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Hi guys I appreciate this is a reasonably discussed topic across the various forums, but the information is a bit dispersed and some of it slightly old. I was hoping to perhaps collate the different options and people's experiences together on this subject. Essentially I'm looking at an LSD conversion project for my '97 540iT. Reasoning for which, is in part, to prepare car for a SC install. Just to add that I'm currently unable to carry out any of the work myself so I'd be relying on either my indy or diff specialist garage. There are, from my research so far, three obvious options available. I'd appreciate anyone's thoughts/experiences on having carried out any of them, or indeed any other options: 1. Swap internals of OEM open diff for those from an E36 M3 EVO LSD. 2. Swap diff for E39 M5 LSD. This requires a little more work, including modifying the driveshaft, which will need rebalancing. https://www.bimmerforums.com/forum/showthread.php?1767892-E39-M5-limited-slip-differential-swap-into-an-E39-540i 3. Purchase a third party torsen type LSD suitable for the E39. For example: Quaife - UK based company, with a good reputation, from what I've anecdotally heard. Takes less than a day to have the unit swapped. https://shop.quaife.co.uk/quaife-bmw-limited-slip-differential-kit-for-5-series-e39-540i-manual Wavetrac - Based in the USA, so hassle, buying, customs, etc. OS Giken - Japanese based. As such, much more expensive. Bit overkill perhaps, unless you're die hard track enthusiast; I may do the odd hill climb in my touring, but it's not going to get a roll cage and go on the track every week. I guess option 4 is to do both, swapping the final drive for an Msport E36/E39 AND replace the diff for a third party torsen type LSD. Pros of swapping in an E36 or M5 diff: You're swapping the entire final drive unit, so beefier parts, which may well be useful putting the extra horses to the wheels, and you're getting the Msport ratios. Cons of swapping in an E36 or M5 diff: Old LSDs will have an uncertain history, and will often have been taken out of their original cars for a reason. Granted it can be reconditioned, but old ZF design LSDs with only half a dozen clutch plates aren't a great design, compared to more modern variants, and will require a reasonable amount of work to fit into existing subframe and shafts. Even newer BMW LSDs (E46 and upwards), which use the M-variable diffs, which have many more clutch plates, have known issues with weak spur gears. Pros of putting in a new third-party LSD: You know your final drive is working and probably have a history of its use and maintenance. Still able to replace output bearings if damaged (although unlikely). Torsen type LSD, uses gearing rather than clutch plates to provide power. ASC/DSC guaranteed to still work (albeit less likely to kick in as the LSD will be doing a lot of the work). Cons of putting in a new third-party LSD: Retain original crown wheel and pinion and therefore original non Msport ratios (although I imagine this isn't too noticeable - would appreciate any experience of this). I guess I think I've already made up my mind, but I would be interested to get people's thoughts on the forum. Thanks in advance.