Alfaholics GTA-R Diff Oil Sump

£495.00 GBP (ex vat)

ALF-105-EDS | ALF-105-EDL

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CNC machined billet aluminium increased capacity diff sump for 105/115 axle cases. Available in 1300/1600/1750 version & 2000/Montreal version with extra ‘tongue’ at the front. High horsepower 105s start to suffer from excessively high diff oil temperatures under hard use, excessively high diff oil temperatures cause premature CWP wear. The diff sump size & design was originally specced for the early 1300cc 101 Giuliettas, it was run through to the later 105 models unchanged and certainly never intended for the type of BHP or load that so many of us put through the cars today. Excessive whine and backlash noise at the end of long hard drives that go away when the car has rested are classic signs of overly hot diff oil.

We have designed the diff sump to carry 23% additional oil capacity and redesigned it with a combination of both larger & additional lateral cooling fins (in a similar design to a GTA engine lower sump) to dramatically increase the surface area for airflow and therefore significantly increase cooling efficiency of the sump. Additionally the fins are drilled ready for lockwiring the sump plug, as fitted to all our latest GTA-R builds.

The diff is anodized to protect the aluminium and comes complete with a lightweight race ‘lockwire drilled’ sump plug, stainless cap head bolts and a sump gasket.


  • gta-r: GTA-R
  • filter_gta_r_mechanical: Mechanical
  • mechanical-by-the-book: Mechanical (By The Book)
  • filter_book_mechanical_rear_axle_external: Rear Axle External