"SUPERCASE" Muncie 4 speed. M20/21 , Super Case, NEW SUPER STRONG yet Lightweight Auto Gear Aluminum Mid Plate, EXTRA HEAVY DUTY Tailhousing. This transmission is ALL BRAND NEW, not a used or reconditioned part in it. Ratios for the gear train are as follows: m20 1st gear is 2.52, 2nd gear is 1.88, 3rd gear is 1.46, 4th is 1.00. and the m21 is 2.20, 1.64, 1.28 and 1.00. This unit can also be built in M22 or the new M23 versions, CALL FOR AVAILABILITY and COST. The best quality Auto Gear Engineering "SUPER CASE" Ready to deliver reliability behind those "Big Blocks" and small blocks too! FITS 1971 THRU 1974 GM CARS, AND ANY "CUSTOM APPLICATION" YOU MAY HAVE. This can also be built in a 10 spline input with 27 spline output for the 1963 - 1970 GM vehicles. QUESTIONS? Call Monday thru Friday 8:00 a.m. to 5:00 p.m. ORDER YOURS TODAY 1-877-614-4327 TOLL FREE
Note: All Muncie 4 Speeds are Built To Order, Call Us With Your Application for Current Build Time and Delivery Date.