Steel to alloy control arm conversion: stub axles?
 

See my post under a very poor topic heading here:

http://forums.pelicanparts.com/porsche-911-technical-forum/156726-rear-hub-wont-fit-grrrrrrr.html


Im guessing I need to use different stub axles. No idea which ones. It would seem there are dozens of different types out there.....

Does anyone know what stub axles will actually work properly with what control arms / half shafts / hubs ?

My car is a '69 911S. It has alloy control arms. I am not sure what year the arms are from, but they have the ball type fitting for the anti-roll bar link. Attempts to use the stock half shafts and stub axles with the stock hubs apparently are a failure.

Do I need to just go ahead and buy complete new half shafts with CV joints and stub axles and matching hubs? IF so, from what year car? Will this also require removing the engine/trans again to take the trans. apart and replace the output shafts and flanges? Im guessing lots of custom machine shop work will also be required.... anyone know exactly what or will it be trial and error (ie. totally assemble and then disassemble entire rear of car multiple times before getting it right) ?

I can get the part numbers off the alloy control arms I have if anyone has any clue where I can find out what year they are from and if this info is of any help in figuring out what parts will work on my car with these arms.

Thanks for the help..... sorry for my frustration. If I had a gun in the shop this car would have been shot by now.


Terry

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Hi Terry, I suppose misery does truly seek company. I have a 69E that I made as a 73 RSR clone. I installed alloy trailings arms as well and ran into a similar problem with the hub. The 69 hub will not seat properly. I purchased the alloy arms only, no hubs or stubs and I have no idea what year they are from. They do appear to be brothers however. As I could find no knowledge base as to what the proper hubs were I bought new hubs from Brumos. (That was a severe hit to my beer money). In looking at the new hubs vs the old 69 hubs I found they are the same height but the difference is the new hub's bearing surface is wider. It is machined higher into the flange. There are three "ears" on the hub where the nut goes, I suppose to put the stiffness back in the hub. I noted the machined surface of the 69 hub matches the width of the 69 style bearing and the new hub matches the width of the larger bearings as required for the alloy arms. The 69 stub axles will work fine. The splines mate up exactly. The shocks will not work as the eye is too small and the shock tube hits the arm. You will need the M14 bolts as well. The 69 used M12 with nuts, the alloy arms I have use a M14 that goes into a pressed-in tap. My car is still up on stands as I left before finishing it. I am out of the country for another two weeks so I cannot get you the part numbers. Ed Harvey at Brumos could get them for you. I am not an engineer but it appears you could chuck up the 69 hubs in a lathe and machine them to fit but I do not know if the hub is strong enough for that. Someone else may know or they may have done so. Good luck with you project. I love my old 69. If I ever fall on bad time it stays, the rest can go.

Hey! Thanks for the help!

Now were getting somewhere.

See my other post for some details on current status, but I had just come to the conclusion that I needed different hubs. I also figured I needed different stub axles and complete half shafts plus probably trans output shafts. Looks like MAYBE it wont be that bad.

Any idea on a part number for the correct hub? What year or model hub did you purchase new? My control arm part numbers are:

L - 911331513OR
R - 911331514OR


Thanks for the help!


Terry

There are only two numbers, left and right, for the arms (except for 930 tubos which use different arms); the numbers are 911.331.513.00 for left and 911.331.514.00 for right. There was only one hub style used for 911 and 911S in the 74-77 years (again except for the turbo which used a different hub); that number is in the other thread but here it is again: 911.331.065.33. New hubs are very expensive so you may want to look around for a used pair (Parts Heaven in Hayward, CA)? Jim

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Mucho Gracias!

Dunno why it didnt dawn on me the stub axle part numbers are the same all through this period..... Ive got it straight now, will try to find some hubs.

Thanks again!


Terry

Terry;
I made the same update on my '69E and ran into similar problems. I've documented how I fixed the problems on this thread. BTW, I got my used parts from Foreign Intregue in Maine. Their web site is OK, but their phone support was great.

Let me know if you have any other questions.

John,


I read the details on your conversion in that post. Something sure seems strange.

According to the part numbers, there is only one Hub '74 to '77. I have also been told that if I use those hubs, I should be fine with my stock stub axles and half shafts and all.

You, Me and Dpatterson all converted '69 model cars. You had to replace the hub, stub axle, entire drive shaft with CVs and the trans. output shaft. Dpatterson only needed to replace the hubs.

So... I guess the answer to "what is required to convert a '69 model to Alloy control arms given your using '74 to '77 model alloy arms is: it depends. Exactly what it depends on I do not know.

I am going to get some of the later model hubs and attempt to stay with my stock axle assemblies. If (?when?) this does not work, I will buy complete new axles and output flanges and all the hardware.


Terry

Terry, please excuse my late reply. I do not know the part numbers and I am in Aruba for another two weeks. I can have my friend that watches my cars while I am gone email me the numbers and I shall forward them to you.

the rear wheel hub for epoattersons conversion is 911 331 065 33