What size to drill out axles for Moroso studs?

Bad89stang · 04-23-2004, 09:32 PM

I have some Moroso 3" wheel studs on the way but I understand that you have to drill out the axles to get them to fit. They are .625" knurl studs. Supposed to be the correct ones for my application.

'89 Mustang 5.0

Any input? I have searched like a mofo and have only come up with mixed results.

tireburner163 · 04-24-2004, 12:04 AM

Moroso studs SUCK. They're way too soft.

I had them in on my hatch for a while. You could just look at them wrong and they would cross thread.

Go ARP

If they're the stock size, just pound them in with a BFH.

-Josh, aka the tireburner

04-26-2004, 02:22 PM

I too have some Moroso 3in. studs sitting around...waiting for me to pull my axles, rebuild my diff. and install them. They look WAY TOO BIG for the stock stud holes. The difference in diameter, compared to the stock studs is huge. I don't even know if pounding the Morosos in with a sledge would do it?? I hope so!

Bad89stang · 04-26-2004, 08:44 PM

Someone over on the Corral told me 39/64" so I am going to try that. I'll let you know what happens.

~The Jester~ · 04-26-2004, 08:56 PM

If the studs are .625" I would go 1/2" hole first and see where that puts you. You can always drill too small and sneak up on it, but if you drill too big the first time.........

I drilled mine to 1/2" and then used a reamer. My thoughts were using a tapered hole would make them tighter the further in the hole they were. I also used a big thick flat washer and an OLD lugnut in lieu of the BFH, but either way will work. With the BFH, it's too hard to keep the stud straight.

Jeff Chambers · 04-27-2004, 06:46 AM

Yep, 39/64" will give the proper interference fit.

Bad89stang · 04-27-2004, 06:46 PM

Thanks, I'll give it a shot.

Edit: AAAAGGGGGHHHH! Just got the studs in the mail today and they are .615" knurl diameter. Part number 46180. Is this the right part number for my application? Do I still drill out the axles to 39/64"?

04-23-2004, 09:32 PM	#1
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	What size to drill out axles for Moroso studs? I have some Moroso 3" wheel studs on the way but I understand that you have to drill out the axles to get them to fit. They are .625" knurl studs. Supposed to be the correct ones for my application. '89 Mustang 5.0 Any input? I have searched like a mofo and have only come up with mixed results.

04-24-2004, 12:04 AM	#2
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	Moroso studs SUCK. They're way too soft. I had them in on my hatch for a while. You could just look at them wrong and they would cross thread. Go ARP If they're the stock size, just pound them in with a BFH. -Josh, aka the tireburner __________________ 1987 Buick T-type 1998 HD Electra Elide

04-26-2004, 02:22 PM	#3
Simi Stang Guest Posts: n/a	Moroso studs I too have some Moroso 3in. studs sitting around...waiting for me to pull my axles, rebuild my diff. and install them. They look WAY TOO BIG for the stock stud holes. The difference in diameter, compared to the stock studs is huge. I don't even know if pounding the Morosos in with a sledge would do it?? I hope so!

04-26-2004, 08:44 PM	#4
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	Someone over on the Corral told me 39/64" so I am going to try that. I'll let you know what happens. __________________ You're gonna need your seatbelt

04-26-2004, 08:56 PM	#5
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Sounds about right... If the studs are .625" I would go 1/2" hole first and see where that puts you. You can always drill too small and sneak up on it, but if you drill too big the first time......... I drilled mine to 1/2" and then used a reamer. My thoughts were using a tapered hole would make them tighter the further in the hole they were. I also used a big thick flat washer and an OLD lugnut in lieu of the BFH, but either way will work. With the BFH, it's too hard to keep the stud straight. __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

04-27-2004, 06:46 AM	#6
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Yep, 39/64" will give the proper interference fit. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

04-27-2004, 06:46 PM	#7
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	Thanks, I'll give it a shot. Edit: AAAAGGGGGHHHH! Just got the studs in the mail today and they are .615" knurl diameter. Part number 46180. Is this the right part number for my application? Do I still drill out the axles to 39/64"?

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