Just finished swapping out the control arm bushings on my '93 4x4 in preparation for the Blazeland long travel. Looked all over the internets, even went to my colleges auto tech shop looking for the upper control arm cross shaft nut torque. They are 27mm nuts with The "crush it on the corner of the threads" ones. All I've been able to find is the "wrench it on good and tight" type torque numbers. Anybody know a little more specific number?

 

I have not come across the spec for this assembly. The cross shaft and companion flange nut are 18mm x 1.5 not 27mm? I use a 1-1/16" socket on the nut (maybe this is 27mm socket/wrench?) Here is a link for some torque specs for 18mm bolts http://www.dansmc.com/torque_chart.htm As you can see its dependent on the grade of the bolt. For low grade, the spec is 60-130 lb/ft for Grade 8.8 its 201 lb/ft. I suspect the cast steel cross shaft is less than Grade 8.

When I re-assemble after the rebuild I estimate a torque spec of 75-100 ft/lb. I also use a blue thread lock compound and stake the companion flange nut. When you perform a poly bushing conversion the bushing is free floating and non-binding. This means the bushing is free to rotate on the inner steel sleeve or outer steel shell (unlike the factory rubber bushing that twist the rubber bonded to the inner steel sleeve and outer steel shell) so it doesn't need to be as tight. The nut is locking the inner steel sleeve to the cross shaft. Hope that helps, and gives you some peace of mind.

 

166 ft-lbf

http://personal.utulsa.edu/~nathan-b...27frontsus.pdf

1-1/16" = 26.9875mm

 

Ahhh! That's awesome! Everything indeed in one handy document, all at the tip of my fingers!