speedometer drive gears. All Chrome Horse® transmissions are carefully and thoroughly bench tested after assembly to insure quality and workmanship.