HOW TO: Convert to real 5-lug in the rear using 944 CVs Options

[Aaron Cox]

Updates - I'll go measure the short 944 axle at lunch.

Also, my buddy should be finishing up spacers today or Wednesday (bogged down with REAL work).

Another note, finally found a pair of 915 trans flanges.... for less than a butt rape price (IMG:style_emoticons/default/smile.gif).

Pics/measurements/part numbers to come soon.

[rick 918-S]

Too late for a set of spacers?

[Aaron Cox]

Hi Rick, I think i can get 8 sets out of this block i bought. I'll keep you in the loop.

Ok, Axle lengths.
944 auto (short side) = 51cm
914/4 = 51.5cm

944
(IMG:http://www.914world.com/bbs2/uploads_offsite/a8.sphotos.ak.fbcdn.net-219-1332187473.1.jpg)

914
(IMG:http://www.914world.com/bbs2/uploads_offsite/a1.sphotos.ak.fbcdn.net-219-1332187474.2.jpg)

Also, here is the PN of the 915 (sporto) trans flanges you want.
(IMG:http://www.914world.com/bbs2/uploads_offsite/a8.sphotos.ak.fbcdn.net-219-1332187475.3.jpg)


(who is amazed there were no sandals/ugly feet in the pic?)

[jaxdream]

From your measurements , the 944 axle is a bit short . If you space the stub axle out towards the transmission the short amount , then the axle will not bind . YMMV.........

Jack

[jaxdream]

Hi Rick, I think i can get 8 sets out of this block i bought. I'll keep you in the loop.

Ok, Axle lengths.
944 auto (short side) = 51cm
914/4 = 51.5cm

944

914

Also, here is the PN of the 915 (sporto) trans flanges you want.


(who is amazed there were no sandals/ugly feet in the pic?)

There is that gash by the index finger ......... (IMG:style_emoticons/default/poke.gif)

Jack

[Aaron Cox]

From your measurements , the 944 axle is a bit short . If you space the stub axle out towards the transmission the short amount , then the axle will not bind . YMMV.........

Jack

I highly doubt that 4mm will effect anything short of an offroad ride height 914... feel free to try or not try the 944 axle.
(think about how much 1*rear toe change would effect axle length with an ~18" long trailing arm)

and yes... gashed hand, beat up ring. (IMG:style_emoticons/default/hissyfit.gif)

[jaxdream]

Aaron , I'd love to get a set of the 944 axles ( these are for the auto trans ?? What year ?? ) . That way there would be no need of machining the 914 axles and have the full length of the 944 spline on both ends . the spacing thing was an idea just in passing as someone earlier in the this thread mentioned using 944 axles that got into a bind on them. I'm using 911 SC hubcentric wheel hubs and have a choice of using 911 SC cv stub axles or 944 stub axles. The length of the 944 auto axles is very interesting as it would'nt be a big problem of making a spacer to space out the stub to make up for the 4mm difference if one so chose to do so , yes you are right about the 4mm not being a real deal breaker as it would only come into play at full droop or rebound up of the suspension . Please keep updating this thread with your findings , as the use of the 944 auto axles hasn't been covered and would be a great addition to this sticky.MHO.....

Jack

p.s. I think most folks here have made a blood offering to our cars at one time or another , and usually a continuing deal with the car Gods.... (IMG:style_emoticons/default/pray.gif)

[Aaron Cox]

944 Axles i got were from ebay from LA Car Dismantlet/TNT Motors. I paid 37 an axle shipped and all the CV's i got are in real good shape.

Basically, you want any year 944, or 85-86 Turbo. 944S/S2 ant 87+ Turbo's used 25 spline axles.

I'm not sure what year the 944 auto axle came out of, or why they are different lengths on each side.

Also, the 944 auto axle is significantly heavier than the 914, for the same length/same splines. I doubt any one breaks axles before they break a cv... so i'd stick with the machined 914/4 axle.

[Aaron Cox]

Alright, so my friend got a few sets done in his spare time, and we can crank out a total of 7 sets from the block i bought. I've PM'd the first group of people that I can take their money and mail them a set of spacers. The rest will be done first week of april. Hope no one is in a hurry! (IMG:style_emoticons/default/smile.gif)

My pal is doing this in his free time for me, sorry for the delay.

