94 C280 tranny won't go in reverse - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 04-24-2007, 04:25 AM Thread Starter
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94 C280 tranny won't go in reverse

Hi guys!

My college daughter's 94 C280, out of the blue and without any warning signs, won't engage the reverse gear.

The gear shifter feels fine. The two plastic bushings look fine when viewed from below with a light and mirror. It engages all forward gears fine. No unusual noises. When shifting into reverse, the rpm only drops about 50-100 rpm, and you can hear a very faint whining sound.

The fluid level was fine, ruby red, Mobil 1 synth ATF, about 50k miles since last changed. No burned smell either. I dropped the AT pan, no metal or debris anywhere.

What else can I check before I get it rebuilt, or get a reman tranny to replace it?

BTW, Magnolia, as I call her, has been a grreat car since I got her in 2000 with about 80k miles. It now has about 220k miles and has been virtually trouble free. I haven't posted here in a long time due to its reliability.

Any help will be greatly appreciated.
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post #2 of 6 (permalink) Old 04-24-2007, 05:09 AM
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Hi Serge,
Nice to see you still have the W202. This is taken from another post:"If it doesn't go into reverse it sounds like reverse piston seals or reverse clutches. The former is a fairly simple job, the latter is likely a transmission rebuild."
Due to the high mileage on your W202, I wouldn't be surprised if a rebuild is necessary. My W124 has 189K miles and I'm sure a tranny rebuild is not too far away.
Best of luck!

Sergio
'95 E320 189K miles
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post #3 of 6 (permalink) Old 04-24-2007, 12:59 PM
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Sounds like b3 piston failure, which I think requires the transmission to be dropped in order to repair it. From what I have read you might as well just have it rebuilt while it is out.
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post #4 of 6 (permalink) Old 04-25-2007, 04:23 AM Thread Starter
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Nice to hear from you again, Sergio!

I've been more active lately in the mbca.org W123 forum, due to my purchase of "Kaiser" as a daily driver. Go see its photos and story there. Their W202 forum is sorta weak though.

And thanks for your input, too, lovemyc280!

So far, I got replies pointing to a bad B3 piston, behind the tranny pump in the back of the tranny. But, can this be repaired or replaced during a rebuild, or do I need to replace the whole tranny?

I am looking at a reman. tranny from Precision with a 3-yr warranty for (yipes!) $1575 plus $275 s/h. Is this a reasonable price? My indy tech (and friend) would charge me just $350 for labor, which I know is a steal, for replacement with a reman.

The rebuild option would cost about $1850, parts and labor included.

I really prefer not to go with a used tranny, since I'd be getting who knows what that way...

What do you all think?

(Meanwhile my daughter is driving Ole Blu, which looks funny on her... hehe!)

Thanks very much indeed!
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post #5 of 6 (permalink) Old 04-25-2007, 09:57 AM
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From what I have read in order to replace the b3 piston it needs to be dropped and essentially you are going to do 70 percent of the rebuild anyway (somebody correct me if this is wrong.) So in my opinion you might as well just rebuilt the thing.

I think your rebuild price is reasonable. The cheapest rebuild price in Tampa I can find so far is 1800-2200 out the door. How long is the rebuild warranty?

Here is another transmission site I found online (I don't know anything about them though.)

mercedes transmissions
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post #6 of 6 (permalink) Old 04-26-2007, 06:59 AM
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Serge,
Don't waste time/money repairing it. Replace the tranny with a remanufactured unit. The prices you were quoted are reasonable. Also, don't buy a used tranny as you may end up where you are now in a very short time.
Good luck and keep us posted.

Sergio
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