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**CUSTOM/10** · 06-20-2015, 09:23 AM

So the next thing I decided to tackle was changing my gears from 3:08 to 3:73's. My rear end has a 3 series eaton posi in it and I wanted to keep it so a while back I purchase a set of 3:73's ( Thick set gears ) for a 3 series carrier that a board member had for sale. Now prior to ordering any additional parts I needed to determine if the posi needed to be rebuilt. After searching the internet I found that the posi should have a minimum of 30 up to 70 ft lbs of break away torque. If it was 30 or less it would need to be rebuilt. So I made a jig to go on my wheel studs that allow me to use my torque wrench to determine
were it was. The opposite needs to be on the ground and you slowly put pressure on the torque wrench watching the needle until the posi slips. I came up with 40 ft lbs so I'm going to leave it alone. Here are some pictures, that may help if anyone else needs to do the same.
Next I'll tear the rear end down and order what's needed. The rear end rebuild will be coming soon.

Gary

06-20-2015, 09:23 AM	#558
CUSTOM/10 Senior Member Join Date: May 2003 Location: Sandown, NH Posts: 2,797	Re: Project; Divorce Therapy ( 72 SWB 4x4 ) So the next thing I decided to tackle was changing my gears from 3:08 to 3:73's. My rear end has a 3 series eaton posi in it and I wanted to keep it so a while back I purchase a set of 3:73's ( Thick set gears ) for a 3 series carrier that a board member had for sale. Now prior to ordering any additional parts I needed to determine if the posi needed to be rebuilt. After searching the internet I found that the posi should have a minimum of 30 up to 70 ft lbs of break away torque. If it was 30 or less it would need to be rebuilt. So I made a jig to go on my wheel studs that allow me to use my torque wrench to determine were it was. The opposite needs to be on the ground and you slowly put pressure on the torque wrench watching the needle until the posi slips. I came up with 40 ft lbs so I'm going to leave it alone. Here are some pictures, that may help if anyone else needs to do the same. Next I'll tear the rear end down and order what's needed. The rear end rebuild will be coming soon. Gary Attached Images __________________ Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 Last edited by CUSTOM/10; 06-20-2015 at 09:28 AM.