So a 914 bearing is 37mm wide.
911 hub is 36mm wide.
951 stub is 6mm wide.
Spacer = 5mm wide.
hub (36mm) + stub (6mm) - spacer (5mm) = 37mm.

Inside edge chamfer to fit 944 stub.
(IMG:http://www.914world.com/bbs2/uploads_offsite/a8.sphotos.ak.fbcdn.net-219-1332430382.1.jpg)

In Place.
(IMG:http://www.914world.com/bbs2/uploads_offsite/sphotos.xx.fbcdn.net-219-1332430382.2.jpg)

[SirAndy]

I highly doubt that 4mm will effect anything short of an offroad ride height 914...

I hope you are right. 5 mm may not sound like much, and the two CVs will split the difference, but you're still going to run it slightly off center for 99.9% of the time.

(IMG:style_emoticons/default/idea.gif)

[Aaron Cox]

I highly doubt that 4mm will effect anything short of an offroad ride height 914...

I hope you are right. 5 mm may not sound like much, and the two CVs will split the difference, but you're still going to run it slightly off center for 99.9% of the time.

(IMG:style_emoticons/default/idea.gif)

2mm split on each side... but good observation.

I wonder where the inner cage is in relation to the outer while at our typical lowered ride heights? I'm betting the cages are also off center 99% of the time.

Not an issue if you machine the 914 axle vs running the short 944 axle as you have.

[Aaron Cox]

Followed Andy's directions step by step, and got a winning product (IMG:style_emoticons/default/smile.gif)

A buddy machined the /4 axles


and a little cleanup, rubber mallet and some greasy finger nails (IMG:style_emoticons/default/smile.gif)


Regarding the spacers, i've got a handful (4 more sets), and I'll pm people in the order i received the pm. Sent a couple pairs out already.


Thanks for the writeup andy!

[TravisNeff]

Aaron, I thought you were gonna try using the 944 axles (short side) instead of modifying the -4 ones?

[Aaron Cox]

Aaron, I thought you were gonna try using the 944 axles (short side) instead of modifying the -4 ones?

That is a suggested alternative. Buy (2) short 944 axles and bolt them in. I only had one, so i went the tried and true 914--> 944 route.

[Krieger]

So I finally got my "Sir Andy" style axles in my car. The only hiccup was that the stock 944 cv bolts that came in the rebuild kits were 45mm. They were not long enough to reach through the trans/stub flanges. They only went in a few turns. I bought a set of 55mm cv bolts. They were a little too long and hit the inner side of the trailing arm around the wheel bearing so I trimmed them. On the trans flange side they stuck out probably 5 mm, but there is no interference problems. 50mm bolts may be long enough to have the end of the bolt flush with the back side of the flanges. Sorry if this was discussed here already.

[Bates]

Thank you to Sir Andy and all who posted. I just happen to have a 1986 944 with an automatic sitting behind my shop, already being scavenged for parts.

I was amazed that yet again, the big German Auto parts bin, used interchangeable parts on cars produce years apart.

My 914 project came to me with 914 axles , hubs etc, and 911 wheel flanges. One of the P.O. s had not tightened the wheel flange nut, so one flange is destroyed.

I have purchased a 915 gearbox, so I already have the inner axle flange covered, and needed the axle flange to 'talk' to the same size CV joint. The fact I had the correct flange sitting with a few feet of the 914 still amazes me, not to mention I have the axles and the CV joints from a 944 auto with under 90K miles (read 'unstressed').

Thank you Sir Andy !!

[jimkelly]

so, are these parts still readily available these days and what price should one expect to pay a pair of the hubs and for a pair of the stub axles?

thanks
jim

Based on Andy's notes I've assembled these details on part numbers...

Rear hub 1969 --> 1973 "901 331 065 09" 911 T/E/S *Not Carrera"
Rear Axel 1970 --> 1983 "901 332 232 00" 911 SC/SPM *Not Turbo*

944 CVs Any year, non-turbo "944 331 901 00"

I haven't researched transmission flanges. They will depend on your transmission selection.