The 01E gearbox that I (and a number of other GT40 builders) are using has a number of different driveshaft flanges depending on the original car it was fitted to.
These can be distinguished by the part number cast into them, this will be 01E409355 and optionally a letter. I’ve found details of A,C,F,H,J & K. If anyone has any details of any others it would be appreciated if you drop me a comment.
These same flanges are also fitted to other cars in the VAG stable, for example I’ve been informed the ‘A’ flanges are fitted to the Skoda Fabia (and the 01E itself can be found in the Skoda Superb).
The following table I found and copied from here http://www.audivw.ru/vagprice_1333.html
| 01E409355 | Flange shaft | 108MM |
Audi 80 Avant RS2 quattro Audi V8 Audi 100 / Avant quattro Audi 80/90 / Avant quattro Audi 100 / Avant quattro Audi Coupe quattro Audi A6 / S6 / Avant quattro Audi 80/90 / Avant quattro Audi Coupe quattro Audi A6 / S6 / Avant quattro Audi S6 plus quattro Audi A6 / S6 / Avant quattro Audi A4 / S4 / Avant qu. Audi A4 / S4 / Avant qu. Audi RS4 Avant qu. Audi A6 / S6 / Avant qu. Audi A6 / Avant
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| 01E409355A | Flange shaft | 100MM |
Audi 100 / Avant Audi 100 / Avant Audi 100 / Avant Audi A8 Audi A8 / S8 quattro Audi A6 / Avant Audi A6 / Avant Audi A6 / S6 / Avant quattro Audi A6 / Avant Audi A4 / Avant Audi A4 / S4 / Avant qu. Audi A4 / Avant Audi A4 / S4 / Avant qu. Audi A8 Audi A8 / S8 quattro Audi A6 / Avant Audi A6 / S6 / Avant qu. Audi A6 / Avant
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| 01E409355C | Flange shaft | 130MM |
Audi A8
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| 01E409355F | Flange shaft | 75.5MM |
Audi A4 / Avant
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| 01E409355H | Flange shaft | 88MM |
Audi A6 allroad qu. Audi A4 / Avant Audi A4 / S4 Cabrio./qu
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| 01E409355J | Shaft with flange G 01 03 3 >> * | 108MM |
Audi A6 / Avant
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| 01E409355K | Shaft with flange G 06 08 1 >> | 100MM |
Audi A4 / Avant Audi A4 / S4 / Avant qu. Audi A4 / Avant Audi A8 Audi A8 / S8 quattro Audi A6 / Avant Audi A4 / S4 Cabrio./qu
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Most of the diesel 01E boxes will come with the 100mm flanges, that 100mm is the inner diameter, the OD of the flange is 130mm. These are typically fitted with a tripod type inner joint rather than a Rzeppa type CV joint. A tripod type is meant to be more efficient however they aren’t as tolerant of extreme angles. A Rzeppa type CV will typically do up to 45°–48° of articulation, while some can give 54°. A Tripod type however will only do up to about 26°.
Audi/Skoda will only sell you an entire drive shaft however while you can get the inner joints (eg https://www.jandrcvjoints.co.uk/skoda-superb-2.5-diesel-2002/product/cv-joints-510/cv-joint/JR398 ) I’ve decided to swap out the flanges and fit Rzeppa type inner CV’s. This is somewhat problematic as these are rocking horse poo, very expensive S/H (NLA new although some have some NOS) and would have come to more than I paid for my gearbox!
Thankfully however a friend took a trip round a local scrappy and had a look at all the Audi etc diffs he could find and pulling all the flanges. After some searching he found a ” 01R525053E” which has the desirable 108mm diameter CV Joints (PCD 94mm) as used by the S4 (for which you can get the CV joints for) and these are dirt cheap s/h.
These are slightly different in size however appear to fit perfectly.
We’ve yet to try them in anger so this is untested however it appears to be a cheap solution to the flange problem.
Obvious disclaimer that you try this at your own risk, this advice is worth what you paid for it and any modifications should be checked by a qualified engineer before being used.