Suby axle and DOJ cv issue., 25 splines to the diff, 30 splines to the axle. What CV is this? Options

[ruby914]

I put a 02 WRX motor in my 914 and have a MY03 TY754VN2BA trans staged for transplant.
I needed inboard CV’s so I went down to the local pick-a-part and got CV’s off of a 99 Legacy.
One CV was green the other was black. More so the black had ball and cage, the green had the tri roller setup. Both CV’s had the 25 spline count so I felt all was good.
Next, I sent a set of 914 axles with the inner race from the black CV to a machine shop to have them re-splined to fit the inner CV race.
When I got them back they fit great. Problem is the green CV has a different spline count inside the CV. I didn't notice this before.
ID on the green is 9 SFJ 82 NTN A R 3 T 29 splines to the drive shaft "trunnion" (inner race).
ID on the black is DOJ 87 AC NTN 30 splines to the drive shaft.
So my axles were splined for the DOJ 87 AC
Was this a mistake? I have searched the net and can’t find what model cars these fit. Can’t tell if it was proper for the car it came from. I think not.
I would hope to have chosen something common.

Anyone have an idea what cars these come from?
I would like one more DOJ 87 AC to get the project moving.
Maybe I should I re-spline a 2nd set of axles to something more common?

I am a little confused here. I think it was after 04 that the CV had shafts to the trany and the inner race "trunnion" was 30 splines. Did any of you do axles for the 03 and what spline count did you use?

[76-914]

Whichever one you use will be stronger than the Type4 CV.

[ruby914]

Whichever one you use will be stronger than the Type4 CV.

After all I have found on CVs, I am starting to question if this is correct.
All this work looking for the CV to fit a 30 spline shaft lead me to Subaru Hi output applications.. Legacy TT, STI, JDM. Even with this larger DOJ 87 AC on the inboard side, the balls are only about .660 where the Type4 CV has something like .675.
Outter race OD is about the same.
The guy I got my DOJ 87 AC from had 1 good one out of 3 from his STI.
So if his STI is AWD and we are feeding the same power (give or take) to two wheels, wouldn't we need something considerably stronger?
I am starting to think we just have not seen or heard of the Suby CVs breaking on the 914s yet.

After breaking an inboard CV on the 901 trany and beating the life out if the starter, I am also starting to question the "CV fuse" thinking. That may still be good if your racing but I would think on the street your tires should be a good breaking point?

[76-914]

Whichever one you use will be stronger than the Type4 CV.

After all I have found on CVs, I am starting to question if this is correct.
All this work looking for the CV to fit a 30 spline shaft lead me to Subaru Hi output applications.. Legacy TT, STI, JDM. Even with this larger DOJ 87 AC on the inboard side, the balls are only about .660 where the Type4 CV has something like .675.
Outter race OD is about the same.
The guy I got my DOJ 87 AC from had 1 good one out of 3 from his STI.
So if his STI is AWD and we are feeding the same power (give or take) to two wheels, wouldn't we need something considerably stronger?
I am starting to think we just have not seen or heard of the Suby CVs breaking on the 914s yet.

After breaking an inboard CV on the 901 trany and beating the life out if the starter, I am also starting to question the "CV fuse" thinking. That may still be good if your racing but I would think on the street your tires should be a good breaking point?

Well first off Mike, you'd be crazy if you didn't question me. (IMG:style_emoticons/default/av-943.gif) As far as power to 2 wheels. The 914 is much lighter, your only spinning one wheel not 4. Where are you with this? Did you ever get your axles re-splined?

[ruby914]

Whichever one you use will be stronger than the Type4 CV.

After all I have found on CVs, I am starting to question if this is correct.
All this work looking for the CV to fit a 30 spline shaft lead me to Subaru Hi output applications.. Legacy TT, STI, JDM. Even with this larger DOJ 87 AC on the inboard side, the balls are only about .660 where the Type4 CV has something like .675.
Outter race OD is about the same.
The guy I got my DOJ 87 AC from had 1 good one out of 3 from his STI.
So if his STI is AWD and we are feeding the same power (give or take) to two wheels, wouldn't we need something considerably stronger?
I am starting to think we just have not seen or heard of the Suby CVs breaking on the 914s yet.

After breaking an inboard CV on the 901 trany and beating the life out if the starter, I am also starting to question the "CV fuse" thinking. That may still be good if your racing but I would think on the street your tires should be a good breaking point?

Well first off Mike, you'd be crazy if you didn't question me. (IMG:style_emoticons/default/av-943.gif) As far as power to 2 wheels. The 914 is much lighter, your only spinning one wheel not 4. Where are you with this? Did you ever get your axles re-splined?

Yea Kent, the lighter car is a big consideration as well as what rubber you are running. I do totally agree that it is better to break a CV than a trany but for as light as a 914 is it would be nice if the complete drive-train would hold up to the power plant with confidence.
That takes me to the trany. I think it was The Heaterguy that I saw on NASIOC picking brains on why he was breaking Subaru transmissions. It got me wondering if putting the AWD power into 2wd is making a new weak link? Just thinking out loud.

Yes... the axles (IMG:style_emoticons/default/headbang.gif) I finally found the DOJ 87 AC. With the 30 spline shaft.
They cam from an 03 STI. The guy was great to break them down and clean all the grease out. He had 1 good one out of 3. Seems he drove his car hard.
Do you remember the comment about my axles being something like 15" and it would be hard to cut them down to 18"?
That was in your build thread. Later I called you, I think you said you took off 30 ~ 32mm. I felt safe with that and I sent them to Dutchman.
I got them back in no time.
I bought axles from bddrcfjfvy because I wanted to drive the car with little down time. Just pull my trany and axles and swap the suby trany and new axles.
Well, I don't know what he sent me but they were not 914 axles. (IMG:style_emoticons/default/lol-2.gif)
That 15" thing should have been a clue.
Do you know any one doing a Bug Suby swap?
So.. I am riding the KTM to work. Car is all 914 now, on jack stands.
I sent my axles off yesterday.

[DBCooper]

I am starting to think we just have not seen or heard of the Suby CVs breaking on the 914s yet.

I don't see that the Subaru drag racers break as many Subaru CV's as I seem to break 914 CV's. That seems a reasonable indication, but we're going to know the real answer to that question pretty soon. As more people are up and running with inner Subaru CV's and outer Porsche we'll have a direct comparison and see which go first. I'm betting on the 40 year old 914's but am curious too.

That takes me to the trany. I think it was The Heaterguy that I saw on NASIOC picking brains on why he was breaking Subaru transmissions. It got me wondering if putting the AWD power into 2wd is making a new weak link? Just thinking out loud.

I'd be cautious reading much into that since he's running about 550 wheel HP through race slicks. That's the equivalent of about two STi engines, a lot more than any of us will ever see. Now that I think about it I'm impressed that he didn't break the CV's first. Wonder what he's using.

I'm just about to send some axles off to be re-splined. Wish I could wait to know the answers to these questions for sure, but can't. But I'm really curious. I think I'll go the 19 inch length too, seems logical.