This is an M21 close ratio Muncie 4 speed for 1969 Z28 CAMARO, and is correct for other 1969 GM applications as well. This has a 10 spline input and 27 spline output. All internal gears are BRAND NEW AUTO GEAR CO.  Case is 3925660, extension is 3857584, shift cover is 3950306, levers are original, as is mid plate. Everything else in this unit, such as bearings, brass, sliding clutch's, shift forks, seals, bushing, countershaft and bearing retainer are, like the gearing, BRAND NEW. If you need a close ratio Muncie for your 1969 Z28, or other 1969 GM application, you won't find a better one. 12 month NON ABUSE warranty on this unit. Shifters are available and will be quoted based on your application. Case Coding to make a unit "Numbers Matching" to your application is available, CALL TOLL FREE for details and pricing.Questions? Call our HELP line TOLL FREE 1-877-614-4327 Monday thru Friday 8:00 a.m. to 5:00 p.m.