ca gearbox ratios

[CNHSS1]

mk2 s12 and s13 are identical box ratios (in the uk anyway). S14 box can be used to replace any car using an s13 box if the S13 CA style belhousing is used rather than the s14 SR type. Straight swap, 20 mins for the bell housings.
As Martin said, s13/14 ratios are on the downloads, but essentially the s14 box gives longer 1st and 2nd, almost the same 3rd, identical 4th (1:1) and slightly shorter 5th. Its essemtially a 'close' ratio version of the S12 mk2/s13 boxes. There are afew variants of each of the boxes. I have had 2 different s12 mk2 boxes, 3 different s13 boxes and 2 different s14 boxes, but they are detail changes and only some parts are interchangable.
Ultimate box design is the last s14 boxes which have a 'trapdoor' design (similar to winged anti surge engine sump pans) on the centre steel bearing carrier that stops oil starvation to the bearings and gears on hard accelertaion and G loads.

[alundra]

I found a excel that mention 200 SX se 1987, the 5Th ratio is different that on mk2 ratios said before:

1st 3.321
2nd 1.902
3rd 1.308
4th 1.000
5th 0.838 instead of 5th 0.759:1

Final gear ratio 4.111

Perhaps it's an american difference.

http://www.mediafire.com/?8ctjqadnujd

What do you think about it?

[30psi]

The final ratio is in the rear diff. Changing this would have the best effect.

Manual - 3.7
Auto - 3.9
FJ20 - 4.11

[alundra]

3.9? Are you sure? i mean all sources tell 4.11 and 4.111 on R200 Ca18et

[30psi]

Manual CA18ET is 3.7

Auto CA18ET is 3.9

FJ20 is 4.111

Maybe the Euro 8 spark cars had different diffs

[PukkaSilvia]

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

[CNHSS1]

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.