Changing rearend gears to posi - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**67ChevNut** · 11-27-2012, 03:28 PM

Ok guys, hope somebody can help me. I have two 12 bolt rearends, one from a 1964 4x4, and one from a 72 c10. The c10 is a 5 lug rearend and the other one is a posi rearend. I want to change the whole gear housing from the 64 rearend to the 72 rearend, but the 64 rearend is not turning at all. I am thinking it may be due to the fact that this rearend is been without use for more than a few years. Any ideas as to what I can do to make it turn?

Also, how do post pics from an ipad?

Appreciate your help.

Posted via Mobile Device
Posted via Mobile Device
Posted via Mobile Device

Littletony · 11-27-2012, 03:41 PM

Does it still have the brake drums on it? If so take those off and see if that helps.

**67ChevNut** · 11-27-2012, 04:37 PM

No brake drums in place.
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Rochlow · 11-27-2012, 05:47 PM

Take the diff cover off to see what is stop the axles from turning.

To post pic from Ipad there is a mobile photobucket app you can use.

**67ChevNut** · 11-28-2012, 11:06 AM

I believe I found the problem, the passenger axle is shut and won't move at all. The other side tries to move, but that one won't move a bit. I guess I'll try some WD-40 and try to force it to move.

**67ChevNut** · 12-13-2012, 01:03 AM

Just found out my 64 Posi gears are 17 spline. My 72 rearend has 30 spline axles. I want to use the Posi gears on the 72 rearend, but the 30 spline axles won't fit. What are my options here?

Should I get a machine shop to redrill my 17 spline axles to 5 lugs, or are there 5 lug 17 axles from other 12 bolt rearends that interchange?

Should I consider other options? Thanks guys.
Posted via Mobile Device
Posted via Mobile Device
Posted via Mobile Device
Posted via Mobile Device
Posted via Mobile Device

midniteblues · 12-13-2012, 09:16 AM

a long time ago I tried getting 6 lug axles redrilled for five lug.
the center locater has to be turned down (thinking either 1/8" or 1/4")its larger than the 6 lugger.
after turning the center down a stud hole or two intersected with the 5 lug pattern.
my machine shop wouldnt fill the holes and redrill them for liability reasons. others might do it I was told too send them too moser but that was more than I wanted too spend and would've almost came close too the same price as new axles.

you might be better off selling what you have and getting excatly what you need(I should take my own advice

) other than that I'm sure you could buy the axles that you need

**67ChevNut** · 12-14-2012, 01:10 AM

Hey, thanks for the reply, that's good info. I may have to forget about this Posi unit and install the 72 open gear rearend. Is 3:73 gears too so it isn't so bad, really wanted the Posi though.
Posted via Mobile Device

11-27-2012, 03:28 PM	#1
67ChevNut Active Member Join Date: Mar 2009 Location: Eagle Pass, Posts: 195	Changing rearend gears to posi Ok guys, hope somebody can help me. I have two 12 bolt rearends, one from a 1964 4x4, and one from a 72 c10. The c10 is a 5 lug rearend and the other one is a posi rearend. I want to change the whole gear housing from the 64 rearend to the 72 rearend, but the 64 rearend is not turning at all. I am thinking it may be due to the fact that this rearend is been without use for more than a few years. Any ideas as to what I can do to make it turn? Also, how do post pics from an ipad? Appreciate your help. Posted via Mobile Device Posted via Mobile Device Posted via Mobile Device

11-27-2012, 03:41 PM	#2
Littletony Registered User Join Date: Sep 2010 Location: Jacksonville, NC Posts: 596	Re: Changing rearend gears to posi Does it still have the brake drums on it? If so take those off and see if that helps. __________________ "Some people spend an entire lifetime wondering if they've made a difference. The Marines don't have that problem." President Ronald Reagan,1985 "The Marines I have seen around the world have the cleanest bodies, the filthiest minds, the highest morale, and the lowest morals of any group of animals I have ever seen. Thank God for the United States Marine Corps!" ..............Eleanor Roosevelt, 1945

11-27-2012, 04:37 PM	#3
67ChevNut Active Member Join Date: Mar 2009 Location: Eagle Pass, Posts: 195	Re: Changing rearend gears to posi No brake drums in place. Posted via Mobile Device

11-27-2012, 05:47 PM	#4
Rochlow Registered User Join Date: Aug 2006 Location: St. Albans, Vt Posts: 2,520	Re: Changing rearend gears to posi Take the diff cover off to see what is stop the axles from turning. To post pic from Ipad there is a mobile photobucket app you can use.

11-28-2012, 11:06 AM	#5
67ChevNut Active Member Join Date: Mar 2009 Location: Eagle Pass, Posts: 195	Re: Changing rearend gears to posi I believe I found the problem, the passenger axle is shut and won't move at all. The other side tries to move, but that one won't move a bit. I guess I'll try some WD-40 and try to force it to move. Attached Images

12-13-2012, 01:03 AM	#6
67ChevNut Active Member Join Date: Mar 2009 Location: Eagle Pass, Posts: 195	Re: Changing rearend gears to posi Just found out my 64 Posi gears are 17 spline. My 72 rearend has 30 spline axles. I want to use the Posi gears on the 72 rearend, but the 30 spline axles won't fit. What are my options here? Should I get a machine shop to redrill my 17 spline axles to 5 lugs, or are there 5 lug 17 axles from other 12 bolt rearends that interchange? Should I consider other options? Thanks guys. Posted via Mobile Device Posted via Mobile Device Posted via Mobile Device Posted via Mobile Device Posted via Mobile Device Attached Images

12-13-2012, 09:16 AM	#7
midniteblues Registered User Join Date: Jul 2011 Location: strausstown pa Posts: 3,394	Re: Changing rearend gears to posi a long time ago I tried getting 6 lug axles redrilled for five lug. the center locater has to be turned down (thinking either 1/8" or 1/4")its larger than the 6 lugger. after turning the center down a stud hole or two intersected with the 5 lug pattern. my machine shop wouldnt fill the holes and redrill them for liability reasons. others might do it I was told too send them too moser but that was more than I wanted too spend and would've almost came close too the same price as new axles. you might be better off selling what you have and getting excatly what you need(I should take my own advice) other than that I'm sure you could buy the axles that you need __________________ 81 camaro 355 4/spd 342 posi my first love. 67 swb step 454/4spd ott 373 posi 4/7 drop. 2000 s10 zr2 little blue truck that never gets stuck. '74 heald super bronc vt8. tecumseh powered moon rover.

12-14-2012, 01:10 AM	#8
67ChevNut Active Member Join Date: Mar 2009 Location: Eagle Pass, Posts: 195	Re: Changing rearend gears to posi Hey, thanks for the reply, that's good info. I may have to forget about this Posi unit and install the 72 open gear rearend. Is 3:73 gears too so it isn't so bad, really wanted the Posi though. Posted via Mobile Device

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