Audi R8 transaxle dimensions and questions.

[Jon]

Hello,

I have been researching the Graziano transaxle from a R8 and have a few questions.

The R8 transaxle is a AWD unit (North American version that I have access to), with the Audi V8 or V10 (lambo the same unit?). Looks like the lower portion of the Audi block has an integral passage for the forward shaft to connect to the front differential. Has anyone here bolted a Ford Modular engine to this transmission? Or are people getting a RWD only unit, or possibly removing the lower shaft if that's an option? Im inquiring if a Ford mod engine, 4.6/5.0 could bolt to this transaxle and still use the forward shaft for an AWD machine.

I have some pics attached of dimensions I would require to see if this could fit into a build I have, if anyone has access to this and could supply the dimensions that would be greatly appreciated. Adapter plates general thickness in the 1-2" range? I would use the Ford flywheel and starter, but use a R8 clutch? Would I need a custom pressure plate? Does anyone have the input/output shaft splines, and diameters?

Thank you for your help.

Jon

 

[Ole Nylende]

W is approx 185mm, L approx 750mm.

If you need the rest i can take measurements during weekend as i have a loose transmission in the basement. The shaft for front diff can be chopped off.

 

[Joel K]

Jon,

Kurtiss installed the Graz with a Coyote engine. He did a detailed write up in a pdf file. The link to the file is in post #34 of his build thread…lots of great info.

Kurtiss' GT-R

David, thank you for the info. I was using the Astro rivnut tool today in a tight spot and could have use the tool from Pegasus. Time to order this tool.

www.gt40s.com

 

[Jon]

Thank you for those dimensions, they help a lot.

I just looked at Kurtiss thread, that's an amazing car he built. looks like the adapter plate is way smaller than I envisioned. ill have to send him a message about the flywheel/clutch setup in detail for sure. thank you.

Jon

 

[Ron McCall]

Jon,

You should contact HCF Autosport (https://hcfautoparts.com/)
They will be able to get you straightened out.


Ron

 

[Ryan L]

There is a 3d scan of one here

Graziano Transaxle Transmission — Bremar Automotion 3D Scan Store

Graziano Transaxle Transmission

www.bremar3dscanstore.com

 

[Jon]

I sent a message to HCF, well see what kind of info they have.
Thanks for your help.

 

[Alexander M]

If anybody can help, I am also looking for accurate CAD. I have a rough comparison: LS+Graziano and W12+G86.20. Overall, the W12+G86.20 is slightly more compact (main driver in my project + 12 cylinder sound). The Graziano has the output wheel shafts roughly 35mm above the crank centerline, the G86.20 locates the output wheel shafts 100mm below the crank centerline.

C

Thread 'Graziano L140 drawings and bell housing patterns'

Dec 22, 2024

Hi There,

I am looking for an exact CAD file of the external surfaces of the Graziano L140 or at least a drawing of the bell housing pattern. I do have that 3D-scanned file from GrabCAD but would appreciate accurate dimensions. Here an overview between the Porsche G86.20 and the L140.

Can sombody help?

• CTCH
• Replies: 0
• Forum: GT40 Tech - Powertrain/Transaxles

 

[Alexander M]

Just realized that the L140 requires the engine to be offset to one side. Super freaking ugly. Does anybody know how much this offset is with a typical LS engine? Is it noticable?

 

[Joel K]

For an LS, the engine can be centered. The front facing drive shaft is either cut, removed, or the oil pan/block trimmed slightly. That is the way we all use this Transaxle in SLCs and GT-Rs. One axle will be longer on the driver side.

 

[Alexander M]

OK, got things in here. One side is 405mm, the other is 321mm if I center the engine. Is that acceptable?

 

[Joel K]

Building a Countach? If so, very cool project. I think your numbers are dead on, my engine is centered and the passenger axle is 3.5” shorter.

Pic of the trans installed and the engine centered…

Pic of axles and lengths…

 

[Alexander M]

Okay, thanks for the reply. Where did you get these axles made?

 

[Joel K]

Okay, thanks for the reply. Where did you get these axles made?

The Driveshaft Shop - Home Page - Driveshaft Shop

DriveShaft Shop engineers built driveshafts for 30 years leading to many record-setting race-car builds. We specialize in the impossible.

driveshaftshop.com

Tad Todmann is the axle guy there if you have any questions.

 

[Joel K]

Keep in mind the V8 and V10 Graz have different flanges and Drive Shaft shop can supply the right adapters for the V10. I read somewhere that you can get a CV which mates up to the V10 flange but don’t remember who documented that,

 

[Ron McCall]

Okay, thanks for the reply. Where did you get these axles made?

PM sent.
Ron

 

[Alexander M]

Thanks. These have a compressed length and an extended length, correct? Can I get the specs? I want to understand if they fit what I am doing here.

 

[Joel K]

You would want it long enough so the angle on compression and rebound is not too large. DSS makes them custom length,

Ron who just replied can answer any question for sure. He specializes in transaxles and installed the drop gears in mine. That is also another issue, you will probably want a set of drop gears for the Graz since it is geared for a higher revving engine than an LS. 3000 RPM on the Highway is not ideal, the drop gears can bring it down to about 2100.