Nick - Axle Clarrification


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Posted by Vaughn [99.104.68.175] on Monday, December 23, 2013 at 12:18:27 :

I’m posting a new post since your post is getting pretty far down.
Ok, best I can determine is that the first axle housing you bought is the 1st series ¾ ton using an 8-3/4 ring gear. The second axle housing from Ed is a 2nd series ¾ ton, unmodified axle housing, using the 9-5/8 ring gear.
Now here’s where it gets important. Since I didn’t see any stud ring/tag welded to the axle housing as you would see with a 3rd series axle housing, spacing for the third member is critical. Since the housing spacing (distance) between the rear inspection cover’s machined surface, and the 3rd member’s machined surface is identical between the ½ ton and the ¾ ton axle housings, you must compensate to correct the axle’s center line. Installing the 9-5/8ths, 3rd member in the housing pushes the axle’s center line 1/16th more to the rear of the axle housing since it is a larger unit. Failure to make a correction in the center line will result in additional stress on the axles and their breaking over time.
Since you have a 2nd series “unmodified housing,” you can do two things:
• When installing the 3rd member, use three gaskets.
• Have a 1/16 thick metal ring made by using a 3rd member gasket. When installing, use a thin layer of silicone between it and the housing. Use no sealer on either side of gasket, gaskets are self-sealing.
My preference would be to have the ring made. I don’t like too much soft material between parts as it can result in some distortion. Of the two housings you have, I would use Ed’s, since it requires no drilling to install 7/16th studs for the 3rd member. Clean it up, make your decision on compensation, assemble it, and install.




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