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#3
24-01-2007, 23:27
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Would an ca s13 gearbox fit my mk1 s12 if i use my mk1 bellhousing?Or are the propshafts or selectors in different positions, I need to know weather to keep it as a spare or not
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#4
25-01-2007, 07:48
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the s13 boxes are the same design but different length (longer) than a mk2 silvia box, the mk1 box is a lot different and a slightly different length too. Changing to and s13 box does mean a wider range of boxes available and possibility of a close ratio version if you use the s14 box with the s13 bell housing. Im 90% sure that the mk2 silvia box bellhousing is teh same as the s13 tho.
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 Racing is life. Everything else, before and after, is just waiting. - Steve McQueen
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#5
25-01-2007, 09:33
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Did you have to change the length of the prop when using the S14 box, and was the shift in the same place? Was the gearbox mount transferrable?
I'm thinking of trying to find an S14 box. I already have 2 S12's and an S13 box, but if the prop length is the same as S14 then i'll use the S13 box till a decent S14 box comes up.
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#6
25-01-2007, 10:05
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my car had an S12 mk2 box originally fitted. after breaking a couple i bought an s13 and s14 box. the s13 box, and s14box when fitted with the s13 CA bellhousing, are 50mm longer overall (in the tailhousing section actually), than teh S12 Mk2 boxes. it required the prop shortening by 50mm, but the gearbox mounting points on the box are in the same place and take the same mount as the Mk2 so its only the prop that you need to get shortened (cost me £40 inc balancing iirc).
the gearlever position is moved back 65mm though so the tunnel will need modifying too. S14 ratios are better for my car anyway, and the latest s14 box i have has the anti surge trapdoor design too to stop the oil rushing away from the gearset asnd filling the tailshaft section.
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Racing is life. Everything else, before and after, is just waiting. - Steve McQueen
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#7
25-01-2007, 10:11
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Is there a difference in length to the S13 box and an S14/13 bellhousing combo?
ie, if I fit the S13 box will I need the prop shortened when I eventually get an S14/13 combo? Have you considered going for an os giken gearset?
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