Easy 5-Lug Conversion - 911 Running Gear, For High Power Applications... Options

[thenewgarage]

I have a few questions in regards to building this axle set up. These will be installed into a 1970 914-6.

I thought I had the correct donor axles in storage and began taking them apart. I was excited to get all messy so I took them apart before measuring... turns out they measure to 110 - so they are from a 74 or so 911. Am I correct in assuming these will not work on a 914 - issues with the trailing arms, etc.?

At some point in this thread a few people suggested to buy a new 108 axle set up for a pre-74 911 with CV's installed - press off the CV's and install them on the correct length axles - I will be running the Sway Away 20.25" axles

In other words...

Buy a new set of 911 108mm axles with CV's...

http://www.pmbperformance.com/catalog/item...068/7781410.htm

Take the hardware off and install them on the Sway Away

https://swayaway.com/product/axle-set-porsc...long-28-spline/

Then source the correct 108 mm Stub Axles and Trans Flanges.

So...how does my logic sound here? Sometimes it can be off so your advice is appreciated!

Thanks!

[Steve]

Looks good to me. You might want to call up PMB and ask. Those cv's according to the pictures have the two pins for the early flanges and stub axles. My car is a hodgepodge. I'm running an 86 915 trans with late model 108mm flanges that don't use pins. On the outside I'm running 108mm 1973 911 stub axles and cv'S. Using the swayaway axles. It would of been nice to use more modern cv's on the outside.

[thenewgarage]

Thank you Steve!

Another quick question...sourcing pre-74 running gear parts. I found a set of 108mm trans flanges but they have a 915 part number - 915.332.209.01. These are 72-on according to PET. From my initial inspection these should work - 4 bolt, everything appear to be the same to be (don't have them in my hand so take that with a grain of salt).

Can anyone confirm that these will not present an issue? I do not have enough experience with the differences between the units through -71 (911.332.209.00) and the 72-on (915.332.209.01). Are the teeth the same on the transmission side? Is it nothing more than a superseded part number? Going into a stock 914-6 trans that will be built by Dr. Evil.

Thanks!

[Harpo]

I have 110mm on my car. Works just fine and I got the C/V from Eric

[Steve]

72 was the first year for the 915 gear box. You want 901 coarse spline 108mm flanges. The fine spline 108's are for the 915 and won't work.

[Mark Henry]

In other words...

Buy a new set of 911 108mm axles with CV's...

http://www.pmbperformance.com/catalog/item...068/7781410.htm

Take the hardware off and install them on the Sway Away

https://swayaway.com/product/axle-set-porsc...long-28-spline/

Then source the correct 108 mm Stub Axles and Trans Flanges.

So...how does my logic sound here? Sometimes it can be off so your advice is appreciated!

Thanks!

Correct, buying the complete axle set gets you the boots (with the flanges) and the CV's. You need 2 axle sets for a total of 4 CV's and 4 CV boots.

The CV boot flanges are the kicker here as they are NLA, you can buy the bare boot cheap, but only if you have the flanges.
Then you could buy the boots and the G50 CV. It's bit cheaper this way if you already have the flanges.
Either way you still have to buy the Sway-a-Way axles.

[thenewgarage]

OK I will hold out to find a set of flanges that are 108 with the 911 part number to ensure it will be correct.

Thank you everyone for the information - much appreciated! (IMG:style_emoticons/default/beerchug.gif)

Now to post a wanted ad!

In other words...

Buy a new set of 911 108mm axles with CV's...

http://www.pmbperformance.com/catalog/item...068/7781410.htm

Take the hardware off and install them on the Sway Away

https://swayaway.com/product/axle-set-porsc...long-28-spline/

Then source the correct 108 mm Stub Axles and Trans Flanges.

So...how does my logic sound here? Sometimes it can be off so your advice is appreciated!

Thanks!

Correct, buying the complete axle set gets you the boots (with the flanges) and the CV's. You need 2 axle sets for a total of 4 CV's and 4 CV boots.

The CV boot flanges are the kicker here as they are NLA, you can buy the bare boot cheap, but only if you have the flanges.
Then you could buy the boots and the G50 CV. It's bit cheaper this way if you already have the flanges.
Either way you still have to buy the Sway-a-Way axles.

[mepstein]

Better luck finding that part on pelican than here.

OK I will hold out to find a set of flanges that are 108 with the 911 part number to ensure it will be correct.

Thank you everyone for the information - much appreciated! (IMG:style_emoticons/default/beerchug.gif)

Now to post a wanted ad!

In other words...

Buy a new set of 911 108mm axles with CV's...

http://www.pmbperformance.com/catalog/item...068/7781410.htm

Take the hardware off and install them on the Sway Away

https://swayaway.com/product/axle-set-porsc...long-28-spline/

Then source the correct 108 mm Stub Axles and Trans Flanges.

