AXLE ID NEEDEd
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Senior User
Joined: Dec 2007
Posts: 383
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From: PLANT CITY, FL
i was replying while u were thanks alot for ur help tho how do i get this measurement with the nut off? Maybe i dont understand how the measurement is taken i thought it was via turning the nut
Elder User
Joined: Oct 2004
Posts: 855
Likes: 5
Yes, you are turning the nut, but you have to have the axle off the ground so the tires are not touching the ground anymore. You are simulating the input power of the driveshaft. There is a certain amount of preload, or deliberate pressure on the pinion bearing, the resistance of which can be measured. By turning the nut, all you want to do is rotate the whole axle assembly, measuring how much force it takes to turn it. There are two different measurements on the pinion nut. One, is the force applied to crush the crush sleeve, and this is in the hundreds of foot pounds(this is measured with the yoke blocked so it can't rotate. The second, is the force required to rotate the yoke after the nut has been run down and the crush sleeve crushed This measurement is typically only a matter of a few inch pounds. As described earlier, this is done with the axle assembly free to rotate.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
It looks like my attachment got cut short. I meant to include more info. I'll add these. After a quick review it looks like 20 in lbs. is what you're looking for. Hopefully miker67 can confirm this
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Senior User
Joined: Dec 2007
Posts: 383
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From: PLANT CITY, FL
10 4 thanks alot guys if u have any more input love to hear it otherwise I will try to get to project tonight and update tomm
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Elder User
Joined: Oct 2004
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20 inch pounds sounds correct. That was the number I had in my head, but I didn't want to say without verifying it. The first PDF file has all the steps you should need, but I would suggest you read the other two carefully as well. It will help give you an understanding of how the differential is assembled, so that the whole preload/rotational torque concept makes more sense.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Yeah, but 20 in-lbs is with just the pinion installed, and doesn't take into account the preload on the carrier bearings and drag from anything else installed. Unfortunately it is critical to take the measurement before hand. However, it takes a HUGE amount of torque to crush the sleeve altering the preload. In these cases, torquing the poinion nut down to 50 to 75 lb-ft is adequeate and won't mess the preload. You can also check it because it should remove all of the lateral lash from the pinion.
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