Not Ranked
In the case of a 447 in FE engine---yes and the clock is ticking with every clutch release
And the strength difference between a 1350 spl series joint and one of your greasable ones of whatever size is way more than 5%--the torque capacity of a greasable joint is probably more than 5% depending on whether you have the zerk hole in compression or not---I've seen several driveshaft failures and they were mostly all well lubed
Its your choice and yours alone on what you choose but I hope that this exchange has opened some eyes as to choices to be made other than ""shall I get the $8 joint or the $25 joint?"
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