s13 tranny in an s12 = success

[s12_200zx]

im sure it will bolt to the engine, the chassis is a different story

This whole process started at the salvage yard. Initially, i had a weird looking
71b manual trans which looked smaller that the 71c from my s12, yet same length.

So i took that tranny back, and pulled the tranny off the pathfinder.
That pathfinder tranny looks shorter...
Will measure tommorrow.

[s12_200zx]

This whole process started at the salvage yard. Initially, i had a weird looking
71b manual trans which looked smaller that the 71c from my s12, yet same length.

So i took that tranny back, and pulled the tranny off the pathfinder.
That pathfinder tranny looks shorter...
Will measure tommorrow.

So the measure is 31 inches from one end to the other.

[SomeoneWhoIsntMe]

How I rigged it in my car.... CA18DET with it's factory long C-trans.

Custom $7 motor mounts



Custom $5 trans mount



Shifter comes out here, the handbrake will have to be shortened or moved.



The stock B-trans driveshaft fits in the C-trans, the front half just needs to be shortened. By how much, I'm not entirely sure. Doing it this way would save you from sourcing a mk2 rear driveshaft, s13 front driveshaft, and mk2 trans mount if you're working with a mk1.

[Jay]

Holy freaking necrothread

[SomeoneWhoIsntMe]

It's stuck isn't it? it's not like it isn't already on the top of the first page anyway.

This thread is supposed to have useful info about swapping a long C trans into the s12. The only thing that has been established in it is that if you have a mk2 that already has a short C trans in it, you can do this swap. For a mk1, the process remains unclear.

When I started doing my swap, I thought I was going to need to find a mk2 trans mount and mk2 driveshaft. S12's are impossible to find in junkyards around here, and I don't even know what it would have cost to locate an out of state yard with a mk2 in it, have them pull the driveshaft, and ship it to me. Not to mention the fact that a new rubber mount costs $60 to replace the rubber mount on the S12 mk2 crossmember, which may or may not even work correctly based on

i tried to install a mk2 mount on my mk1 and it didnt line up with the hybrid ka swap trans neither did the mk1 mount so i had to run top half and bottem

That the B trans and C trans use the same output splines is news to me, and it means that all I have to do is have my driveshaft shortened and rebalanced and my drivetrain will be complete. No matter what mounts you wind up using, that info alone is worthwhile to anyone swapping a mk1, since buying both a mk2 and s13 shaft, then throwing away your stock shaft, half the mk2 shaft, and half the s13 shaft is at best a huge waste of time, and more than likely a huge waste of money.

[Arro]

It isn't unclear, you just need to search, because I have an S13/14 trans in an Mark I ATX car, and have had a Mark I MTX car with one, too. I have pics of both mounts in both build threads, and both threads have link to each other because both cars shared the same motor/trans.

[nismo_200sx]

i took apart a 180sx ca18det jdm tranny case and swapped the s13 internals into a s12 c tranny case and it works completely fine! either or you want to do i used the s12 rear bellhousing and the s13 front bellhousing to complete the case even if you use all s12 c trans case it will still work being that the c tranny and 180sx tranny are interchangeable onto the jdm ca18det just the rear lengths for shifter and driveshaft are different.

[Wonderingraven]

So the question i have, I have an s13 tranny with an mk2 SE. Will the automatic transmount usable ?
or do I have to do the metal bar?

[s12_200zx]

Not sure why you couldnt have done it before? if it was a MkII C Box.

BTW if you want a replacement "short" Cbox like the stock s12 . . . look under a hardbody pickup.

Dont forget the first and second gen  Pathfinder C trans. Its basically a zx transmission. All you will need is a custom drive shaft.

[Wonderingraven]

Noticed a few questions lately about a VG30E mated with a 240sx (s13) They do fit as I run one in mine.
Just need a VG30E bell housing to match it.

For some information, check out a few (including my build) threads

http://www.az-zbum.com/information.transmission.shtml

The second strongest Z31 manual transmission is the FS5W71C found in any 5 speed non turbo Z31. This transmission is internally the same as the transmission used in the 240SX, 180SX, Silvia, etc. A few people who have blown up their FS5R90As have swapped to the Z31's FS5W71C transmission and not had problems. A lot of 240SX owners have the 240SX version of this transmission mated to their SR20DETs and KA24DETs running 400+ hp with no problems. Any short throw shifter made for the 240SX (S12, S13, S14, S15) will fit perfectly in this transmission.

As also confirmed the z31 / 240sx FS5W71C (C Trans) is the same length as stated in the s12 using s13's you need to cut the sifter hole just a tad.