Rear end flange

[chargerguy111]

How tight do I need to tighten the nut that holds the flange on my rear end?Thanks!

[Ghoste]

It depends on what rearend you have.
For a 1969 selection, there is the
7.25 - 240 ft lbs
8.75 (741 and 742 case) - 240 ft lbs
8.75 (489 case) - 170 ft lbs
9.75 - 250 to 270 ft lbs

[John_Kunkel]

8.75 (741 and 489 case) - 240 ft lbs

There is no set torque for the 489 with a crush sleeve, the nut is tightened until the proper bearing preload is reached with 170 ft. lbs. being the minimum.
The 742 gets 240 ft. lbs.

[Chatt69chgr]

Hey John-------what about the 489 where you are substituting the solid spacer and shims for the crush sleeve.?  Would it be 240 ft-lbs also?  And how do you hold the pinion still to tighten the nut to than kind of torque?  Do you make a plate to attach to the flange and attach a long piece of pipe to it?  Come to think of it, where do you get a torque wrench that measures 240 ft-lbs?  Seems like most I have seen just go up to 150.

[Ghoste]

Sorry John, had those two backwards, fixed now.

[firefighter3931]

Are we talking about the yoke or the bearing retainer that holds the axles to the flanges ?



Ron

[John_Kunkel]

Hey John-------what about the 489 where you are substituting the solid spacer and shims for the crush sleeve.?  Would it be 240 ft-lbs also?  And how do you hold the pinion still to tighten the nut to than kind of torque?  Do you make a plate to attach to the flange and attach a long piece of pipe to it?  Come to think of it, where do you get a torque wrench that measures 240 ft-lbs?  Seems like most I have seen just go up to 150.

Without a crush sleeve the 489 with a 1 1/4" hex nut would get the same 240 ft. lbs. torque as the 742 but some 489 pinions have the smaller 1 1/8" nut which should only get 180.

In the absence of a dedicated holding tool, some like to use a big pipe wrench around the yoke, braced against the ground when tightening the pinion nut. 1/2" drive torque wrenches are available that go to 250 ft. lbs. but the 3/4" drive wrenches handle that easily.

[Chatt69chgr]

OK.  Thanks John.  I have two different 489's.  One has the small nut and one the large.  I think the difference was that one was 10 spline and the other was 29 spline.  I appreciate the info on the torque settings. 

Didn't think about the 3/4 inch torque wrench.  Of course that will do just fine.  I will need to round one up.  Again, thanks.

[Nacho-RT74]

Nice info !!! I will deal with that soon.