Are the DOHC and SOHC 5 Speed transmissions the same?

[nab911]

And there ya go. I have a harness from a dohc transmission, and i have a dohc motor, but will the sohc transmission bolt up to the dohc motor and will the wires connect right?

EDIT: THEY ARE THE SAME BUT BUY A CLUTCH KIT BASED ON THE TRANSMISSION YOUR USING, NOT THE MOTOR!
Modified by nab911 at 5:23 PM 5/23/2005

[USDM240]

yes, the SOHC and DOHC transmission are the same. the only difference that i have been able to find is the vent. the SOHC doesnt have one, but the DOHC does. just swap them out and youll be fine.

[nab911]

Im gonna hold you to this and if i swap them and it doesnt work its your ***

[dal2kvvisp]

wow, you are definately wrong, the sohc transmission WILL NOT fit on the DOHC transmission, we just tried it last night thinking it was the same as well. we took a 5spd out of a 92 because it was really messed up, grinded like 2 gears, didnt go in sometimes etc, and we had a sohc laying around, so we put em up to each other, and they looked the same, so we tried putting it in.

4 hours later, trying everything we knew, still no transmission in the car, so we take it out from under the car, and check it to see if it really IS the same... because it came out easily enough. the sohc transmission looks the same, but ones more oval than the other, sohc and dohc are not interchangable

[silencer.1]

Can't you just swap bell housings?

[Dattebayo]

Yes, all S13 and S14 bellhaousings are interchangable.

And they are supposed to work together, I believe that the SOHC transmission that you tried was damaged in some way, because I have never heard of anyone having any trouble with this interchange.

Please do not assume that because you tried something once and it didnt work that it will be the same for everyone else.

[dal2kvvisp]

well the SOHC transmission came out of my buddys 240 ( just finished an sr swap ) and later, we talked to some people and they recommended swapping the bell housings. Buuuuuuut, problem is, your gonna loose a sensor, and they said we might throw a check engine light... thank god this isnt my 240:)

[nab911]

This is not what i want to hear. I went out the other day after hearing they were the same and bought a sohc transmission. All the sensors and so on hooked up the same so im gonna try the swap this weekend and ill be more that pissed if it doesnt work.

[TheOne]

shouldn't it be the same though? i mean...most of the stuff that changed was in front and above the head, the block is somewhat the same on both ka's.

[jp]

thats crap all the transmission's are the same, dohc sohc it don't matter. or else my transmission swap wouldn't have worked I put a 93 transmission on a 90 sohc

[dal2kvvisp]

ok yeah i made up the missing sensors? we tried the damn thing, and were still working on it, the sohc is missing a sensor, imma try and take a picture of it

[nab911]

Well i just took a dohc harness and plugged everything up fine... Show us a pic or name the sensor...

[Ajax]

Somewhere I got the idea that SOHC trannys had one less synchro than the DOHCs. Maybe the one I test-drove had a bad synchro.I doubt that would change whether they can be swapped anyway.

[nab911]

Lol well tonight im going to try to swap em, if it doesnt work then damnit.... but im gonna try. And ill also let yall know how my 11 lb fidanza flywheel works in the drop top

[Dattebayo]

You might have a little issue with the flywheel, something about having to drill out some pins or what not last time.

But I have it in my S13 and I love the flywheel. I just hope you arent using a stock clutch with it.

[All_Motor_KA]

I just bolted up my transmission to my new twin cam. It fit fine and all sensors hook up. It's in my car now. I havn't finished the swap yet so I can not tell you for sure for sure but everything is hooked upp and several o my friends have done the swap with NO transmission probs.

[nab911]

The pins are in a bag, i think i have to line it up and put them in myself. And i am using a stock clutch because i have stock power and im a broke bastard.

[USDM240]

ok yeah i made up the missing sensors? we tried the damn thing, and were still working on it, the sohc is missing a sensor, imma try and take a picture of it

i wouldnt state something unless it was factual. i work for a local performance shop and do these types of swaps all the time. i also swapped my '89 SOHC for a '91 DOHC and used the SOHC transmission. now how is that that mine worked and yours didnt? i think you may have been doing something wrong. and please, check into these things before posting your assumptions.

[nab911]

My sohc transmission is now on my dohc motor. Im about to go down and do the wiring and when i finish ill come up and tell you that your still wrong

[All_Motor_KA]

Done yet???

...or did you hook up all the plugs and now your driveing???

[nab911]

Lol im done, it works fine. Didnt even use a wiring harness. I have 2 wires running from the speed sensor and i have to run 2 wires to the reverse sensor.

[DriftSpecial180]

So and end result is that a DOHC trans can also work on a SOHC? I've been waiting for a direct answer. buts its been a battle back and forth.

[nab911]

Well i put the sohc trans on my dohc motor and it is perfect. BUT, as far as getting a new clutch kit, buy a clutch kit based on the TRANSMISSION not the motor because i got a de clutch kit and the throw out bearings were different.

[ourru]

I am about to do this swap into my 93 (its an 89 trans), any tips? is it just a direct bolt on? use same bolts and everything same places? thanks!

[nab911]

Everything is the same. Get the 89 clutch kit though. Mine just got all messed up because my brother drove it so im going to nissan tommarow to pull the trans and see exactly what happened. But its only $200 for a new clutch kit and install for me (pays to have friends )

[Dmnitsadean]

nicly done nab 911....dude you still haven't gave any information on your flywheel how is it....tommoor ima get my Exedy Clutch but a Stock rebuild flywheel... well altogether and labor its about 500 alltogether...manh thats for a broke *** guy like mee...but I need it....I wanted to buy a flywheel but I dunt know where and howmuch....can you guys help me.....And Ima still finding the manual for the transmission so that i was thinkin of workin on it myself.....but yeah I dunno no more...but if you guys can help me well plz thanx..... DeAn

[USDM240]

My sohc transmission is now on my dohc motor. Im about to go down and do the wiring and when i finish ill come up and tell you that your still wrong <IMG NAME="icon" SRC="http://images.nicoclub.com/forums/image ... s/wink.gif" BORDER="0">

hehe

hows the car running? i heard that something happened. im hoping that it was just a rumor....

[ourru]

thanks guys, this thread was great! im gunna pick up a trans today for $100, theres also a SOHC motor attached to that trans so ill prob resell that hehe. then pick up a centerforce stage 1 to use w/ the stock flywheel. ill let yall know how it goes!

[nab911]

Get the fidanza.. even before when my clutch was messed up... everyone who rode in it was amazed. It frees up at least 10 hp. I can spin clear through first and into second in the dry (one tire fire) but the car moves and flows sooo much better.