GT40 Replica Parts & Sources

The type UN1-013 Renault 21 Turbo is the preferred transaxle for use in the GT40 replicas although the 25 Turbo and GTA boxes are also often used. Also note that if the GTA box is used it either has to be inverted or the differential reversed unless five reverse gears are required. On all boxes the selector shaft has to be modified to extend out of the right hand side of the gearbox so as to link up with the right hand gear change linkage. The preferred CV joints are from the Ford Granada and adaptors have to be fitted to the Renault transaxle output shafts to couple to these. These adaptors are commercially available items.
The transaxle type can be found on a small aluminium disk around 1-1/4" diameter which is held onto the box by one of the fixing bolts on the rear end cover of the gearbox. Unfortunately if this cover has ever been removed the disk is rarely replaced and the only way to identify the box is by checking the gear ratios.

The Audi suffix 016 transaxle is the preferred transaxle for use in the GT40 replicas. The 016 boxes have the selector shaft on the left hand side, all other boxes have the shaft in line out of the back of the box. The 016 selector shaft has to be modified to extend out of the right hand side of the gearbox so as to link up with the right hand gear change linkage. The CV joints used on most (UK)GT40 replicas are from the Ford Granada and the output shafts on the Audi type 013 transaxle have mountings to suit. The Audi type 016 has output flanges to suit similar but slightly larger diameter CV joints which could be adapted for use with the smaller CV's if necessary or better still to use as standard with larger diameter drive shafts. Note that Audi 200 were later versions of this car and the 9000 range were again the same but the American version of the car.
The standard Ford V6 flywheel commonly used on GT40 replicas will not fit into the bellhousing on this transaxle. A special flywheel or extra thick adaptor plate will have to be used. The standard Audi flywheel would have too many fixing holes making the mounting unsafe if modified for use with the Ford V8.

The following pages hold the results of the general theoretical calculation of wheel and tyre diameter for various combinations. They cover the range 15" - 18" diameter, 70 - 25 aspect ratio and 145 m.m. - 385 m.m. tyre width. The grid has aspect ratio across the top and tyre width down the left hand side. The figures in the body of the grids are wheel diameters in inches.

15" WHEELS