915 output flanges vs. 944 cv joints

[Michael Ghia]

Alex,
If you want to use 944 arms, no matter which arms they are (steel, narrow ally or wide ally) then use the driveshafts complete with CV joints which come with them.
In order to marry those driveshafts up to the 901 tranny, you will need output flanges from a 911SC 915 tranny.

The early 901 comes with small (T1 size) output flanges and the late 901 comes with 930 size output flanges. The 914 box comes with T1 size output flanges.

Another way to make stuff work would be to use the early or 914 output flanges (T1 size) and swap the CV joints over on the end of the driveshafts with T1 CV joints... that said I have never tried this so you'll be the guineapig! I suspect that the splines on the shaft will be the same but that you'll have to use an extra spacer on the splines before you put the cv joint on as the T1 CV joints are narrower than the Porsche ones.

Good luck, if I lost you please say so and I'll try to explain again.

Mike

[LOAF]

MG,

The first part makes sense, a little lost on second half..

As fas as sourcing 911SC 915 Flanges.. Is this a hard thing to come across..

I will do some investigating.. but for now this seems like my best choices..

Thanks again Michael.

ALex

[LOAF]

Michael,

I just got done with an email and got asked about the SC flanges..

The Sc Flages came two way corse spline and fine spline. Which do I need?

Thanks
Alex

[boygenius]

Alex, I'm not a real transmission expert so I can't be of any real help. The early and late aluminum trailing arms use the same axles and are interchangable. As long as they are 33 spline the type 1 CV joints will fit them, That is what Zen is using on his car right now. You should just be able to bolt up the axles using the type 1 inner CV's like Micheal Ghia suggested if you can't get the drive flanges you want.

[trevorbrady]

Originally Posted by boygenius

The early and late aluminum trailing arms use the same axles and are interchangable.

BG, is this a FACT, or second hand information? I don't mean to doubt you, but I want to be 110% sure!
I need to get drive shafts for my project pretty soon (i'm making do with type1 shafts and CVs as the type1 arms are still in place at the moment), and I need to know EXACTLY which ones, as mistakes in buying Porsche parts are costly mistakes!

I have early aluminium arms. I thought I needed early-late (make sense?) drive shafts to suit, but the early aluminium arms were only in production for a short while and are rarer compared to the late-late arms. If I knew for a fact that late-late drive shafts would do, I could get them pretty easily.

Just a thought, but how do type 2 drive shafts measure up, length-wise, against the various type1/924/944 drive shafts?
I know blind chicken has a page with comparisons between shafts/cvs, but I don't remember them comparing overall lengths of shafts. Anyone ever definitively document the differences in lengths?

[zen]

early and late arms both use 21" axles. i had a set of early arms on my bug first and then switched to late. there is a thread on here somewhere with good detail and pics as i was going through it. the difference in the width between the arms occurs at the hub. compare a rotor for a early and late and you will see what i mean. in fact, there is also a pic somewhere on here where i stacked the two arms and took some pics.

[boygenius]

What Zen said, plus make sure that you get the 33 spline axles and not the 28 spline axles. 33 spline count is what VW uses so type1 type 2 CV's will fit. The turbo cars came with the 28 spline so get some N/A axles. I use places like www.pelicanparts.com to cross reference part numbers in their online catalog. Look up what year your rear suspension is from to check on the axle assemblies and there will be a description of what other models and years those axles fit.