Hi Mike. GM-SI Doc#s 442289 @ 423658 gives: Upper-18 lb/ft with 12345382 tread locker.

Lower-four steps 1-vert. 63 lb/in. 2-diag. 63 lb/in. 3-vert. 115 lb/in. 4-diag. 18 lb/ft. no treadlock indicated

Hope this helps. Seems like I have seen some after-marke... Login to read more.