Bmw 188K medium case Blackline Helical Limited slip Differential

This unit fits the following models

  • Suits:-

  • E38 728i Auto
  • E39 Manual - 520i, 523i
  • E39 Auto - 523i, 530i
  • E46 Manual - 320i (with 188l casing), 325i, 325ti, 325xi, 328i
  • E46 Auto - 318d, 323i, 325i, 328i (3.46: ratio), 330i
  • E53 Manual Rear Diff - X5 3.0i
  • E53 Auto Rear Diff - X5 4.4i, X5 4.6is
  • E60 Manual - 520i
  • E60 Auto - 520d, 520i, 525i, 535i (SMG), 530i , 535i, 535xi
  • E63 630i Manual & Auto
  • E70 X5 3.0d Auto Rear
  • E70 X5 35ix Rear
  • E82 Manual - 125i, 128i
  • E82 Auto - 123d, 125i, 135i
  • E83 Manual Rear Axle - X3 3.0d
  • E83 Auto Rear Axle - X3 2.0d
  • E85 Manual - Z4 2.5i, Z4 3.0si
  • E85 Auto - Z4 2.5i, Z4 3.0si, Z4 2.5si, Z4 2.5si (SMG), Z4 3.0i
  • E85 Alpina Z Roadster S 3.4
  • E87 Manual - 130i
  • E87 Auto - 118d, 120d (03/07 - 09/08), 123d, 130i
  • E89 Manual - Z4 sDrive 23i
  • E89 Auto - Z4 sDrive 23i, Z4 sDrive 30i
  • E90 Manual - 320d (with final drive 7591074), 320i (with 188k casing), 325i (with final drive 7591015), 328xi, 330i
  • E90 Auto - 320d (with final drive 7591017), 320i (with 188k casing), 325i, 328i, 330i, 335i (with final drive 7572055), 335xi
  • E92 Manual - 325i (with final drives 7529109, 7591015), 328i, 330i
  • E92 Auto - 320d (with final drive 7591017), 325i, 328i, 330i, 335i (with final drive 7572055), 335xi
  • F10 Manual - 535i
  • F10 Auto - 535i
Perfect for your fast road or track BMW

We can also fit this unit into your existing diff casing, fully rebuilt with new bearings and seals
 
Free postage for UK mainland only.


Helical LSD Advantages:-

  • Equal rotational speed to both wheels
  • Torque distributed according to traction
  • Minimal service requirements - no clutches
  • Quick reaction compared to viscous LSDs
  • Gentle and progressive engagement, low noise
  • Easily controlled power take-off and drifting
  • Direct replacement into stock differential
  • Gears and body manufactured from 8620 alloy steel

  • Helical LSD's - How They Work
The Blackline helical LSD's are torque biasing, that is they distribute torque between the wheels, loading more torque towards the wheel with the best traction thus improving performance and driveabitily. Especially in low grip situations.The helical gearing manages the distribution of friction within the LSD. When torque is applied to the helical gear system it creates force that pushes the gear into the differential body, thus creating friction. Increases of torque, increases the thrust force directly proprotional to the amount of torque. This allows the Blackline LSD to cope with considerable traction imbalance even under heavy power conditions, as would be the case on exiting a powered up corner. But at low torque conditions the LSD can differentiate quietly and smoothly, thus making the differential very suitable for normal road driving.  They are designed with a torque bias of 5:1 this means that if  one wheel loses traction then the wheel with the most grip can receive five times as much torque as the wheel that is slipping. 


About 2Spec Transmissions

 

We design, manufacture and building of competition Transmissions and drivelines. We design and deliver whole Motorsport Transmissions, competition axles, gear kits or Individual components, as well as design and supply bespoke gears or reverse engineered parts with modern engineering practices improving quality and performance.

We work closely with you the customer ensuring the product is designed manufactured and tested too your requirements for ultimate reliability and peace of mind.

We also put this expertise into servicing or rebuilding your gearbox, be it a full race unit or for your classic road car. Detailed strip down and consultation is followed by careful assembly and testing, all detailed in your personal online service book which we create for your driveline unit. 


We are based in Kenilworth, Warwickshire close to the M40. 


Any questions please do not hesitate to contact us