915 output flanges vs. 944 cv joints

[canibugu]

looks like nobody knows.

I have the same question

[Wally]

Well, I'am no 'output flange' connaisseur, but the above pair is most likely 915 late style. The 110mm CV flange diameter is typical, as are the 4 x M10 bolt holes and the two dowels. Useless for any VW-type vehicle as 110mm CV joints only come with Cv's that have porsche axle inner splines, unless of course if you can also use the porsche CV's at the wheel end, then a porsche axle of the right length can be used.

The 90mm (your 88mm) CV's are most likely VW bug CV's, so those flanges are probably from an IRS bug anyway.

I have rounded of your measurements as there are only 3 relevant CV sizes: 90mm: bug
100mm: T2/T3 busses and 944. 944 has probably different (porsche) inner splined axle size then VW busses have!!
110mm: late 911 (most, not all!) 915 gearboxes.

Simple.

[boygenius]

The turbo 944 has 28 spline axles so the turbo CVs won't fit. The n/a 944 has 33 spline axles and the type 1/ type 2 CVs will fit them. At least this is true for my 1987 n/a axles. I thought the 930 had 108mm CVs.?

[Michael Ghia]

Trev,
The 94mm flanges are stock for late 901 transmissions, code 911/** and also early 915 transmissions up to 78.

The 77mm flanges are stock for 914's and early 901 transmissions code 901/** and are stock T1 size.

The ones you want for T2/944 CV's are fitted to 911SC's only from 1978 to 1983. They will bolt into any 901 or 915 transmisison.

MG

[GS guy]

Or... you can have your output stubs modified to accept the T2 100mm CV's. I just did that for a 914 box - some of the original smaller (914/T1 size) flange was machined off, new custom machined chromoly T2 size flange fitted and welded to the stub. Finished up with nice black oxide coating - awesome work!
Work performed by Todd at Precision Alloy:
www.precisionalloy.com
Jeff

[LOAF]

BG,

Question for you.. FYI, I have been cross posting.. but I am lost...

See if you can help me out here.. As far as a conversion with the following.. 901 (911) tranny to 944 late N/A arms.. what do I need once I have everything on the ground..

As I mentioned my not so unique situation is the following..

I am doing the 944 late conversion with sigle piston brakes.. I have the following parts that I would like to reuse as part of this conversion..

The have the 944 Stub axles.. which I am not sure I can swap out..
The 944 Axle that is conected to the Stub..
and shortly within a week a 901 (911) tranny...901 trans from a 66-68 912/911

The seller has different output flanges, but for starters I am not sure which flanges to even ask for.. man I am confused..

I am not sure what can mate with what.. If there is a simple solution out there.. I am not looking at Big Hp numbers.. 100-150 at most..

What is your recommendation?

As far as the tranny T2, or is there a stock 901 part?

Which axles. 944 or T2.. will these mate to the 944 stub axle.. I will check how many splines and if it has a part number..

What CV Joints do I use?

Do I have to replace the 944 Stub axle?

Help
Alex

[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