Eaton Rear axle pinion seal. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

prg machine · 05-11-2009, 11:39 AM

Has anyone changed the pinion seal on one of these? After I remove the Yoke does the seal come out with the front retainer plate?

**Yukon Jack** · 05-11-2009, 03:02 PM

When I thought my pinion seal was leaking I posted this thread that will help you out - ended up not being a pinion problem for me so I didn't have to do anything further.

hicktownhotrodder · 05-11-2009, 04:37 PM

i have done this on my rear end. as i remember, it does not come out with it. its a real easy swap.

Wrenchbender Ret · 05-11-2009, 05:52 PM

After removeing the yoke remove the retainer & you can replace the seal in the retainer. It takes a thick cork gasket behind it but you can use a thick bead of RTV.

prg machine · 05-13-2009, 11:42 AM

sounds like 2 different answers. If I got it......I remove the yoke.....remove the retainer and the seal is pressed into the retainer and I have the retainer out to take to do it at the work bench???

Shaky · 05-13-2009, 04:49 PM

It's really worth getting your paws on an Overhaul Manual if you can.

prg machine · 05-13-2009, 08:04 PM

I have shelves full of manuals and lotsa wrenching experience. I always ask before I dive in anyway.

hicktownhotrodder · 05-13-2009, 09:41 PM

Quote:

Originally Posted by hicktownhotrodder

i have done this on my rear end. as i remember, it does not come out with it. its a real easy swap.

no. my bad. Wrenchbender Ret was right. take the retainer out and the seals in there

prg machine · 05-14-2009, 12:58 AM

Thanks a bunch guys. Now to order up the seal and get the pen oil out and let it soak up.................I have had to use a chisel as a driver to get some of these nuts loose before on the Jeeps when things got brutal.......then just replace the nuts since they are not that expensive.

prg machine · 08-22-2009, 01:34 PM

Finaly got tired of the leak so I called and there were 2 seals at the store . 20 bucks. Now to get around to actualy doing it!!!! Who has had to actualy do the speedy sleave repair and how much of a pain is that if i need to get into it???

prg machine · 08-23-2009, 03:16 AM

The Banty rooster agrees

prg machine · 09-19-2009, 10:31 PM

got up the nerve today. Borrowed the 1 5/8 socket and heavy ratchet and breaker bar and a homemade yoke wrench to hold it while i stood on a 6 foot cheater and jumped up and down to free nut. Then the yoke came out very tight on the splines ( a good thing) and I pulled all of the bolts holding the ring on the front. I left it on and stuffed a rag in where the yoke was to kep stuff out of the inside and looked over the seal ride. Not too bad but needs a little work polishing up. \

Is it possible to reposition the seal to run on a different area?? sure would be nice.

Shaky · 09-20-2009, 08:21 AM

Might be able to find a speedi-sleeve that fits.

prg machine · 09-21-2009, 08:25 PM

HELP!!!!

The pinion bearings are pretty darn warm and feels like a brake dragging ..............

I am desperately looking for a diagram of the rear assembly to figure out if i have the bearing preload too tight by changing gasket on the retainer behind the yoke. I cleaned it good and cut a new gasket. The new material is like .015 thick and the old about .032/ Is the end play being affected on the pinion bearings????

I can't find a book here they are all in storage preparing to move.

I am bummed.

prg machine · 09-21-2009, 09:08 PM

I found a HO52 diagram online and it appears that the bearing load is set by a spacer in front of the front timken cone that is pushed by the yoke when it is installed. I am assuming now that the preload is not affected by the retainer cap at all. Maybe what I feel is okay for temp?? I can put my hand on it,,,,,,,,,,,,but it feels pretty warm after 25 miles. Any experts on this???

prg machine · 09-21-2009, 09:23 PM

anyone?

prg machine · 09-21-2009, 09:49 PM

Everything I am finding indicates that the preload on the pinion bearings happens with a spacer between the 2 inner races. Correct me if i am wrong... Maybe the rear end just gets pretty warm????

prg machine · 09-21-2009, 10:12 PM

I went out there under the truck and with e-brake on and truck in gear I can just rotate the driveline slightly clockwise/counterclockwise indicating the slight gear clearance that it has always had. I can turn the yoke effortlessly. nothing binding, just like it was when I checked it before bolting up the driveline to the yoke . I think the heat thing is just normal.

prg machine · 09-21-2009, 11:02 PM

ttt

prg machine · 09-22-2009, 11:42 AM

Bearing housing barely warm this morning.....................brake drum hot! Dragging brake.............Did i tweak something with E-brake on and torquing up the pinion nut??? I used a yoke tool to hold it when tightening nut.

Eichorst69 · 09-22-2009, 12:28 PM

The Eaton is pretty simple. The preload on the pinion is controled by the pinion shims. If all you did was replace the pinion seal and did not remove the shims then just retorque the nut to about 220 ft lbs. You should be able to turn the pinion back and forth freely between the backlash. The shims also have an effect on the ring gear back lash. The retainig plate gasket won't make a difference.
Once I ran into a problem when I used a different yoke due to the original yoke having grooves where the seal makes contact, apparently there was a slight difference which caused the preload to be to tight so I had to change the shims. Hope this helps.

prg machine · 09-22-2009, 03:37 PM

Yea it is running just barely warm now.......maybe had to take a set. The drag feeling is a dragging brake.

