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Discontinued Closeout Items Scratch & Dent Items Installation & Technical Tips Customer Cars First Gen Customer Cars Second Gen Customer Cars Third Gen Customer Cars Fourth Gen Customer Cars Fifth Gen Customer Cars Gift Cards Prop 65 Warning Information Some Shop Cars New Parts Just In New Old Stock GM Parts NOS GM Floor Mats Camaro NOS GM Parts Exterior NOS Parts Engine Related NOS Parts Interior NOS Parts Under-Body Related NOS Parts All Other GM Models NOS Parts Chevrolet NOS Parts Buick NOS Parts Pontiac NOS Parts Oldsmobile NOS Parts Rare Original Used Gm Parts EXTERIOR GM ENGINE/UNDER-HOOD GM INTERIOR GM BRAKES/SUSPENSION/TRANSMISSION GM Nav Menu 4 Nav Menu 5 Nav Menu 6 Nav Menu 7 Camaro Model Years Model Years 1967 Camaro Parts 1968 Camaro Parts 1969 Camaro Parts 1970 Camaro Parts 1971 Camaro Parts 1972 Camaro Parts 1973 Camaro Parts 1974 Camaro Parts 1975 Camaro Parts 1976 Camaro Parts 1977 Camaro Parts 1978 Camaro Parts 1979 Camaro Parts 1980 Camaro Parts 1981 Camaro Parts 1982 - 1992 Camaro Parts 1993-2002 Camaro Parts 2010-2015 Camaro Parts 2010 Camaro Corner 2016-2024 Camaro Parts Home > Transmission & Clutch Components > Speedometer Drive Gear 21 Tooth, 3.31 Red - 3987921 Our Price: $12.95 PART NUMBER: TRA-132 Qty: Description New transmission speedo gear for your classic. Correct red color and 21 tooth design. Exact fit for all automatic powerglide , turbo 350 and saginaw or muncie manual transmissions. Will not work for automatic turbo 400 transmissions. Factory match for 3.31 rear axle ratio with stockish size tires. You may have to do some trial and error. See gear selection chart in the installation and info tips on the home page. Replaces original GM part number 3987921 perfectly. PART NUMBER: TRA-132 Features Excellent qualitySuper easy to install Other Great Parts That You Might Need 1967 - 1981 Speedometer Cable Retaining Support Clip, Each 1967 - 1968 Speedometer Cable with Firewall Grommet, 69 Inch 1967 - 1969 Camaro Speedometer Cable Firewall Grommet Our Price: $10.95 Add Our Price: $39.00 Add Our Price: $9.95 Add Share your knowledge of this product with other customers... 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