Z31 half shaft on a 240z 1971

[jeanp]

I am converting my rear end.

After a few problem's with a VLSD R200 that was not fitting my Z31 halt shaft.

Not same number of splines. Had my CLSD R200 rebuilt with the VLSD gears.

Started remounting the back of the car and got into another headache.

I have R200 with T3 lower arm's and Z31 half shaft.

Chequered flag racing Stub axle and Companion flange.

when i measure the distance between upper and lower bushing from originale lower arm

i got 14 1/2 inches (center to center)

For my Z31 to be at middle travel i need 15 1/2 inches right side

and 15 3/4 left side. that is with no weight on the suspenssion.

It looks like i have about 1 inche of travel on the half shaft so were shoud i start my

allignement?

Should i cut the half shaft's to be closer to the 14 1/2 ?

Look like my tires are going to be a bit off body at 1 or 1 1/4 inch further out.

Any advise

Thank's

[Zed Head]

Problems like yours are common on Hybridz.com, have you been over there? - Drivetrain - HybridZ

You will take some heat though, for swapping a CLSD for a VLSD, if you post a question on Hybridz.

You could have run the stock u-joint half-shafts with the CLSD, using 280Z companion flanges in the diff, although there might have been some binding at certain points of the suspension travel. - Beta Motorsports, LLC Bench Racing

[jeanp]

Actually I had 2 goals in my mod.

I was running a CLSD R200 that was noisy and had suffer from overheat. I needed to replce it

I was tired of changing U joints

So i found this nice VLSD on E-Bay and Z31 half shaft

These shaft were sheaper then a set of Ujoint.

Found modern motorsport stuf nerer could order them so

found chequered flag racing axle and companion flange

Then i found those nice adjustable lower arms at T3

When i went to rebuild the car i did put the Z31 in the VLSD oups not same spline

So i did a swap kept everything from the VLSD except the diff itselfe wich i took from my CLSD

so i got a CLSD with new gears berings housing and adjustment freshly done. And also if i

would not have done the swap i would not have notice that the ring gear was mounted with

to small bolts and everything would have break if i would have put power on it.

But almost everywhere you will see that Z31 halfshafts are direct fit the thing is they are longer.

So i wonder is there any place i can find info on lenght of the lower arms for this fit and I hope not

to cut my rear fenders.

[Zed Head]

The length of the CV shafts for the conversion has been discussed to death (death of the stock CV shafts) on Hybridz.com. One of the guys who determined that the stock Z31 turbo shafts were too long, and made up a bunch of shafts to the correct length, just posted in another thread in this forum.

Edit - in short, what I'm saying is that I think that you can find all of the answers on the Hybridz.com site. The adjustable control arms are discussed, the bushings for the different ring gear bolt sizes (10 or 12 mm), and the lengths of the axles. There's also information on avoiding certain CV shafts because they are way too long (I can't remember which ones right now). The shafts that would probably work for you, with the T3 arms adjusted wider, are the 4 bolt Z31 turbo axles. I think that the Z31 VLSD axles are too long, longer than the Z31 4 volt CLSD axles, that might be where your problem is.

The information is spread around though so it will take some searching and reading.

Edited March 29, 2013 by Zed Head

[jeanp]

The length of the CV shafts for the conversion has been discussed to death (death of the stock CV shafts) on Hybridz.com. One of the guys who determined that the stock Z31 turbo shafts were too long, and made up a bunch of shafts to the correct length, just posted in another thread in this forum.

Edit - in short, what I'm saying is that I think that you can find all of the answers on the Hybridz.com site. The adjustable control arms are discussed, the bushings for the different ring gear bolt sizes (10 or 12 mm), and the lengths of the axles. There's also information on avoiding certain CV shafts because they are way too long (I can't remember which ones right now). The shafts that would probably work for you, with the T3 arms adjusted wider, are the 4 bolt Z31 turbo axles. I think that the Z31 VLSD axles are too long, longer than the Z31 4 volt CLSD axles, that might be where your problem is.

The information is spread around though so it will take some searching and reading.

Thank you for these valuable infos

I will do some reading on hybrid Z

Note i also read on hybrid Z that the travel on standard 240Z half shaft is about 2" 3/8 witch is much longer travel then what you will get

from CV shafts

Regards

Jean-P

[jeanp]

For anyone who read this, I called the guy that sold me those CV halfshafts cause they are exac same lenght from

flange to flange so lenght from diff to companion flange are exact same. but yokes are 1/4 inch different.

I dont know how this fits on a 300zxturbo but i know it cannot be direct fit on S30 as some would say here and there on

the internet and swithching left to right will do nothing. only that the clip in the diff will be 1/4 inch to far to hold the yoke in place.

So i am now in the process of having custom shatf made for those CV's.

Z mod is a journey sometimes cost a little more then anticipated.

[jeanp]

Just to post info on that journey, I ran the car with 4degrees of camber for a summer i could not push the wheels in shaft  where to long (even if a reversed the knee).

Then i decided to have them rebuild so they fit by datsunspirit.com but the guy told me they are already modified (knees were reversed i know i did it myself) so i bought some new shaft from Chekered flag racing and send them to him then when he came to me and told me both shaft where same lenght so that is why i had this problem.

So now i have to long unusable shaft. and a very good working set of  expensive Z31 CV .