GM Auto Transmission for Your V8 Miata: 4L60E, 6L80E, and 8L90E Compared
Choosing an automatic for a V8 Miata swap? Here’s how the 4L60E, 4L80E, 6L80E, and 8L90E stack up on fitment, electronics, and real-world usability.
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Ford 306 and T5 Into an NB Miata: What Your Build Thread Won’t Tell You
A carbureted Ford 306 with a T5 in an NB Miata is a proven combo — but the transmission choice will define whether it survives the first autocross season.