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Old 04-28-2012, 11:02 PM   #1
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Torque spec pinion nut

So I have a new flange to mount to the front of my differential but in the installation guide it doesn't state the torque spec of the pinion nut that tightens down to the flange. Car is a 2011 mustang gt. thanks in advance.
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Old 04-29-2012, 10:25 AM   #2
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Old 04-29-2012, 12:28 PM   #3
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Re: Torque spec pinion nut

Doh....with 8.8s, there's a crush washer inside that settles right at the correct torque.

What I do with these rears is mark the pinion nut relative to the pinion shaft, # of threads visible and a relative orientation mark as well. I then put the nut back on where it came off and voila, no problemo.

If you haven't done this, you CAN'T put it back to the exact torque originally put on that nut, setting the crush washer. You could easily undershoot or overshoot the original torque spec and you're relying desperately on the torque spec from the factory to be at book specification, which may not be the case. This will create noise if you get it wrong and if left, munch the crown and pinion in short order.

Now, I can see this rear is an 8.8 but, I haven't worked on an S197 directly but, I assume all inside is largely unchanged from previous Mustangs w. 8.8s.
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Old 04-29-2012, 11:20 PM   #4
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No I haven't taken it off yet so that mark should work assuming the new flange and the old one r the same thickness. This is all for an aluminum drive shaft so I assume it would be thicker to maximize strength
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MOTM DEC 2011
Base SC Dyno 595rwhp/493rwtrq
Refined Tune 608rwhp/504rwtrq


Mustang history started with a 2000 v6, 2003 GT, 2007 GT, 2011 GT, all Black(coincidence)
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Old 04-30-2012, 09:43 AM   #5
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Re: Torque spec pinion nut

Flange thickness should not change (at least not at the place where the bolt seats). You'd need a custom longer pinion gear shaft then, as it's usually only 3-4 threads in from the end anyway.

Mark the nuts relative (clocked) orientation and carefully count the exposed threads. That should get you in the ballpark. This is standard stuff for replacing the regularly leaky pinion seal on 8.8.
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Old 05-22-2012, 07:45 AM   #6
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To close out this thread for anyone who runs into this problem when they install their driveshaft, my flange took 80 ft lbs of torque. Easiest way to find out is contact the company you bought the drive shaft from.
__________________
MOTM DEC 2011
Base SC Dyno 595rwhp/493rwtrq
Refined Tune 608rwhp/504rwtrq


Mustang history started with a 2000 v6, 2003 GT, 2007 GT, 2011 GT, all Black(coincidence)
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