The girlfriend (a.k.a Datsunny80) and I undertook a manual conversion amongst other thing on her B310. The car is an A12 powered factory Auto and we collected all the goods for the conversion, most of the stuff coming from a wrecker's 120Y.

Now we have a problem that the manual tailshaft, which is noticably thicker has a larger diameter hole pattern on the yoke for the diff side, meaning it won't bolt onto the Auto diff. The thing is the tailshaft is also from the 120Y which I was under the impression was the same running gear as the Sunny.

Does this mean that they run a different diff on the manuals and if so, does anyone know of a tailshaft that will match the Jap end "Auto" diff with a 120Y 4-speed? It's just that we got the tailshaft for free and it'll cost $150 to get a hybrid tailshaft made (yoke swap). We can get ny tailshaft swapped for us at no cost from the wrecker.

Forgive me I'm new to all of this, first Datsun, first RWD car I've dealt with.

It's likely that the Aussie model 120Y had a BorgWarner diff in it. The JDM H150 diff that you have in the Sunny won't bolt up to the 120Y drive shaft. Best option is to get a manual drive shaft out of a Sunny. If that is not possible then it's a good chance the manual shafts for the 1200's 145 diff may fit. Maybe someone else can clarify that?

I had the same problem . I just did what you said you didn't want to do. But I'm fortunate enough that I'm a mechanic sos I did the yoke swap myself

so to digress from the topic, if doing the borgwarner into a 1200, will the 120y tailshaft be the right length for the 1200 from the 120Y?

the 120y could have had a h145 as well.the 120y had a smaller flange than the sunny.the
easiest thing to do is get a sunny manual tailshaft,but you could mix & match if you can find the same size rear yoke.try under some of the other datsuns at the wreckers.then change the rear yoke over.unfortuneately the sunny's universal joints are peened in,so you can just use the original rear yoke,unless you can get someone to machine out the uni joint.try to find a borg warnered stanza,i think these are the same size.

Yes, just get a B310 manual tailshaft. It should bolt right in.

Yes, the auto vs. manual driveshaft is different.Quote:The EGI models used a two-piece shaft with center bearing, similar to the longbed GB122.

The 1971-1973 Datsun 1200 manual tailshaft is the same overall length as the B310 manual but with different bolting in back. Both should use the "Japanese" differential (H145 or H150). But take careful measurements and double-check before you buy. Nissan changed specs several times. you want to get one where you can change the back flange.

B110 and B210 use same driveshaft (except for the Aussie-built 120Y models).

I thought I heard the B210 Coupes in Australia came from Japan, so if correct they should also work with a flange change.



tailshaft comparo

Excellent. Thank you very much fellas.

Thank you again to all who helped out. With a bit of luck today we returned to the wrecker in question and actually found a tailshaft that does match!

The length and width of the shaft was that of the 120Y manual shaft but the flang on the diff side was precisely that of the auto. Upon cleaning the shaft we found the words "Dat Sunny" written on there indicating that it was indeed directly from a Sunny.

Saved ourselves $150.

Glad to hear a success!

Another Datsun will soon be back on the road

Thanks for your kind words oh great one. :)

It seems that we may have been mistaken. The tailshaft seems too long, but only by a small amount (~1 inch at the most).

This only became apparent as we tried to install it, it was a little tight. However it did go on and this issue only cropped up once we tried to drive it. The problem is that the little cup on the gearbox oil seal is grinding against the "stopper" on the tailshaft, in fact it begain lathing itself quite nicely. The car also shudders from this so we concluded that it's too tight.

My question is, how much free space should be allowed for it to move? It seems we may just have to get the tailshaft shortened.

I find it really dodgy that only this 1 - 2 cm difference needs modification. I'd much rather move the engine forward but I won't.