1970 C10 Longbed 2 Pc Driveshaft Bolt Torque 1/2"-20

[Gromit]

I'm stuck - cannot find the torque spec for the 1/2"-20 bolt that holds the bolt-on yoke to the splines of the two piece driveshaft / propeller shaft at the center support on this truck. (Not the nut at the rear pinion, but the BOLT at the center support yoke to driveshaft) Maybe this is a 1970 C10 longbed thing only; because I can't find anything about it.

I searched the forum, checked the Chilton, Checked the Haynes and Googled it to kingdom come and am at a loss.

Standard torque for a 1/2"-20 fine thread Grade 5 bolt like this is max about 100 ft lbs. But I don't think it was that tight when I took it apart.

Also this torque may affect the center support bearing so I would like to get it right.

Here is a photo that bollybibs put up a while back it is the bolt near the right edge of his photo - (it would have been more polite to ask him first if I could use his photo but I'm hoping he will understand when it is Sunday and you want to just get the rig together - Thanks Bollybibs!!)

Thanks for listening