Loose Pinion
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Senior User
Joined: Aug 2012
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From: Corvallis, OR
Loose Pinion
Hey all. Got under the truck yesterday to look at replacing the pinion seal and some u-joints.
When wiggling the pinion around i get some play and wanted to know if this was acceptable.
Ford 9" out of a 72 F100.
Is it possible to change the pinion bearing and seal without re-setting up the gears?
When wiggling the pinion around i get some play and wanted to know if this was acceptable.
Ford 9" out of a 72 F100.
Is it possible to change the pinion bearing and seal without re-setting up the gears?
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Senior User
Joined: Aug 2012
Posts: 252
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From: Corvallis, OR
Tonight I will pull the axles and check the rotating torque on the pinion nut. Should be within 6-15ft/lbs? That should tell me if its loose.
I need to pull the whole third member, because its leaking left and right.
My main question is can I pull the pinion carrier. Replace the pinion bearing, seal and crush sleeve. Without messing up backlash.
I need to pull the whole third member, because its leaking left and right.
My main question is can I pull the pinion carrier. Replace the pinion bearing, seal and crush sleeve. Without messing up backlash.
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Senior User
Joined: Aug 2012
Posts: 252
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From: Corvallis, OR
I found ultrarangers post earlier when searching. That actually helped me order the correct bearings. Now I need to figure out what bearings I need to replace the pinion bearing and seals.
Inner and outer bearings. Seal, new crush washer, and new pinion nut?
Anything else?
Inner and outer bearings. Seal, new crush washer, and new pinion nut?
Anything else?
Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
You should be able to unbolt the pinion carrier and "unscrew" it from the ring gear. Giving you free access to replace the bearings/seal.
The rotating spec is just the pinion, not including the ring gear so you have to remove it to check it. With it being so loose, I guess it is a moot point. You will just have to replace the bearings/crush sleeve/seal and then torque the nut back to 13-15 in/lb rotation.
It should not mess with backlash, as the pinion is pulled down on the large bearing and that sets your pinion depth. Since that isn't going to change for the most part you should be able to rebuild it and re install it without messing anything up.
Make sure you keep track of any shims when you remove the pinion carrier. That sets your depth.
I replaced the pinion bearings on my 8.8 in my '89 without any fuss or having to change the side shims.
The rotating spec is just the pinion, not including the ring gear so you have to remove it to check it. With it being so loose, I guess it is a moot point. You will just have to replace the bearings/crush sleeve/seal and then torque the nut back to 13-15 in/lb rotation.
It should not mess with backlash, as the pinion is pulled down on the large bearing and that sets your pinion depth. Since that isn't going to change for the most part you should be able to rebuild it and re install it without messing anything up.
Make sure you keep track of any shims when you remove the pinion carrier. That sets your depth.
I replaced the pinion bearings on my 8.8 in my '89 without any fuss or having to change the side shims.
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From: Corvallis, OR
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Fleet Owner
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From: NorCal
Oy.... and there it is. There's the cause of the extreme backlash. I'm surprised the rear end wasn't howling like a bloodhound.
Yup, that's a known weak spot with Ford 9s... repro carriers from the likes of Strange and Currie add extra "meat" to support around that pinion bearing boss.
Yup, that's a known weak spot with Ford 9s... repro carriers from the likes of Strange and Currie add extra "meat" to support around that pinion bearing boss.
Fleet Mechanic
Joined: May 2001
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From: Cupertino
Oy.... and there it is. There's the cause of the extreme backlash. I'm surprised the rear end wasn't howling like a bloodhound.
Yup, that's a known weak spot with Ford 9s... repro carriers from the likes of Strange and Currie add extra "meat" to support around that pinion bearing boss.
Yup, that's a known weak spot with Ford 9s... repro carriers from the likes of Strange and Currie add extra "meat" to support around that pinion bearing boss.
Tell us OP, how did you do it?
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Senior User
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From: Corvallis, OR
Bad u joint.
https://youtu.be/ZUEZlzXhlV4
Lead Driver
Joined: Apr 2011
Posts: 6,399
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From: El Dorado, Arkansas
I put a factory '75 D0OW-B 9-inch N-case in my truck. --Daytona pinion support, 31-spline 4-pinion Traction-Lok differential with 3.50 gears.
After I cleaned it up.
My '69 C7AW-E single vertical rib 9-inch 3rd member the N-case replaced.
