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Thread: Rear diff leaking - pinion seal

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    Senior Member Getting Dirty
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    Rear diff leaking - pinion seal

    I noticed some fluid under my Commander a few days ago. It appears that the rear pinion seal is leaking. There is NO play in the driveshaft so the bearing is not shot, yet.

    I've never messed around with this kind of problem. Can anyone tell my how involved this seal replacement is? The axle is a Chrysler 213MM.

  2. #2
    Super Moderator Getting Dirty 07JeepXK's Avatar
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    Its very easy to do. I replaced my rear pinion seal in June and havent had any issues since. Check out post #30 in this thread. adamag25 posted the instructions right out of the service manual in his garage thread for me on how to properly replace the seal.

    http://www.jeepcommander.com/forums/...?t=6015&page=3
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

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    Senior Member Getting Dirty
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    Perfect! Thanks 07. As long as the leak isn't terrible is it safe to drive until I get time to fix it, say about a week?
    Last edited by jcoulter; 10-25-2010 at 05:21 PM.

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    Super Moderator Getting Dirty 07JeepXK's Avatar
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    Yeah its fine as long as there isnt a huge puddle on the ground after you park it overnight. If its just a little wet around the seal your good to go till you can fix it.
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

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    Got this done last night. I did have a buddy help that has done this before. That was nice. Had to get out the 3/4" drive set for the nut.

    Thanks for the help 07!

  6. #6
    Super Moderator Getting Dirty 07JeepXK's Avatar
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    Not a problem! Glad everything worked out for you.
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

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    I was just about to post to ask if anyone other than me had to replace a rear pinion seal.
    I have 18,000 miles on my 07' with the Chrysler 12 bolt rear. I just replaced the seal this past Tuesday. Everything looked real good as far as pinion angle and condition of things, The seal was just leaking. The fluid level was barely below the fill hole. I thought it would have been a lot lower with the amount of diff. fluid in my garage and on the rear diff.
    Is this a common problem?
    - Keith -

    07' RedRock Crystal Sport XK, 4.7 Flex, QDII, leather, power liftgate, remote start, moonroof, skylights, power pedals and seats, Boston Accoustics, 20% tint, Mopar skid plates, splash guards and slush guards, 2" RC lift, SpiderTrax, Kelly TSR 265/70/17 .

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    Lifetime Member Getting Dirty Matt's Avatar
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    Yeah it's not hard to do... but you'll need a beam style in-lb torque wrench, the click-style won't work. Definitely want to make sure that you get the correct rotational resistance or else you can ruin the bearings/gears (too tight will damage the bearings, too loose will damage the gears due to pinion slop). So the price for the torque wrench is well worth it...

    Money well spent: http://www.amazon.com/2955-Torque-Wr...1438124&sr=1-3

  9. #9
    Lifetime Member Getting Dirty Matt's Avatar
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    Actually... 0-60 in-lb may not be enough. That's what I would use if i was installing new gears. But for just replacing the pinion seal you'll also be turning the ring gear/carrier/axles... so you may need this one instead: http://www.amazon.com/KD-Tools-2956-...1438304&sr=1-4

  10. #10
    Super Moderator Getting Dirty 07JeepXK's Avatar
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    I never ended up using a torque wrench and I really didnt go by the instructions for the whole rotational resistance. Haven't had any problems since the install and that was over a year ago.
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

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