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My buddy Mike went [Email]10.0@129[/Email] with them in his Valiant. 904/brake/2700#.

It's more than just the u-joint size that's involved. You have to look at the driveshaft size ( diameter ) also. Often you have to go to a 3.5" dia shaft to stay out of the critical speed zone, and that warrants bigger u-joints so the yokes match up to the shaft properly. If I have to go to a 3.5" shaft ( or larger ), I sure would'nt want to neck it down at the yokes to accommodate smaller u-joints. I must say, it seems there were a lot more u-joint failures in the 60's than there is today, so somethin had to get better.

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