Ford T9 5-Speed Semi-close ratio
This transmission is similar to those used in the Caterham's except it has a short input shaft - about 1" shorter than the version used with the Caterham's. My unit was rebuilt using Ford internals that result in semi-close ratio gears without resorting to straight cut (noisy) gears. Here are the ratios of the stock Ford Sierra/XR4Ti, my semi-close ratio unit and the Quaife close ration transmission. BTW, my transmission is less than 1/2 the price of the Quaife and I get to deal with a Woody at Birkin Sport in Vacaville CA (a big plus with anything on the Birkin):
Stock Semi Quaife
1st 3.65 2.83 2.39
2nd 1.97 1.81 1.54
3rd 1.37 1.25 1.21
4th 1.00 1.00 1.00
5th 0.82 0.82 0.91

Final drive ration is 4:10 to 1. I have a Quaife LSD unit, but it has not yet been installed (just lazy I guess).


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