Dana 44 and 12 bolt 1/2” studs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Blazerowner** · 01-14-2019, 10:55 PM

So I have done a little research and found that possibly 610-219 Dorman studs will replace the 7/16 studs on a Dana 44. This would be a 72 k5 and I was thinking of upgrading. Apparently a drill will make it work. Has anyone else done this? Any other options? Also does anyone know what the part number is for 1/2” on the 12 bolt?

**kwmech** · 01-15-2019, 01:31 AM

I do it all the time for my customers running larger tires. You'll need 2 drill bits. One for the rotor and 1 for the hub. (don't know the sizes off hand) The 219 stud is a Ford F-150 4x application. I've even done a few 9/16'' conversions

rsavage · 01-15-2019, 07:45 AM

I just put some longer than stock 7/16" studs in my front hubs. The longer studs had a larger knurled shank but the closest smaller drill size was 37/64" which was only .005 smaller. I drilled the hubs but the new studs didn't seem like they went in hard enough. I believe that .007 - .010 is recommended. I ended up welding them to the hub on the back side as I didn't want to take the chance on them spinning in the future. Just piece of mind.

**Blazerowner** · 01-16-2019, 01:49 AM

I think the 9/16 studs would be overkill for me. I installed all new 7/16 studs when I rebuilt the diffs. I thought about converting them at the time but I wanted to get it together so I could roll it. It’s pretty easy to tear apart if need be so it’s on the list in the future. So those 219 studs work fine? I assume the hub is a slightly larger bit to clear the knurles on the stud?

**kwmech** · 01-16-2019, 11:33 AM

Quote:

Originally Posted by Blazerowner

I think the 9/16 studs would be overkill for me. I installed all new 7/16 studs when I rebuilt the diffs. I thought about converting them at the time but I wanted to get it together so I could roll it. It’s pretty easy to tear apart if need be so it’s on the list in the future. So those 219 studs work fine? I assume the hub is a slightly larger bit to clear the knurles on the stud?

Yes you have to drill both the hub and the rotor

Drill bit to drill out the hub is 19/32

Drill bit for the rotor is 41/64

**Blazerowner** · 01-18-2019, 12:51 AM

Definitely some oddball bits. I think I can get them from the local Ace hardware. They have a bunch of bit sizes. Thanks for the info on this.

01-14-2019, 10:55 PM	#1
Blazerowner Senior Member Join Date: Apr 2006 Location: Yuba City, Ca Posts: 1,955	Dana 44 and 12 bolt 1/2” studs So I have done a little research and found that possibly 610-219 Dorman studs will replace the 7/16 studs on a Dana 44. This would be a 72 k5 and I was thinking of upgrading. Apparently a drill will make it work. Has anyone else done this? Any other options? Also does anyone know what the part number is for 1/2” on the 12 bolt? __________________ Kirk 72 Blazer CST 4wd highlander

01-15-2019, 01:31 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,649	Re: Dana 44 and 12 bolt 1/2” studs I do it all the time for my customers running larger tires. You'll need 2 drill bits. One for the rotor and 1 for the hub. (don't know the sizes off hand) The 219 stud is a Ford F-150 4x application. I've even done a few 9/16'' conversions

01-15-2019, 07:45 AM	#3
rsavage Registered User Join Date: Aug 2009 Location: Alden NY Posts: 2,705	Re: Dana 44 and 12 bolt 1/2” studs I just put some longer than stock 7/16" studs in my front hubs. The longer studs had a larger knurled shank but the closest smaller drill size was 37/64" which was only .005 smaller. I drilled the hubs but the new studs didn't seem like they went in hard enough. I believe that .007 - .010 is recommended. I ended up welding them to the hub on the back side as I didn't want to take the chance on them spinning in the future. Just piece of mind. __________________ 1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7

01-16-2019, 01:49 AM	#4
Blazerowner Senior Member Join Date: Apr 2006 Location: Yuba City, Ca Posts: 1,955	Re: Dana 44 and 12 bolt 1/2” studs I think the 9/16 studs would be overkill for me. I installed all new 7/16 studs when I rebuilt the diffs. I thought about converting them at the time but I wanted to get it together so I could roll it. It’s pretty easy to tear apart if need be so it’s on the list in the future. So those 219 studs work fine? I assume the hub is a slightly larger bit to clear the knurles on the stud? __________________ Kirk 72 Blazer CST 4wd highlander

01-18-2019, 12:51 AM	#6
Blazerowner Senior Member Join Date: Apr 2006 Location: Yuba City, Ca Posts: 1,955	Re: Dana 44 and 12 bolt 1/2” studs Definitely some oddball bits. I think I can get them from the local Ace hardware. They have a bunch of bit sizes. Thanks for the info on this. __________________ Kirk 72 Blazer CST 4wd highlander



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