I had a customer bring in some 8 3/4 rear end he wants me to swap gears and Sure Grips etc. No problem there. He also brought his axles so I can press on some new Green bearings. All set there. he also brought some Moroso 3" axle studs to install. Problem is, they dont fit. I dont ever do stock axle stuff, so maybe there is an explanation someone can provide. The Moroso stud ( knurl) diamtere is about .680 . The axle holes are about .640 . Is this common, and is there a replacement stud that fits, or will I have to simply bore out the axles? I know its an easy fix, but just looking to see if there is a drop in stud available to save this guy some labor time.To do it right I'd bore them or ream them, so its not just a quick drill.


Sent Dr Diff an email but didnt hear back, so hoping someone here may know.
FYI, these axles are off a 65 Coronet, 413 4 speed car. Didnt know if they maybe had two different axles over time. Thanks.

I dont know the actual dimensions, but that sounds about right. The replacement studs have to be Drawn in, they are not a slip fit. So a .020 thousands knurl dimension isnt that big IMO.

When I changed even stock studs , I would install them one at a time from the back. Use a bigger bolt spacer and draw All them in with the studs bolt untill you see that they are all seated.

He just got the wrong knurl size... I believe there
is 3 different sizes for mopar axles

The only long, press-in stud with the correct knurl size is a Mr Gasket product (MRG-4311).

You must enlarge the holes with a 43/64" bit to install Moroso studs.

BTW, I did not receive an E-mail from you.

Thanks Cass. I ended up just doing that anyhow, a little tight for press fit, but with CMP, it pressed in ok. He already had bought the studs, so I was trying to use what he had instead of making him buy more.

I'll check the email. I went and googled your site, then used the contact info link on there. Cant re-call the address, but I'll pull it back out of email in case something isnt working there.

Thanks.