Nadella update questions

[chickybok]

Hi

After chatting to Alan (UK - We are both based over here!) I've been interested in getting my hands on a 5 speed box. I have searched the site but We both thought this would be a good question (s):

Should I update the Nadella half shafts to Löbro? What's the pros and cons? and is it as easy as a straight swap? just bolt in? My Nadellas are fine so should I just stick with them

I don't know what year the 5 speed box is.....Alan? Would any 912 box work with the early Nadellas?

As I've informed Alan... My engines near completion - I'll post some pics soon - Don't you just love the look of Shastas!

Getting very excited

Chickybok
66 912

[Alan.UK]

Hi all,

Does anyone know if the drive shafts are interchangable ?

Also if anyone has done this and they have any advice, it would be much appreciated.

Also, Chickybok, we look forward to seeing those pics of the engine. I've read whats being done and boy this thing is sweeeeeett. As soon as it's done I think it needs a nice country drive down to Bournemouth_grin

Regards to all

Alan.UK (Bournemouth)

[chickybok]

Alan - As soon as I 'shoehorn' the engine in you'll first to know! I be straight down to sunny (well, sunny for us Brits) Poole/Bournemouth for the weekend.

Sorting out the engine bay / sound proofing and Ball Joints this long weekend (we get a four day weekend due to the Queen's jubilee!)

Chickybok

[Efrain68912]

Any 901 5-speed will work, but I'm not sure about using those Nadellas. I think the output flange for the Nadellas are different.

And yes, Shastas are pretty.

[Rick Becker]

My '66 912 has Nadellas. They were used on '65 and '66 911s and 912s. The output flanges on the Nadellas are different, with a keyway and different bolting pattern.

Some advantages of Nadellas are:
1) They can withstand high amounts of torque. They were used on the 904 and 906 racecars.
2) The joints are sealed.
3) If you're a concours person, maybe you can score extra points for originallity.

Some disadvantages of Nadellas are:
1) They are not constant velocity.
2) The lower joint is exposed to the weather, has no dust boot, and once it starts to wear out the Nadella will need to be removed and the joint replaced at a machine shop.
3) The integral mechanism to allow axial movement is not symmetric, so when extended they are not balanced, creating extra vibrations.

So if you drive your 912 for street use, and have Nadellas in good condition, you could find a 5-speed '65-'66 transaxle and be done. For a later transaxle or one that had been modified, you would have to take your old Nadella output flanges and install them on the 5-speed transaxle.

To install a later transaxle with output flanges for CV joints, you can convert to CVs, but you'll need to assembly all the bits and pieces. CVs, half-shaft, and splined shaft to the wheels.

I changed from a 4-speed to a 5-speed in my '68 912 Targa, an easy choice since it already had CVs. I like this combination much better; smoother, and easier to climb grades. But I've kept my '66 original; it needed a rebuilt Nadella for the driver's side; I didn't opt to spend the extra $$$.

New Nadellas have not been available for many years, and Nadellas with the joints in good condition are valuable, so if you decide to upgrade, don't discard the Nadellas, sell them to another '65-'66 owner, or a 904 or 906 racer!

[mein12]

Hi Guys,

My differential is from a 904 racecar which, as Rick mentioned, used nadellas.
I machined the nadella hubs to accept my original 68' CV hubs. My old CV hubs were also machined to mate internally. The two were pressed together and welded. They work very well and have been in operation for 8 years with no problems. This can be done with early or late CV's. Early small, Late 69' large pattern.
Basically, you end up with a half nadella, half cv hub. I hope the picture works out.
Good Luck, JMB

[mein12]

Darn,

I just remembered that I have 901 cv diffs lying all over the garage. This and a pair hubs would also solve your problem. Just drop me a line if you want some help.
Later, JMB