New convert under way

[img][You must be registered and logged in to see this link.][You must be registered and logged in to see this image.]47.serv[You must be registered and logged in to see this image.]img.com/u/f47/16/17/65/65/car_1-16.jpg[/img][img][You must be registered and logged in to see this link.]7.servimg.c[You must be registered and logged in to see this image.]om/u/f47/16/17/65/65/hpim9412.jpg[/img][/url][/url] You can see in the pics the TOB it is not sitting flush because the mounting bolts are behind the unit. You can see the axle location. As far as the axles go, my prelimanary look, shows me that the spline on the vette axle is i think the same as the porsche, I have slid my axle stubs on to the vette axle, seemed real nice, so i am hoping to use the vette axles with a little mods ( shorten ) but will confirm this on the weekend. Question how long are the porsche axles?

21 1/4" I believe, xschop will know for sure.

85.5-up cars are 21.3125" end-to-end

The pre 85, I have not measured. but that is the last piece of your puzzle. You need to search the VW T1 to 930 stub axle swap then go from there after you know where the trans outputs set. BTW they look right on the money with room to play forward and aft.

Thank you, i will check the lenth of the vette axle, but i suspect they are around an 1" or so to long, cut and spline i hope.

Good morning all, from the measurements i have taken using the photos provided by xschop, the out put shaft location is almost bang on, in the the pics. The vette axles insert into the carrier, not bolt on like the porsche. The shaft is much larger than the porsche units. If in fact the splines are the same, i am hoping to just have them shortened, and use those industrial cv's that xschop builds, to bolt right back into place. I think then they would be more than strong enough, But will see.

What is the PCD of the vette axle CV's
and spline count?

xschop, PCD, i am not sure what u mean? i will do a spline count tonight, and take a pic of the hub and axle. My axles only have the trany side the other end is just the splined shaft.

My bad, the PCD is Pitch Circle Diameter or the Bolt circle diameter of CV's... The 930 CV's are 94mm PCD whereas 944 CV's are 86mm. The C5 inner CV's are tri-plunge correct? So it would be easier to spline the C5 axle shaft.... My point is the stronger Type 2 CV's I run are 33 spline whereas the even stronger 930 CV's are 28 spline...FYI
It would be pure bliss if the C5 outer stubs had the same spline count as the 944

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Ty xschop, i will chek tonight.

Hello all, xschop what do you mean by tri-plunge, so heres what i can tell you about the vette axles. I did a spline count on the vette axle ( out board 25 1/4" long pics to follow ) and it is 28 , so the same as the 930. i pulled the circlip off the end and slid on the S2 hub,( count on that was 28 to ) i also inserted the S2 stub axle into the hub, they both appear to slide on to the same depth. ( which is tapered hub i think ) The vette axle fits 1000% in my opinion, So in therory we should be able to pull the trans side vette CV ( i will post pics in the am it has a larger diameter end and internal spline) off the axle, as it inserts into the carrier and insert a new porsche axle or xschop axle cut to length back on to the vette CV, or have the vette axle shortened and replined and install into a outer porsche CV, eather way i think it is win win. THOUGHTS?. the pics will help with what i am saying. I think this is the solution to make this work. I would think one of these would be a cost effective solution to the issue. How costly is a cut and respline? This conversoin just keeps getting better, the dude at GM who designed these parts, must be GERMAN.

[You must be registered and logged in to see this image.] please view and make sugestions. THANKS kEVIN.

I've never seen the trans side CV pics with boots removed, they just look like a 3 prong roller type, But Hopefully they are 6 ball CV's with the 28 spline count. It is important to make sure to measure the crest/trough dims on the axle splines like the pic I posted. Remove the C5 axle CV boots, then remove the axles and measure them. My C5 differential has a GETRAG tag and the first thing that came to mind was 930 CV and axle. Somewhere there sets an off-the-shelf axle length....

Ty i will do and take pics.

Do you not have the early trailing arms and stub axles/hubs?

My car is a 1978 924 base, i have changed the rear torsion unit and suspension complete to a 91 S2, i changed the front to the matching 91 S2, except for the control arms,they are still the steel in front but new. I have to use my origanal cross member up front but have had it reinforced and plated drill etc to match the alum specs. My trans axle is the Gertag unit.

Plan B.....

Clean the S2 stub axle and mic everything. I have the 911 Turbo Stub axle dims somewhere. IIRC the splines are the same.

