42re Overdrive Unit Snap Ring Replacement - JeepForum.com
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  • 1 Post By 02Lightning
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  • 3 Post By HarryH3
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post #1 of 11 Old 09-22-2021, 12:45 AM Thread Starter
Ojivar
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42re Overdrive Unit Snap Ring Replacement

Hi all


I've been getting quotes to fit new snap rings in my overdrive unit and garages are asking silly money (more than I paid for the Jeep!) so I am wondering if it is something I can do myself with the right tools?


I've read the write up on here and watched the video on how to do it and it seems a reasonably easy job if you have a shop press, so if I was to purchase these two things would I be able to do the job at home?


Thanks all.

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post #2 of 11 Old 09-23-2021, 10:26 AM
02Lightning
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Have you thought about just replacing the whole rear unit that has the snap ring in it? I've seen them on ebay.

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 175,000 miles
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post #3 of 11 Old 09-24-2021, 02:12 AM Thread Starter
Ojivar
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Quote:
Originally Posted by 02Lightning View Post
Have you thought about just replacing the whole rear unit that has the snap ring in it? I've seen them on ebay.

I certainly have been looking but it works out at silly money here in the UK. Cheapest is around $700 once you factor in delivery and import fees.
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post #4 of 11 Old 09-24-2021, 06:54 AM
02Lightning
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Originally Posted by Ojivar View Post
I certainly have been looking but it works out at silly money here in the UK. Cheapest is around $700 once you factor in delivery and import fees.
That's a little expensive.
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post #5 of 11 Old 09-25-2021, 12:49 PM
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I have not done this repair myself, as all my closest WJ's are v8's, but the video seems to show it being a fairly straightforward process. Just be careful when you have it locked down, so as not to cause the bear trap to go bang on you...I would buy the press and snap rings and give it a go. Then you have a press to use for the axle bearings in the rear when they go bad as well.
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post #6 of 11 Old 09-25-2021, 01:59 PM
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My only advice is to buy a bigger press, not for this job, but for future jobs. I have a 12-ton press and really wish that I would have bought a 20-ton model. Not because of the extra force, but because of the extra width between the uprights on the 20-ton. Sometimes you need to press a part in or out of a much larger part, but it doesn't quite fit where you want it to go. For items you need to press out that are at the edge of the larger part, the working space is reduced by half, as you can only really use the space from the center to one side or the other. I sometimes have to get creative on how to support a part that's hanging off of the main crossbar of the press.
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post #7 of 11 Old 09-25-2021, 05:24 PM
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Quote:
Originally Posted by HarryH3 View Post
My only advice is to buy a bigger press, not for this job, but for future jobs. I have a 12-ton press and really wish that I would have bought a 20-ton model. Not because of the extra force, but because of the extra width between the uprights on the 20-ton. Sometimes you need to press a part in or out of a much larger part, but it doesn't quite fit where you want it to go. For items you need to press out that are at the edge of the larger part, the working space is reduced by half, as you can only really use the space from the center to one side or the other. I sometimes have to get creative on how to support a part that's hanging off of the main crossbar of the press.



Good point Harry. I have wished for the 24 ton press everytime i do a rear axle bearing on one of these Jeeps as well. Maybe the way to go is to spend the same money on this repair that the shop charges, and buy the bigger press. but then you save money later on on these type of projects.
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post #8 of 11 Old 09-25-2021, 08:52 PM
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If you have no issues with pulling the overdrive unit yourself, many shops will swap out the snapring for just a few clams…say 50 to 100. If it’s the outer ones, it takes all of 10 minutes. If you are changing the direct snap rings, about triple that.
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post #9 of 11 Old 09-26-2021, 02:03 AM Thread Starter
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Thanks all, I think I am going to order the rings first as they will take a while to get here from Canada/US, then see if any shop will fit them for me if I remove the unit myself and bring it in. If no one will do it I'll get the press.
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post #10 of 11 Old 09-27-2021, 08:52 PM
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If you have a 2WD, the overdrive unit is relatively simple to separate and pull out the transmission, otherwise you have to drop the T-case first. It can be done in your garage, you just have to make sure to support the transmission so the output shaft doesn't "bind" inside the OD. The rings that hold the OD in its housing are easy to swap. The ones that hold the OD shaft together are under extreme pressure and could literally kill you if you attempted to remove without a press. What I've done, I went and got a spare from the junk yard and rebuilt it. That way I just had to swap the rebuild one with the old one. Went to a transmission shop, that took 5 min and they refused to charge me. Reinstall can be frustrating. Again you need to make sure the transmission is supported. You need a replacement gasket for where it mates with the transmission.

You might find this video helpful.

www.youtube.com/watch?v=JRv2fU10GLk
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post #11 of 11 Old 09-29-2021, 01:41 AM Thread Starter
Ojivar
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Quote:
Originally Posted by rep-tile View Post
If you have a 2WD, the overdrive unit is relatively simple to separate and pull out the transmission, otherwise you have to drop the T-case first. It can be done in your garage, you just have to make sure to support the transmission so the output shaft doesn't "bind" inside the OD. The rings that hold the OD in its housing are easy to swap. The ones that hold the OD shaft together are under extreme pressure and could literally kill you if you attempted to remove without a press. What I've done, I went and got a spare from the junk yard and rebuilt it. That way I just had to swap the rebuild one with the old one. Went to a transmission shop, that took 5 min and they refused to charge me. Reinstall can be frustrating. Again you need to make sure the transmission is supported. You need a replacement gasket for where it mates with the transmission.

You might find this video helpful.

www.youtube.com/watch?v=JRv2fU10GLk

Thank you that's incredibly helpful. I will be talking to my local mechanic soon in the hopes he will let me use his shop for the work.
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