So...how does my logic sound here? Sometimes it can be off so your advice is appreciated!

Thanks!

Correct, buying the complete axle set gets you the boots (with the flanges) and the CV's. You need 2 axle sets for a total of 4 CV's and 4 CV boots.

The CV boot flanges are the kicker here as they are NLA, you can buy the bare boot cheap, but only if you have the flanges.
Then you could buy the boots and the G50 CV. It's bit cheaper this way if you already have the flanges.
Either way you still have to buy the Sway-a-Way axles.

[Mark Henry]

Better luck finding that part on pelican than here.

Yup.... and when they were last available they were quite spendy. Likely the main reason for the new half-shaft complete assemblies.
The price for just the NOS CV boot flanges was one of those "holy crap" Porsche moments.

[mepstein]

Better luck finding that part on pelican than here.

Yup.... and when they were last available they were quite spendy. Likely the main reason for the new half-shaft complete assemblies.
The price for just the NOS CV boot flanges was one of those "holy crap" Porsche moments.

Mark - what boot flange are you referring to? A replacement rubber cv boot runs $4. Not nos but ... What am I missing here.

[Mark Henry]

Better luck finding that part on pelican than here.

Yup.... and when they were last available they were quite spendy. Likely the main reason for the new half-shaft complete assemblies.
The price for just the NOS CV boot flanges was one of those "holy crap" Porsche moments.

Mark - what boot flange are you referring to? A replacement rubber cv boot runs $4. Not nos but ... What am I missing here.

The metal part of the CV boot, the rubber part is cheap.
VW/914 you get the whole CV boot, pressed together as one unit.

But if you order a CV boot for a 108mm 911 CV all you get is the rubber bit.
And IIRC a strap, no metal flange.

BTW if you do have the metal CV boot flanges and they are bent to crap DO NOT TOSS THEM, they are accually quite easy to straighten.

[Mark Henry]

Just checked my stock, no strap even, just the rubber boot.

[mepstein]

Do you mean these? They sell for around $20

[bradtho]

I've read this thread many times over the past several years. Been collecting parts for some time and now ready to put it all together. I sourced some vintage 911 axles, but the CV's weren't great so I bought a pair of new axles from PP. Comparing the vintage to new CV's today they are both 108mm, but otherwise the dimensions are quite different. Most concerning is the height which measures 39mm on the vintage and 31mm on the new.

Does this affect the correct length of the axle?

for reference, there was talk of buying the new axles for the CV's in posts #61-76 but no mention of the differences. here's a couple shots of the CV's left is vintage, right is new from PP.

[mepstein]

Eric can correct me if I'm wrong but since the sway a way axles are meant to float, I don't think the with of the cv's matter. You will need shorter cv bolts, something I've had difficulty finding.

[Steve]

Eric can correct me if I'm wrong but since the sway a way axles are meant to float, I don't think the with of the cv's matter. You will need shorter cv bolts, something I've had difficulty finding.

That's what I'm running on my car. Thin 108mm on the inside (transaxle flanges) and fat 1973, 108mm on the outside with sway away axles. They float on the axles.

[914Sixer]

I am going to run 911 SC stub axles, they are 100mm. Same size (100mm) as the VW Bus and 944. You will need the 100mm Coarse spline flanges from a early 915 transmission. You can order the shafts or cut 4mm off the stock 914 shafts. Bus boots and 944 are one in the same. Bus CV have 17 degrees articulation and the 944 has 22 degrees. Either one is over kill because the stock 914 is only 12 degrees.

[bradtho]

That's what I'm running on my car. Thin 108mm on the inside (transaxle flanges) and fat 1973, 108mm on the outside with sway away axles. They float on the axles.

Steve, looks like you're running the long bolts on the short side. no clearance issues there? I assume that may not be the case on the stub hub side.

[Steve]

That's what I'm running on my car. Thin 108mm on the inside (transaxle flanges) and fat 1973, 108mm on the outside with sway away axles. They float on the axles.

Steve, looks like you're running the long bolts on the short side. no clearance issues there? I assume that may not be the case on the stub hub side.

Not applicable for you. I'm running a 1986 915 gear box. It's a one year gear box with 108mm flanges. All the parts for this side are available new from Porsche.

[KTL]

Just to add more fuel to the fire, has anyone seen the racing style accordion-less boots used in a street car application? Go down the list and click on the Lobro 108mm CV boot listing

http://www.taylor-race.com/items.cfm?categ...2=Boots%2C%20CV


I suspect since these type of boots are intended for open wheel formula cars, the boot doesn't allow for a lot of angularity? I don't think the lack of an accordion is a big issue since the accordions are more of a feature for a FWD-like application where the CV actually pivots?