Gear cluster is installed into a unique chrome trap doorDesigned to slip into stock transmission case.886:1 ''overdrive'' 5th gearCompact shifter technology increases width and strength of every gearWidth increase varies from 18% to 53% depending upon the loads each gear set must carryMade in the U.S.A.Modifications to exhaust bracket may be necessary.Oil filler spout spacer may be required on '02-'06 FL models.