Well, i dove into the world of the torsion tube mod. ( i will post pics on monday ) i had my old 924 torsion tube, so i did a cut and fit with it, i will fine tune this one side before i cut up my good one. You will see in the photos i have hung it back inplace, with the trailing arm and temp shock, It seems to fit well. I will need to trim the torsion tube on an angle to maximize the space for trans movement. I dont think you will be able to drop the trans alone, u would have to take Torque tube aswell, but we will see. What i need to find out is if the alum towers coming out the passanger of the trans that surround that sensor near the front are of any importance, no hidden rods inside, If they can be cut back it would be a plus for clearance on the torsion tube, but would be ok if not.From what i see i will do a single hoop from side to side on the torsion tube, and brace right at the end, closet to the middle. I think a bushing of somesort running flat across the top of the torsion tube that can be mounted to the new trans hump.Started playing with the sheet metal for the trans hump, split the old stock unit up the middle and reshaped it with a few different hamers and a hunk of train track, turned out very well, trying to reuse as much of the factory parts/ metal as possible. If i dont have to buy and can reuse, its a win win. its just time, All the time the weight keeps coming off. Thanks JC. One thing for sure the factory under coating, they dont skrimp. What a pain in the but.

[You must be registered and logged in to see this image.] As you can see by the pics the trans and suspension will work together. In the forth pic you can see the towers i am talking about, can they be trimmed.

Yes, they are protectors for that sensor, just be mindful of it when removing the trans.

Also, you'll need to measure the I.D. of the trailing arms where the CV's rotate to see if you can put a 930 CV there or go another route.

Thank you . i will measure, my bearings are out of the trailing arms. bought new, not cheap,is the 930 CV of similar size to the 944.

944 CV = 100mm O.D.
930 CV = 108mm O.D.

Just remember that even a weld-on flange will need at least 1mm per side O.D. for centering perposes while being bolted down, so your trailing arm have to clear at least 110mm.

So i have been surfing the net looking into the axle situation, this is what i read, CV Type 1 Max Angle12 Spline 33, Type 2 Max angle 17 Spline 33, Type 4 Max angle 22 Spline 33, 930 Max angle 25 Spline 28, So these are my measuements of the stock 1991 S2 stub axle # 951 332 235 measurements as follows CV Flange ID 100.19mm OD 109.21, Spline length 32.71mm, spline end 30.57mm , Bearing area length 38.40mm , stub axle total length 5 3/8" the room in the trailing arm where the stub sits is 115.40mm, My spline count keeps coming up 28?so what does this mean? What the heck am i doing wrong? Are the spline counts on the stub axle the same as the axle shaft? the 930 stub CV flange OD 110mm, CV bolt circle 94mm, Spline length 42mm, Bearing area length 50mm, inside seal diameter 58mm, inside seal surface length 12mm ,Overall length 165mm, Spline 28. How do we make the 930 CV work with ours.What am i missing. You can buy off the shelf 930 axles sets 15 5/8" and 16 1/4", 16 3/4", 17 1/2", 18 3/4" up to 28". If my S2 stub axle is a 28 spline count. It should be as easy as set the trailing arm at ride height and measure inside cup to cup and sutract 1/4" to 3/8" to allow axle movement so it won't bottom out on one side or the other, and have the axle cut and resplined if need be or maybe will get lucky and the off the shelf will fit. THOUGHTS

Well these axles for our cars are all over the board. Spoke to the tech chap at Paragon, i was surprised to here that the S2 spline count is 25? Did more research and YES spline 25. So if the axle shaft spline is the same as the stub axle i have an anomolly. Yes it is a 91 S2 rear suspension, my stub & hub are 28.
Spoke to a chap at my local machine shop and he will cut and respline my vette axles to what i need.
So heres the thing, what will be my choices for CVs. S2 25 spline should be rock solid.If the 930 and 911 are 28 and are better than the Type 1-4 at 33 spline then the 25 spline S2 should be better than the 930 28 spline, right.THOUGHTS ANYONE

I think you are talking 2 different things. The CV spline is for the CV shaft and the stub axle presses through the bearing and the stub spline indexes into the wheel hub. The stub axle spline has nothing to do with the CV joints.

Thanks i know they are differant, but what is the spline count on a stock axle.From what i have found my vette axles are large and should be plenty strong enough, its what CV to run? Well, new info the S2 CV joints are a 25 spline so stronger than the 930. These CVs fit 911 C4,944 S2, 944 Turbo, 968, and Boxster.