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Old 03-18-2010, 03:35 PM   #1
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dana 35 outer pinion seal and bearings

I have a lift kit and SYE CV driveshaft combo coming shortly and while I am into putting all this on my jeep, I would like to replace the outer pinion seal since I have an ever so slight leak from there. My question is, will I have to replace the bearings too? I'm thinking it would be a good idea to go ahead and replace them but does that mean I would have to disassemble the gears and all to get the bearings out?

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Old 03-18-2010, 03:48 PM   #2
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I beleive that the outer seal can be replaced after you unbolt the yolk from pinion without touching pinion and gears, however if you pull gears you will have to re shim everything and takes special tools.

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Old 03-18-2010, 04:06 PM   #3
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That's why I don't wanna touch the gears. But if I replace the bearings along with the seal, will I have to knock them out from the back side? Meaning I would have to tear it all apart?
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Old 03-18-2010, 04:10 PM   #4
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The seal is easily replaced by itself without the need to replace the pinion bearing. Well I can't say it's "easy" but it's not difficult either. I remove the old seal by cutting & peeling parts away with needle nose pliers & vise grips like peeling an orange until it's gone. Getting the new one to seat all the way around is the tricky part, you have to use a very small hammer to tap-tap-tap it all the way around until it is started completely, then tap it in fully so it is fully seated. I bought a seal seating kit from Harbor Freight Tools to do this job which makes it slightly easier but it's not really necessary.

Just take your time to get it started all the way around by light taps, otherwise it can kink which can harm its ability to seal afterwards.

Seal-wise, I like to use SKF but within the SKF parts book listing, I use the Chicago Rawhide seal brand that SKF bought several years ago. The Chicago Rawhide seals are a little more rugged & less likely to be damaged during the seating process.
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Old 03-18-2010, 04:15 PM   #5
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So just replace the seal? That sounds good to me. I was just thinking, since I was gonna be right there to replace the bearings too. But, they're not bad I don't guess, have 125000 miles on em. How long are they usually good for?
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Old 03-18-2010, 04:47 PM   #6
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Replacing the pinion bearing is, more or less, a pretty major job. You have to pull the ring & pinion gears to get to it. Most vehicles wear out and go to the junkyards with their OE pinion bearings still intact.
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Old 03-19-2010, 07:19 AM   #7
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Ah that's what I was thinking about getting to the buggers. And it's good to know I can just replace the leaking seal without messing with anything else. Thanks!
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Old 04-05-2010, 04:50 PM   #8
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Hey Jerry, what about the backlash when taking off the pinion nut? How do you get that set back right? Or is this even an issue?
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Old 04-06-2010, 11:11 AM   #9
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I replaced the one on my 03 a few months ago. I marked the yoke so the I could put it back on the pinion shaft in the same place. I was careful not to knock it around to much and replaced the seal. The pinion shaft never loosened up so I just tightened it back up and it has been running for 8000 miles or so. I put some qasket cinch on the part of the seal that sits against the case just to help it seal better. My 2 cents worth. I did put a little lock tight on the pinion nut and u-joint bolts also just to help things stay put.
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Old 04-06-2010, 11:34 AM   #10
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Quote:
Originally Posted by 99TJSHORT View Post
Hey Jerry, what about the backlash when taking off the pinion nut? How do you get that set back right? Or is this even an issue?
The backlash is not affected, that is set by shimming the carrier left or right until you get the correct amount of "slop" between the ring & pinion gears. Backlash is only affected by replacing the R&P gears or replacing the carrier with a another carrier or full-case locker. What you're thinking about is called pre-load but that is not normally an issue if you simply torque the pinion nut to 160-180 ft-lbs. Tom Wood gave me that procedure years ago and it has worked fine for me on the half-dozen pinion seal jobs I've done.
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Old 09-09-2010, 04:51 PM   #11
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i am changing my seal out and the bearing keeps poping out of place. does that mean its bad? i push it back in there to where it sits and it pops out with the slightest movement but when its in place the pinion shaft is nice and tight. so how do i keep it in place so i can put my new seal in?

When putting my new seal in, it doesnt have the lip on it like my old one did so i guess i just put it in there flush.....?
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Old 09-09-2010, 10:53 PM   #12
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Jerry, where do you find the SKF line of seals. I lucked out at Napa when I got my T-Case output seal and they had a SKF but where would you find the whole line?

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