Page 36 in this wheel catalog gives various torque specs for different lug nut sizes and mounting details.
http://www.accuridewheelendsolution...Accuride-Wheels-Product-Catalog-2015.pdf

5/8-18 varies from 130-200 ftlb depending on application
175ftlb might be about right.

Yes Tim, I recall them quite well. That was a long evening taking all those wheels off, backing of brakes, installing new front wheel bearings, and washing and greasing the rear bearings.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-