Okay weird thing number 2 : The nut actually turns like 1 full turn until it stops.
I marked in the following picture where the nut stops… i have no idea why it would stop all of a sudden even with a different nut… i see nothing on the pinion threads beside the first one that would make it stop
Looks like the top got banged with a hammer during pinion removal…thread chaser or a file to get the nut started and rolling
will try, thanks =)
True, the nut is 3/4" X 20 TPI (Fine thread) and you can buy a die for that thread on eBay. They are not cheap!
https://www.amkproducts.com/bulk-fasteners-products/?Product_ID=10471
Well filing the threads did nothing… i used gear oil to lbue the threads but the nut goes in only maybe one turn more and then stops again… I think my pinion is screwed
Not according to the photos. You won’t be happy with the gear noise of current 9” gears. Nothing like an original gear set. Per your earlier post, you could file off the hurt threads as long as the filed portion stick thru the nut when torqued, do all you can to save that gear
But the bottom of the nut goes past the bad thread, it goes in further than before and stops again…
What noise do the new ones make ?
Whining noises typically. Original gear sets produced by Ford are the only way to go. You need to completely eliminate the bad thread by making the top area into a taper. If you still have the original nut to use as a test piece that would also be better than using the one you over torqued with because it is definitely damaged. The gears threads are very hard and the nut is more malleable so make sure you toss the nut used to way over torque it
I’ve discarded the old, overtorqued nut, I now have the original one and a brand new one. I’m just afraid that the threads aren’t the problem but the whole shape of the stud is… like maybe it’s not round anymore or something, because the threads do look good even under a magnifying glass but the nut would be forcing it’s way down if I tried to screw it… As I said, it goes past the top threads when I screw it.
Don’t give up on it until you’ve cleaned up the threads by chasing with a die.
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A good lathe guy could chuck the pinion up , pick up the thread and fix the damaged area…where are you at
I wonder if you are running into the oblique section of the new nut. Or perhaps there is thread locking compound inside the nut.
France… so i think i’m on my own lol
I’m not sure… two different nuts for the same result. Maybe the whole shape of the shaft is messed up. Not by much so I can’t see, but enough to make it unusable
I think you can order from AMK in France so at least you will own a nut. I bet you have machine shop services and dies available too but no idea who or what they would charge.
I found a machine shop less than two hours from me. I’ll just give it to them and pay the price. If I can save my pinion I’d be relieved.
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