Can you help? Driveshaft Question....


Newbie to the group here - we have already found tons of invaluable information on the board, so thanks! We are restoring a 1963 Series 62 Convertible. We are wondering if anyone knows of a source to buy the propellor yoke flange (that bolts to the pinion flange) for the driveshaft? One of our ears partially broke off. Not sure if we can buy just the yoke flange as an aftermarket part, or if it has to be rebuilt by a welder/fab guy? Maybe a salvage yard for a source? Again, any help would be appreciated! I have attached a pic of the part that is broken for reference (highlighted in red). Thank you in advance!!!!

Chris & Andy

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Comment by Jason Edge on May 30, 2021 at 6:57pm

Chris, I am going to guess that corner didn't just break off from normal torque stress and instead struck something either on or off the car?   These are pretty thick metal and you have Four Grade 8  7/16" diameter bolts securing the flange ends together. 

The problem in finding that part may be that there is a super high demand for those rear sections as the CV joints wear out and cause vibration and it's not like there are many just laying around for parts. I have a long back log of customers on my Wait List looking for VG tight rear sections but I do sometimes get loose ones in that are good cores for rebuild or to use for donor parts to rebuild your rear driveshaft section. Rebuilding the rear driveshaft section, from at least what I have observed over the last 25 years, is a crapshoot unless you are 100% sure the company/person can do it right. I've sold nice tight rear ends to customers that have spend over $1000 to have their driveshaft rebuild several times, only to continue to vibrate. 
So, I think your options are as follows:

1 - find another VG rear section to swap in

2 - find a donor rear section to either rebuild or use the rear flange for yours for rebuilding

3 - put a thick washer behind the bolt, bolt it up and go! 

Without knowing the history of how this happened or the condition of your rear driveshaft section (is it nice and tight with no vibration or loosey goosey and needs to be rebuilt anyway) but personally if it was a good rear driveshaft section otherwise I would find a thick 7/16"  washer (I've got some in my stash), and use it behind the lock washer to better distribute torque from the bolt head to the flange. The bolt is 1" long so you should still have plenty of bolt penetration to securely hold. You have 3 other beefy Grade 8 bolts that help keep it tight against the pinion flange and my bet would be that it would hold up as long as you drive the car. 
Of course if you need to rebuild the rear section anyway AND CAN FIND THAT REAR FLANGE, then it is a no brainer to go ahead and fix it. I am just thinking through the fact you might not be able to readily find that piece.


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