With the 1.8 diffs, while the half shafts are not the same as the 1.6, they were again two piece until sometime in 1995 at which point Mazda moved to one piece half shafts. Note that all the 1.6 diffs came with two piece half shafts, that being a pair of stub shafts in the diff and then half shafts to the hub with a bolted flange to join them together. So a 1.6 diff needs 1.6 driveshaft and half shafts, and the 1.8 diff can be installed in any NA or NB, even a 1.6 powered car, provided the associated 1.8 driveshaft and half shafts are installed. ![]() The differentials very similar and are interchangeable - provided the associated driveshaft and half shafts are also swapped. Mazda knew they'd made a mistake with the 6" gear, so when the 1.8 litre engine arrived in late 1993, they moved to a larger and stronger diff with a 7" ring gear - this time derived from the RX-7 of the 80's. It was actually derived from the rear of the 1988 Mazda 323GTX which has roots that date back to the late 70's. ![]() The first MX-5 diffs that originally came with all the 1.6 litre engined cars were equipped with what is the smaller and inferior 6" ring gear (they are know to spontaneously explode).
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