YFCM Carbon Driveshaft Installation Tips

YFCM Carbon Driveshaft Installation Tips

Recommended Hardware

  • 1x Flexdisc "guibo" (SKU:  26112282573)
  • 1x Balanced CV flange / Diff bolt (SKU: 26112284154)
    • Actual SKU may vary depending on your diff & driveshaft balancing specs. My diff had a blue line and it indicated the Black balanced bolt. 
    • For more information, refer to RealOEM diagram here
  • 5x Standard CV flange / Diff bolt (SKU:  26117526322)
  • 3x Self Locking Nut for Guibo / Transmission flange (SKU: 26127536563)
  • 6x Hex Bolt for Guibo / Transmission flange (SKU: 26117527475)

Installation Tips

The installation of the YFCM carbon driveshaft was relatively straight forward - yet it has new mission-critical information that we were never made aware until I started chatting with M.Lee at YFCM.

Professional installation is recommended. A lift will make the job a whole lot easier.

You need to remove the center exhaust bracket, disconnect 02 sensors off the exhaust and remove the entire exhaust systems. 

The OEM steel driveshaft and center support bearing can then be removed. 

The transmission then needs to be supported for the transmission mounts to be removed.

It is required for the transmission to be lifted upwards within the tunnel to give as much clearance as possible to fit the 1 piece driveshaft along with the wrenches needed to torque down the flanges. 

It's a tight fit!

One interesting finding is the overall length of the driveshaft. The V3 from MFactory was shorter for some unknown reason.

We needed to lift the transmission all the way up with the engine supported - and loosen the differential bushings and pry off them to get the YFCM to fit.

It's a tight, precise fit - unlike the V3.

Balanced Differential & CV Flange Bolt 

I chatted before about aligning the balanced CV / diff bolt colored in black with the blue mark on the diff but took a clearer picture this time around.

Telescopic Flange Measurements

The picture below shows something new.

The CV flange is telescopic and allows for some play for the rubber bushing in the powertrain such as the engine mounts, transmission mounts, diff and subframe bushings.

YFCM is adamant about measuring the gap when everything is bolted back together and the engine is back on its mounts.

You should measure a standard gap of 64mm. The telescoping range is +11.5mm forwards and backwards.

Carbon Tube Clearances

Additionally, the smaller diameter tube of the YFCM driveshaft allows for more clearance with the transmission tunnel compared to MFactory's V3.

However, carbon tubes are still larger than steel driveshafts - and more susceptible to being damaged by screws and bolts that are at the top of the tunnel.

YFCM mandates a 20mm clearance between the tube and the tunnel.

There are 2x bolts and 1x screw by the CV flange that are to watch for.

Replace worn bushings and mounts!

If your bushings and mounts are worn - I highly recommend you change them. 6spd guys should be mindful of wheel hop on hard launches.


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