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Old 04-18-2002, 05:49 PM
Tom Cao
Posts: n/a
How to replace 89 300E rear differential- Help!

Please help me, I'm attempting to replace the rear differential for my 89 300E, but I don't know how hard it is, what to look for and how to do it. I've done some minor repairs for my car before such as: replacing shocks, break pads,..., but never done any thing with the engine or transmission. I consider myself a fast learner. Please advise me as what to do, any infor is greatly appreciated. Thankyou very much for all your help.
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Old 04-18-2002, 09:25 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
You will need a few special tools...Like 8 and 12mm allen sockets.
Donnie Drummonds
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Old 04-19-2002, 11:44 AM
Tom Cao
Posts: n/a
Thanks for the response, is there some things, tricks I should watch for?
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Old 04-19-2002, 12:27 PM
Glen's Avatar enthusiast
Join Date: Sep 2000
Location: Carlsbad, CA USA
Posts: 1,187
I am not a tech, just an avid DIY'er but I have replaced differentials in both a 124 and 201 body.

The bolts that hold the axle to the output flanges have 12 pt stars so you'll need the correct size for those. There are 8 bolts per axle and you'll need to be able to turn the axle as you go around to remove the bolts. This means that you need some good jack stands to hold the car up while you're doing this...or if you have access to a lift, that would be best.

There are only three bolts that hold the differential to the subframe. Two at the back which use the 12mm allen heads that Benzmac referred to and one in front.

You'll also need to remove the ABS sensor. Oh, I think it's much easier to do all of this if you remove the exhaust from the cat back.

Good luck
Glen Tokuhara
Beauty & the Beast and the wagon that could!
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Old 04-22-2002, 02:13 PM
Tom Cao
Posts: n/a
Thanks Glen for the advice. It was very helpful, I need to prepare everything before doing it. Now I need more help from any one out there.
I just bought a used rear differential for my 89 800E and I don't know how good the seals are so I'd like to replace these seals before putting this real differential into the car, but I don't know how to go about taking the old seals out. Do I need any special tools for this or perhaps I don't even need to replace these seals at all. Please give me some advices on this. Thanks in advance for your idea and time.
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Old 04-22-2002, 03:55 PM
Swedish Diesler
Join Date: Jan 2002
Location: Sweden
Posts: 106
I looked up the relevant chapters on the servicecd and zipped the pdfs for you to take a look at.

They give a good idea of the work involved but don't be frightened by all the special tools they use, 9 times out of 10 they are easily replaced by some elbow grease and your favourite cussword

MB E300TDT -98

Last edited by per eriksson; 04-22-2002 at 04:04 PM.
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Old 04-24-2002, 12:11 PM
Tom Cao
Posts: n/a
Rear differential for 89 300E

Thanks per, I received your pdf files and it looks very informative. I'll probably have to go buy a few more tools and maybe try to do it this weekend if weather permits and I'll let you all know how it goes. Also, where can I buy the 13mm hex bit for the drain nut on the rear differential. I'm afraid I don't have the right tools???
Again, thank you all the supporters
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Old 04-24-2002, 12:35 PM
J.HIDALGO's Avatar
Registered User
Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Autozone may have it!

'86 300E
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Old 04-24-2002, 07:04 PM
Senior Member
Join Date: Apr 2001
Location: Baton Rouge
Posts: 485
Tom I faxed you detailed instructions on removal and install ,good luck
euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck
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Old 04-25-2002, 02:40 PM
Tom Cao
Posts: n/a
euro 287,
I got your fax, Thanks for all your help. , that means I've gotten enough instruction on how to do it. I might not able to do it this weekend though, because it's still too cold here in Minneapolis. I keep you guys posted. Thanks
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Old 04-29-2002, 10:29 AM
Tom Cao
Posts: n/a
How to replace pinion seal for rear differential for 89 300E

I replaced 2 radial seals on the rear differential, but now I need to know how to replace the pinion seal before putting this rear differential into the car. Does any one has any infor on this? It looks like I'll need some special tool for this ? I thank you in advance for all your help. Thanks
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Old 04-29-2002, 06:36 PM
Registered User
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Unless it is leaking, leave it alone. You will have to remove the pinion flange and retainer nut, which will kill the bearing preload on the pinion shaft. Torque and position of these components is critical to proper rear end setup and clearances. Don't fix it if it "ain't" broke.
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.
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Old 05-02-2002, 01:36 PM
Tom Cao
Posts: n/a
I completed sucessfully

Thankyou all for everything, the emails, faxes with very helpful infor. I replaced all 3 seals before putting in the rear differential. Everything went well. The gear oil plug required a 14mm hex bit and I couldn't find it at Sears, so I end up buying a 14mm bold from the hardware store and bend it to use as a tool. Anyway, the rear differential works good now. Thanks again everyone!
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