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Due to a change of plans I'm putting this up for sale It's a rare 3.6 ratio type-2 Torsen Torque biasing diff. Please ignore the fact it has 3.9 written on the carrier, i've counted to teeth on the crown wheel and pinion and it's definitely 3.6 Most MX5's came with either a 4.3 or 4.1 ratio diff, the 3.6 was only found on the 6-speed cars. Comparing with a 4.3 ratio this will give you an engine speed of approx 3100rpm in 5th gear at 70mph rather than 3600rpm. First gear will also be longer increasing from approx 30mph to 37mph @ 6200rpm. 60mph in second gear would now be possible. Further reading here http://www.miata.net/garage/diffguide/ http://www.torsen.com/products/products.htm http://www.flyinmiata.com/tech/gearing.php Visually the diff is in very good condition, I have removed the carrier to inspect the gear surfaces and there is no evidence of chips or damage. The diff has been reassembled, but is currently not filled with oil. For those that have the smaller diff fitted to the 1.6 cars (identifiable by having no torque damper on the diff nose and bolt on driveshafts) I also have spare a pair of push in driveshafts and a shortened prop of the correct length for a Westfield which I would sell with the diff. I'm offering this for sale at £300 for the diff only or £400 with the shafts and prop which is a lot less than I paid for it. I'm afraid it's too heavy for me to post, but I'm happy to wrap it for you to send your own courier or else collection in person from Colchester CO6 Thanks Mark firstname.lastname@example.org