Proper torque for C4 Stub axles

[Joel K]

HI everyone. Happy Easter!

I know many have switched over to the x-tracker setup. I’ll probably do that at some point, but want to get to go-cart and inspection before I go down that road.

I’ve have a couple recommendations on an acceptable stub axle torque value between 120 ft-lbs to 200. My kit came unassembled so a number of the parts were shipped with documentation.

The instructions recommend to torque to 250 ft-lbs. That is higher than anything I’ve read on the forum. I’ll call the company during the week, but I always appreciate other builder’s feedback.

Torque recommended...

Install instruction...

Link to hub..

Wheel Hub Bearing Assembly 513020, BR930024, 7466924 / 7470502, : MIBearings LLC

MIBearings LLC Wheel Hub Bearing Assembly 513020, BR930024, 7466924 / 7470502, - Wheel Hub Bearing Assembly 513020, BR930024, 7466924 / 7470502,

mibearings.com

Link to a similar torque recommendation which appear to be custom C4 rear hubs...

Wheel Hub Bearing Assembly 513020, BR930024, 7466924 / 7470502, : MIBearings LLC

MIBearings LLC Wheel Hub Bearing Assembly 513020, BR930024, 7466924 / 7470502, - Wheel Hub Bearing Assembly 513020, BR930024, 7466924 / 7470502,

mibearings.com

 

[Johan]

Joel, I would say 250ft/lb. I recall that I had to borrow a larger torque wrench, my own ”big one” only goes up to 220ft/lb (300Nm), so 250 makes sense.

 

[Alex]

Ask the manufacturer. The torque on my 04 cobra rear axle nut is 250ft-lbs. The torque on a corvette rear axle nut (or effectively stock SL-C rear axle) is 118ft-lbs. If you over-torque you damage the bearings.

 

[Joel K]

Thanks guys, I sent a note to WBI, I’ll post their answer.

 

[Joel K]

FYI,

I confirmed with RCR to use the manufacturer torque specs for the hub bearing. Also confirmed with MI-Bearings for the set I have 250 lbs-ft is the correct spec so I’ll go with that. Going to torque them up this weekend.

 

[Brian Kissel]

Good to know. Thanks for confirming that Joel.

Regards Brian

 

[Howard Jones]

Here: https://www.corvetteforum.com/forum...eal-axle-nut-torque-specs-vs-shop-manual.html
or: http://www.zr1.net/forum/showthread.php?p=229825

Who knows?

My guess is a nice round number like 200, drive around for a 1/2 hour, and retorque. Then check for slop once a month. By the way that's what my C7 bearings are torqued to. I check them for torque before every track day and they have not loosened at all. 750 track miles on 345 Hoosiers (R) and no problems yet.