Cab there are some guys that have them in street cars that hold up fine unless you whoop on it with good traction. The gears do look pretty wimpy even compared to 23 spline gears. I would put one in a easy driving B-body and even if you do break it parts are plentiful and cheap shruggy

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64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60