Jesse99James |
10-01-2023 12:34 PM |
Just another data point to consider in case you aren't aware. If you are looking for only the ring/pinion gears, you will have to setup them up yourself or pay for installation. A used differential WITH gears already installed fits all NA/NB except the Mazdaspeed or non-USA equivalent because of the larger axles. This Spring I had a new set of gears installed into my MSM diff. The local shop first quoted me around $650 (USD), then when I took it in 6-9 months later, the price jumped to $850. I asked about the difference but they said that's what they charge. Then there was some miscommunication as to when it'd be ready and I couldn't get back there for 8-9 days. Come to think of it, they failed to meet their quoted pick it up day twice. They charged $650 partially because they didn't need to install new bearings or press any on/off and possibly due to the miscommunication.
I purchased the gears here or off Miata.net from another Miata owner that sold his NB and moved to a newer Miata or another platform altogether. They were still $575 or more shipped and that was back in ~2020. Altogether you can expect to pay $1200+ if you cannot do your own setup of backlash and preload. You should also replace the axle seals, and if you're taking one apart, the input shaft/pinoin gear seal. Remember, gear oil STINKS, you don't want leaks. Sound like your cheapest option is having a 3.63 diff shipped to the USA but the price will only increase (shipping costs plus used diffs becoming less common).
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