05-11-2009, 11:39 AM	#1
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Eaton Rear axle pinion seal. Has anyone changed the pinion seal on one of these? After I remove the Yoke does the seal come out with the front retainer plate? __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

05-11-2009, 03:02 PM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Re: Eaton Rear axle pinion seal. When I thought my pinion seal was leaking I posted this thread that will help you out - ended up not being a pinion problem for me so I didn't have to do anything further. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

05-11-2009, 04:37 PM	#3
hicktownhotrodder Rollin Coal Join Date: May 2009 Location: Winnebago Illinios Posts: 131	Re: Eaton Rear axle pinion seal. i have done this on my rear end. as i remember, it does not come out with it. its a real easy swap. __________________ I have three letters to all these import guys: God-Made-Chevy 04 GMC Sierra 2500HD Duramax 1972 Chevrolet C-30 Dually Pickup stock? 350 SM465 four speed 1977 GMC K-35, TH-400, 4X4 450 horse 454(dad's) 1993 Dodge cummins 5-speed DEAD!!

05-11-2009, 05:52 PM	#4
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Eaton Rear axle pinion seal. After removeing the yoke remove the retainer & you can replace the seal in the retainer. It takes a thick cork gasket behind it but you can use a thick bead of RTV.

05-13-2009, 11:42 AM	#5
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. sounds like 2 different answers. If I got it......I remove the yoke.....remove the retainer and the seal is pressed into the retainer and I have the retainer out to take to do it at the work bench??? __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

05-13-2009, 04:49 PM	#6
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: Eaton Rear axle pinion seal. It's really worth getting your paws on an Overhaul Manual if you can. __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce

05-13-2009, 08:04 PM	#7
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. I have shelves full of manuals and lotsa wrenching experience. I always ask before I dive in anyway. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

05-14-2009, 12:58 AM	#9
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. Thanks a bunch guys. Now to order up the seal and get the pen oil out and let it soak up.................I have had to use a chisel as a driver to get some of these nuts loose before on the Jeeps when things got brutal.......then just replace the nuts since they are not that expensive. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

08-22-2009, 01:34 PM	#10
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. Finaly got tired of the leak so I called and there were 2 seals at the store . 20 bucks. Now to get around to actualy doing it!!!! Who has had to actualy do the speedy sleave repair and how much of a pain is that if i need to get into it??? __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

08-23-2009, 03:16 AM	#11
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. The Banty rooster agrees __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

09-19-2009, 10:31 PM	#12
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. got up the nerve today. Borrowed the 1 5/8 socket and heavy ratchet and breaker bar and a homemade yoke wrench to hold it while i stood on a 6 foot cheater and jumped up and down to free nut. Then the yoke came out very tight on the splines ( a good thing) and I pulled all of the bolts holding the ring on the front. I left it on and stuffed a rag in where the yoke was to kep stuff out of the inside and looked over the seal ride. Not too bad but needs a little work polishing up. \ Is it possible to reposition the seal to run on a different area?? sure would be nice. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

09-20-2009, 08:21 AM	#13
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: Eaton Rear axle pinion seal. Might be able to find a speedi-sleeve that fits. __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce

09-21-2009, 08:25 PM	#14
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. HELP!!!! The pinion bearings are pretty darn warm and feels like a brake dragging .............. I am desperately looking for a diagram of the rear assembly to figure out if i have the bearing preload too tight by changing gasket on the retainer behind the yoke. I cleaned it good and cut a new gasket. The new material is like .015 thick and the old about .032/ Is the end play being affected on the pinion bearings???? I can't find a book here they are all in storage preparing to move. I am bummed. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

09-21-2009, 09:08 PM	#15
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. I found a HO52 diagram online and it appears that the bearing load is set by a spacer in front of the front timken cone that is pushed by the yoke when it is installed. I am assuming now that the preload is not affected by the retainer cap at all. Maybe what I feel is okay for temp?? I can put my hand on it,,,,,,,,,,,,but it feels pretty warm after 25 miles. Any experts on this??? __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

09-21-2009, 09:23 PM	#16
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. anyone? __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:



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09-21-2009, 09:49 PM	#17
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. Everything I am finding indicates that the preload on the pinion bearings happens with a spacer between the 2 inner races. Correct me if i am wrong... Maybe the rear end just gets pretty warm???? __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

09-21-2009, 10:12 PM	#18
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. I went out there under the truck and with e-brake on and truck in gear I can just rotate the driveline slightly clockwise/counterclockwise indicating the slight gear clearance that it has always had. I can turn the yoke effortlessly. nothing binding, just like it was when I checked it before bolting up the driveline to the yoke . I think the heat thing is just normal. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

09-21-2009, 11:02 PM	#19
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. ttt __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

09-22-2009, 11:42 AM	#20
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. Bearing housing barely warm this morning.....................brake drum hot! Dragging brake.............Did i tweak something with E-brake on and torquing up the pinion nut??? I used a yoke tool to hold it when tightening nut. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

09-22-2009, 12:28 PM	#21
Eichorst69 Registered User Join Date: Jan 2007 Location: South Florida Posts: 158	Re: Eaton Rear axle pinion seal. The Eaton is pretty simple. The preload on the pinion is controled by the pinion shims. If all you did was replace the pinion seal and did not remove the shims then just retorque the nut to about 220 ft lbs. You should be able to turn the pinion back and forth freely between the backlash. The shims also have an effect on the ring gear back lash. The retainig plate gasket won't make a difference. Once I ran into a problem when I used a different yoke due to the original yoke having grooves where the seal makes contact, apparently there was a slight difference which caused the preload to be to tight so I had to change the shims. Hope this helps.

09-22-2009, 03:37 PM	#22
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: Eaton Rear axle pinion seal. Yea it is running just barely warm now.......maybe had to take a set. The drag feeling is a dragging brake. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

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