Experts on rear stub axles help please!!

TdiRacing · 03-15-2011, 03:21 PM

I am in need of some technical help regarding rear stub axles and the differences and styles.

What i am trying to do is use 911 SC(supposedly) rear stub axles in my 914 rear trailing arms with the VW hubs which are fine spine. I am told that some SC stub axles have the fine spine, but no one can tell me what year or if it is true?

Why I want to do it so get the 100mm flange so I can use the stronger larger VW bus 100mm CV joint which fit right on my stock 914 axle shafts.

So does anyone know what rear 911 (SC or other) stub axles may have this fine spline?

914 Spline is fine and has 37 splines (uses 90mm CV joint 4 8mm bolts 2 pins)

SC stub axle I have has 28 spines coarse spline (uses 100mm cv joint and 6 8mm bolts)

Pictures for reference:
comparision 914 vs SC

SC inside view

Any help is much appreciated. It has been done, but I am not exactly sure of which parts were used.

group911@aol.co · 03-15-2011, 03:42 PM

I think the inner stubs are either fine or coarse. I think the outers only came one way. Might want to post on the 914 board

djpateman · 03-15-2011, 03:52 PM

Do a search on 914World.com. There are a number of threads on conversion.
The basic thing is the transmission hub has to be coarse spline IIRC.
The 914/4 stub axle and hub are a mating pair; and I think you are stuck there.
Use the 911 5 bolt hub with larger CV type stub axles.

Joe Bob · Joe Bob's Garage

An SC stub axle will not fit either a 914 or an original 914/6. Otto's has some custom stuff and Eric at PMBPerformance.com can do most anything if you have a high HP install. Custom ends to adapters where you can use SC CVs in that type of install.

TdiRacing · 04:38 PM

I think i have been confused by what I was told. I think all i need is the SC rear hubs.

Then use the SC stub axles, 100mm bus CV joints both sides, and weld up machine and redrill transmission output flanges fro 100mm.

I am not sure if the 914 and SC rear hubs are the same dimensionally, but I guess if it is close, could shim the brakes to fit. Running 84 Carrera rear disks and calipers anyway.

Question: Are the SC and early 911 rear hubs the same in the bearing flange area? Do they use the same Bearing? I know the early 911 rear hubs bolt right into the 914 rear bearings and trailing arms on the 914/4.

Thanks

TdiRacing · 05:22 PM

From tech article here on site:

"914-6 hub is the same one used on 1969-1973 911s (part number 901.331.065.09). The 914-6 used 28-spline hubs and stub axles; 914-4s used a 37-spline configuration."

I want to assume that the 69-73 rear hubs will accept the SC stub axles as they are also 28 spline. This would solve all my issues as I know for a fact that these hubs fit the 914 bearing and trailing arm.

Questions: again...sorry

Do the SC stub axles fit into early 69-73 911 hubs? Both are supposed to be 28 Spline????

Joe Bob · Joe Bob's Garage

Good luck finding them. I somehow lost a stub axle. Had to order a custom one from Otto's.

TdiRacing · 03-15-2011, 05:47 PM

I just need to find the correct mating parts...ie hubs that fit the 914 bearing and that the SC stub axles fit into. I know it works, just not sure what years and stuff...

Goal is easy to find replacement parts that are stronger. The VW BUS CV joints are very strong, relatively cheap and they fit the 914 axles without any modifications and are 10mm larger.

Wish someone in around me had some of this stuff to look at and test...???

TdiRacing · 03-16-2011, 07:18 PM

Update: First off I was wrong as to my 914 Hubs being compatible with the 911 Spline stub axles. My friends were laughing because they thought I had the 911 or 914/6 original hubs in back, so yes, then the stub axles would have fit right in. There was some confusion and it seems clear now that all i need is some 69-up 911 rear hubs to fit in my trailing arms. Then I can use the SC stub axles and make the stronger axles i need using the 100mm VW BUS cv joints.