Gearbox Ratio's

If you race a Sud or 33 you probably want to play around with the gearbox ratio's. However, Alfa seemed to play with these ratio's on a regular basis, using a mix and match of different diffs and individual ratio's. This table is an attempt to sort out which cars use which ratio's to hopefully help people choose and source there perfect box. I cannot confirm that these parts are all interchangable, but hopefully it will help. Remember that some boxes cannot be swapped around for various reasons. A 33 gearbox for a Sud on the road (or vice versa) would be a pain due to the speedo drive. A late Sprint box will only go in a late Sprint as they use a mechanical speedo and outboard disk brakes.

As you can see, lots of cars had the same gearboxes. I doubt anybody will want to use the diesel diff except for a speed record attempt on the Bonneville salt flats.

If you find any errors, or have any extra figures to add then please mail me.



Car Models Diff Ratio 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear Rev Gear
Alfa Sud series 1 ti, 1186, 4 speed 9/37 1:3.545 1:1.941 1:1.292 1:0.966 Mmmmmm 1:3.091
Alfa Sud series 1 ti, 1186 & 1286, 5 speed 9/37 1:3.545 1:2.062 1:1.434 1:1.115 1:0.931 1:3.091
Alfa Arna 1186 and 1350 single carb engines 9/35 1:3.750 1:2.050 1:1.387 1:1.027 1:0.825 1:3.091
Alfa Arna 1350 twin carb engines and 1490 11/39 1:3.750 1:2.050 1:1.387 1:1.027 1:0.825 1:3.091
Alfa Sud Sprint Veloce, 1490 for 1980 9/35 1:3.545 1:2.062 1:1.452 1:1.114 1:0.897 1:3.091
Alfa Sprint 1.3 & 1.5 non Green Cloverleaf 11/39 1:3.750 1:2.050 1:1.387 1:1.027 1:0.825 1:3.091
Alfa Sprint 1.5 Green Cloverleaf and Sprint 1.5 for Switzerland, Sweden and Australia 9/37 1:3.750 1:2.050 1:1.387 1:1.027 1:0.825 1:3.091
Alfa 33 series 2, 1.3 & 1.3S 9/37 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 2 Sportwagon 1.3S 9/37 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 2, 1.5 TI & 1.5 Giardinetta 9/35 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 2, 1.2 9/35 1:3.750 1:2.050 1:1.387 1:1.027 1:0.825 1:3.091
Alfa 33 series 2, 1.5 4x4 & 1.5 4x4 Giardinetta 9/37 1:3.750 1:2.050 1:1.387 1:1.027 1:0.825 1:3.091
Alfa 33 series 2 1.5 Sportwagon 4x4 Pre Mod 9/37 1:3.750 1:2.050 1:1.387 1:1.027 1:0.825 1:3.091
Alfa 33 series 2 1.5 Sportwagon 4x4 Post Mod 9/35 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 2, 1.7 QV & Sprint 1.7 10/37 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 2 Sportwagon non cat, 1.7 QV 10/37 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 2 Sportwagon 1.7 QV cat & Sportwagon 1.7 QV 4x4 cat 9/35 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 2 1.7IE and Injected 1.7 QV 9/35 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 2 1.8 TD Hatchback / Sportwagon 11/35 1:3.750 1:2.050 1:1.387 1:1.027 1:0.825 1:3.091
Alfa 33 series 3 1.8 TD Hatchback / Sportwagon 11/35 1:3.545 1:1.864 1:1.323 1:1.027 1:0.787 1:3.091
Alfa 33 series 3, 1.3 & 1.4 (OK, they are the same engine) 9/37 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 33 series 3, 1.5 & 1.7, including 16 V 9/35 1:3.143 1:1.864 1:1.323 1:1.027 1:0.854 1:3.091
Alfa 146 1.6 and 1.7 16v (flat 4 engines) 9/37 1:3.545 1:2.050 1:1.323 1:1.027 1:0.854 1:3.091


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