[viken69]

I removed my driveshaft on my 89 grad to replace the bearing and center mount only to find out that the #15 nut in the diagram below is completly stripped. So now I need to rethread the threads on the driveshaft and find a replacement nut. Does anyone out there know what size the nut is?
Has anyone ever been thru this?

 

[viken69]

Heres a pic of the thread on the shaft. I wonder if i would be able to just bolt on a nut without rethreading? it doesnt look that bad.
But the inside of the nut is slick, no threads left at all, although its kinda hard to tell on the pic.
Oh and i thought i'd throw in a pic of my poor car jacked up on all fours

 

[bianchi2]

i still have the front part of the driveshaft here at home ( 84 model year) not useing the alfa driveshaft(s) anymore, useing a 1 peice alumiumn driveshaft now.

 

[jcslocum]

The thread on the drive shaft looks ok (from the pic). I would call one of the Alfa breakers and see if they have a good nut to sell you. You do not want that sumbitch coming off at speed!

 

[viken69]

Jon, that was a great suggestion, I was ready to take the driveshaft to a machine shop to get it rethreaded. Instead I took it to enginetrics in Nevada Tx (about 20 minutes from me). After taking a look at my driveshaft, The guy there showed me that the main problem wasnt the threading, but rather was on the other side of the shaft, where it connects to the gearbox, it was all worn out of shape. He sold me another shaft for cheap (cheaper then rethreading).
I installed it, its great, no more vibrations, very smooth. I'm a happy camper

 

[PAUGNUT1275]

Driveshaft wear

Hi
Just be aware, that if the cup on the forward end of the old driveshaft was badly worn, that the output shaft of the trans may be badly worn also.
If the vibration comes back over time, the trans output shaft will need work.
KG

 

[jcslocum]

Jon, that was a great suggestion, I was ready to take the driveshaft to a machine shop to get it rethreaded. Instead I took it to enginetrics in Nevada Tx (about 20 minutes from me). After taking a look at my driveshaft, The guy there showed me that the main problem wasnt the threading, but rather was on the other side of the shaft, where it connects to the gearbox, it was all worn out of shape. He sold me another shaft for cheap (cheaper then rethreading).
I installed it, its great, no more vibrations, very smooth. I'm a happy camper

Some days it all comes together!!! Good for you and enjoy the vibration free ride.

 

[viken69]

KG, I'm hoping I caught it in time. The drive on the gear box had one side a bit more polished then the rest, but overall no wear.