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Thread: F23 gearbox ratios

  
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    F23 gearbox ratios

    Hi all, just need a bit of advise

    there are two types of F23 gear box listed for a x20xev astra mk4

    first has a ratio of 3.95

    seconed has a ratio of 3.74

    what are the beifits of either box? which is the better for a v6?
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    you want one that has come out of the following cars:

    astra sri turbo mk4

    astra Gsi mk4

    astra turbo coupe

    zafira Gsi

    Late astra 2.0 Sri mk4
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    Here is the list of gear F23 gear boxes in the astra range

    From EPC

    Gearbox ---- Engine/model -------- Final Ratio

    F23SC X20XEV 3.95
    F23TS X20XER 3.95
    F23SH X20XEV 3.74
    F23SD X20XEV 5Dr hatch 4.17
    F23TR Z20LET coupe 3.63
    F23DZ Z20LET Zaffira 3.95
    F23SF Z22SE ALL (not Zaf) 3.95
    F23SG Z22SE Zaffira 4.17
    F23SB Y20DTH ALL (not Zaf) 3.63
    F23SA X20DTL ALL (not Zaf) 3.84
    F23SJ X20DTL/Y20DTH Zaffira 4.17

    You will need the TR for the best ratio.
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    cheers matG

    from what jon was saying he said go for the F23 from a N/A 2lt sri
    Im not totaly clued up but i take it the ratios only really effect the top speed etc? :?
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    The turbo coupe has an f23 which has longer ratios for the extra top end. I think it is the f23srt for the turbo and for the diesel turbo they use the f23sr, sr (standard ratio, standard ratio turbo). I guess it would make sense to use the turbo's box.
    Astra Turbo Coupe

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    Quote Originally Posted by JonS
    I guess it would make sense to use the turbo's box.
    Also the Turbo box will have a much stronger Diff and bearings to cope with the extra power the engines gave them!! Should last much longer than a standard one with less power.

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    Jon may of said go for the N/A F23 because it will be the easiest to get hold of, he knows what I have been throught to get mine.
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