There a 2 different types of F16. One is a wide ration and one is a close ratio. The Astra/Cavalier SRi,SXi came with the close ratio box and the CDi Cavalier/Astra came with the wide ratio.
The wide ratio is not much good for the 16v engine. The close ratio F16 is a good match for the XE engine but isn`t suppost to be as strong as the F20..........
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