GTA Corsa Close Ratio Gear Kit – Race 5th

£3,750.00 GBP (ex vat)


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Product Information

As used on all Alfaholics-R builds. Close ratio gear kit made for Alfaholics in the UK by the leading competition gearbox manufacturer. Gear ratios as per original Autodelta 1600 GTA. Gears are lightened as in the original GTA gearbox (drilled or scoop cut) and the layshaft is rifle drilled, in addition to the weight saving, this allows quicker gearshifts and reduced synchro wear as there’s less rotating inertia. We have also integrated needle roller bearings to all main shaft gears to reduce friction over the original bronze bush gear design.
This gear set is a must for high powered cars as the (very low ratio) standard first gear becomes essentially unusable as it was originally selected by Alfa’s engineers for engines of around 100 bhp. As a result we fit this gear set to all Alfaholics GTA-R builds as the extra torque allows a much higher 1st gear to be used without compromising performance. With a longer first gear, 1st, 2nd & 3rd gear can be stacked closer together to ensure the engine revs drop back onto peak torque when changing gear, resulting in much improved acceleration through the gears. This kit uses a 0.86 5th gear ratio for optimised rev drop in 5th for racing use.
All components are put through a final REM Superfinish process. This process polishes the surfaces of the components at a particle level resulting in a super smooth chrome appearance finish. This finish results in the oil getting worked less inside the box resulting in reduced frictional losses – the result of this is a nett gain of BHP at the rear wheels. We have been using the same set of gears in our works full race 1600 GTA for 12 seasons and in our works GTA-R 003 for over 60,000 miles, proving ultimate reliability along with the improved performance.

Input shaft and layshaft, all gears including 5th / reverse and idler.

For other assembly parts, see our Alfaholics Premium Quality Gearbox Rebuild Kits.

Standard 105 series ratios in brackets:

  • 1st gear 2.54:1 (3.304)
  • 2nd gear 1.66:1 (1.988)
  • 3rd gear 1.22:1 (1.355)
  • 4th gear 1.00:1 (1.00)
  • 5th gear 0.86:1 (0.791 GTV or 0.86 for Autodelta Corsa)

What’s Included

GTA Corsa Close Ratio Gear Kit – Race 5th

Close Ratio Gear (Kit)

Quantity: 1

Technical Details




All 105 / 115 Series







Coarse pitch tooth profiles for additional tooth strength


Required Per Car




Heat Treated EN36


Molybdenum Coated



Where prices are shown in any currency other than GBP sterling, please note that such prices are only indicative and are intended as a guide. You will always be quoted and charged in GBP sterling.

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