The OPM limited-slip is a patented clutch-type custom made limited-slip differential. We start with a stock diff and remove all the gears and shafts to inspect and clean them. Then machining of the case is performed and the clutch packs are fit. The diff is then re-assembled and a spring block is pressed between the spider gears to put pressure on the side gears.

It works extremely well and has a long operation life. We have units in use in Solo, Improved Touring, Rallye, Ice Racing and high-performance street applications.

In comparison, the Quaiffe LSD is a gear-type unit. It is heavier than the OPM unit (like a heavier flywheel) and also has to re-engage if one of the wheels loses contact with the street or racing surface.

The Phantom Grip LSD is an incomplete copy of an OPM unit. It has the spring block, but no clutches so it wears out the diff housing. Dollar for dollar, the OPM unit is your best bet.

Product prices are subject to change without notice.

Products are sold and/or installed without warranty expressed or implied. No warranty or representation is made to any products ability to protect the user from injury or death. The user assumes all risk.

No returns will be accepted without prior authorization. We cannot accept returns on special order parts. A 25% restocking charge will be assessed to each return.

We ship daily by UPS. Other arrangements can be made upon request.

Payment can be made by VISA, MasterCard, Discover or COD ($10.00 COD fee). We can also accept money orders or Cashier's Check prior to shipping.