Axle questions for a Subaru Tranny, Another Subaru conversion... Options

[Corkus]

My 75 is getting a normally aspirated 2.5L EJ25 motor and 5 speed tranny from a 2000 Subaru Legacy. I don't want big power, but a nice reliable motor with a modern feel. The motor had 165hp and 165 lb/ft torque when new and it isn't going to be modified for more power.

The Bremar Tranny Conversion kit is on order.

After looking at all the conversion threads I could find, I didnt' figure out what to do about the axles. What are the issues to understand, kinds of parts I need and ideas about ordering or modifying parts. Wise advice are much appreciated. Thanks

Photos of parts I do not understand (Thanks to original posters if you are here.):






These are called "flanges" or "944 Axle Stubs" I think.

[charliew]

The 944 axle stub will accept bus cv's and the bus axle is stock on both ends. The 914 cv is a smaller dia so you put the 914 cv on the outer end of the bus axle to keep the 914 axle stubs. You go with the 944 stubs if you want to go with 911 5 lug hubs and brakes and wheels. The inner bus cv's fit the flanges you show in the picture. The flanges go on tranny stubs sticking out of the tranny. Some later 5 spd suby manuals don't have the stubs they are part of the suby inner cv.

A explanation of vw/porsche cv's is at Blind Chicken Racing. they use 911 and 930 porsche cv's on sandrail and buggy stuff for off road use. cv joint 101, it's under How To and then cv's and axles

http://blindchickenracing.com/

I don't know if anyone followed through on it but you can get axles splined for each cv and probably use the suby cv inner and the 914 or 911 outer cv on the axle length you want. It will probably cost as much as the flanges. If the motor is further forward and you need longer axles that might be the way to go.

[Corkus]

OPTION 1 The 944 axle stub will accept bus cv's and the bus axle is stock on both ends. The 914 cv is a smaller dia so you put the 914 cv on the outer end of the bus axle to keep the 914 axle stubs. You go with the 944 stubs if you want to go with 911 5 lug hubs and brakes and wheels. The inner bus cv's fit the flanges you show in the picture. The flanges go on tranny stubs sticking out of the tranny. Some later 5 spd suby manuals don't have the stubs they are part of the suby inner cv.

A explanation of vw/porsche cv's is at Blind Chicken Racing. they use 911 and 930 porsche cv's on sandrail and buggy stuff for off road use. cv joint 101, it's under How To and then cv's and axles

http://blindchickenracing.com/

OPTION 2 I don't know if anyone followed through on it but you can get axles splined for each cv and probably use the suby cv inner and the 914 or 911 outer cv on the axle length you want. It will probably cost as much as the flanges. If the motor is further forward and you need longer axles that might be the way to go.

Thanks Charlie, I went to Blind Chicken Racing and he does explain a lot of this.

OPTION 1 sounds like it is for making Porsche trannys work with Porsche and VW Bus stubs, axles and CV's. Doesn't sound like that is going to work very easily or at all on a Subaru tranny.

I think I get OPTION 2, Subaru inner CV, custom length and custom splined splined axle, and 914 outer CV . And to work correctly, the angle of the axle can't be too much for the CV's being used.

So, it's OPTION 2 then for a Subaru tranny. Right?



Does this photo look like OPTION 2?

[strawman]

I'm going with your "Option 2" -- Subaru inner "tri-pod" CV and Porsche outer CV.

However, I'm going with the Porsche 108mm 930-style CV for the outers. That CV is very strong, there is a strong aftermarket support (read that cheap and available) and they bolt on to the 911 hub-to-stub axle I'm using on the rear of my 914.

The 28-spline Porsche axle is larger at its smallest diameter than the maximum diameter of the Subaru axle -- so I'll have 911-style axles shortened and machined/splined to fit the Subaru CV on the inner ends. I figure axles rarely fail, but CV joints do. So if I encounter a driveline failure, I can find replacement parts relatively easily.

But since you're going with a relatively mild powertrain setup, I suppose you could get by with the 914 outer CVs. You'll probably want to make the switch to 944 CVs, however, since they're still available new. Are you sure you'll NEVER go after more power? If you have an inkling that you might, I'd go for the bigger/gutsier stuff now...

Best of luck, and be sure to post pics of your progress!

Geoff

[SirAndy]

You'll probably want to make the switch to 944 CVs, however, since they're still available new. Are you sure you'll NEVER go after more power? If you have an inkling that you might, I'd go for the bigger/gutsier stuff now...

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