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#1
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Rear differential gone bad??? Please read!!!
Hi everyone, my 1987 300td sedan just developed a bad "CLUNCK" in the rear end when shifting between 2-3 and 3-4. It only happens while under very light acceleration or going downhill, basically when there is no heavy pressure being applied to the differential. If I accelerate harder, it shifts through all 4 gears fine. Is my rear differental done (too much play in it) and needs replacing?? Any help is greatly appreciated.
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1984 MB 300D Turbo Diesel W123 Sedan 132K 1987 MB 300D Turbo W124 Sedan 295K 1983 Porsche 944 104K 1989 Audi 80 Quattro 180K 2002 Audi A6 3.0 Quattro Avant 49K (Wife's car with warranty ) http://banners.wunderground.com/bann...inneapolis.gif |
#2
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Check your flexdisks.
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#3
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Your symptoms typically signify a vacuum leak to the modulator.
Got a vacuum gauge that you can put in a T with the transmission vacuum line and drive the vehicle.......see what the vacuum level is? |
#4
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W124 300E differential in a W124 300TD???
I checked the vacuum and the rear flex disc... everything is fine. I still think it`s the rear differential going totally bad. My next question is will a differential from a 1987 300E fit my 1987 300TD?? I have an extra diff from the 300E (my parts car) and would certainly love to use it. Thanks everyone!!
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1984 MB 300D Turbo Diesel W123 Sedan 132K 1987 MB 300D Turbo W124 Sedan 295K 1983 Porsche 944 104K 1989 Audi 80 Quattro 180K 2002 Audi A6 3.0 Quattro Avant 49K (Wife's car with warranty ) http://banners.wunderground.com/bann...inneapolis.gif |
#5
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be advised that mb rear ends almost NEVER wear out.
you have to run them without lube or have two very different sized rear tires to hurt them. this is why the other fellows are suggesting other things. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#6
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I was just discussing a rear end clunking noise with Greasybenz, we took a drive in my '87 project car. We both drive '87 300D's and we both have a decided clunk when the trans shifts.
One cause for this is worn bushings in the rear control arms, its very common in that chassis. You simply replace the arms. The rear suspension in the W124 need these parts otherwise the cars won't handle right and will make all kinds of nasty noises. There is a lot of torque in that engine that also causes rubber in the diff mount to flex, its worth inspecting also. I would put my bets on parts other than the differential, not to rule it out completely but suspension parts are much cheaper to fix than a new diff.
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
#7
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Quote:
There is info on this in several of the forum threads, try the search feature. The ratio is stamped into one corner of the diff case too BTW. Someone I believe wanted the 3.27 to gain acceleration in a diesel. Why I wouldn't know because they accelerate fine (unless you were planning on drag racing or something!) actually I'd love to find a 2.32 or similar for mine!
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
#8
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You can thank Dave
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1999 E300DT (131,800) 154,000 Black on Black SOLD 2006 CLK 500 coupe Capri Blue on Grey (zoom,zoom) 47,000mi 04 VW TDI Passat 80,000mi (Techno) How to eliminate oil dependency through market-driven approaches. “We could cut oil use in half by 2025, and by 2040, oil use could be zero,” The Sound of Diesel Speed Ode to MB |
#9
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How to get the differential rubber bushings out?????
I purchased a rear differential RUBBER BUSHINGS today. I can't get them out though. Do I need a special tool to remove them? PLEASE PLEASE HELP!!!
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1984 MB 300D Turbo Diesel W123 Sedan 132K 1987 MB 300D Turbo W124 Sedan 295K 1983 Porsche 944 104K 1989 Audi 80 Quattro 180K 2002 Audi A6 3.0 Quattro Avant 49K (Wife's car with warranty ) http://banners.wunderground.com/bann...inneapolis.gif |
#10
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The clunk is pretty likely to be the rear diff mounts in the subframe... this is a pretty common failure. I've never changed them though, and I don't know how hard it is. I know there is a special tool to pull/press the new ones in. Usually when the diff goes bad, it howls, not clunks. Don't use the 300E diff, the ratio is not the same (see PDF link above), and besides I don't think changing the diff will do anything.
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#11
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I second the diff mounts.... this was a spendy repair.
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-------------------------------------------- 1960 MB 190Db w/ full sunroof 1985 Toyota Pickup 2006 Honda Odyssey EXL R&N 2001 VW Jetta GLS TDI |
#12
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She's cured!!!
Everyone was right!!! It was the differential bushings and not the differential itself!!! I can't believe that they can couse so much pain in the b... Along with an unpluged vacuum line which caused the transmission to shift rough it is now all good and she runs great. A few minor things here and there and she'll be a top model again!!!
BIG THANK YOU TO EVERYONE AT THE FORUM!!!!
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1984 MB 300D Turbo Diesel W123 Sedan 132K 1987 MB 300D Turbo W124 Sedan 295K 1983 Porsche 944 104K 1989 Audi 80 Quattro 180K 2002 Audi A6 3.0 Quattro Avant 49K (Wife's car with warranty ) http://banners.wunderground.com/bann...inneapolis.gif |
#13
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Good job. The differentials on these things are pretty robust.
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#14
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Quote:
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1TL0XFTNI1W30MGMVR&year=1984&make=MB&model=300-DT-001&category=J&part=Differential+Mount |
#15
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No, those are differential mounts and not the bushings. Bushings are facing backwards toward the rear of the car and you can clearly see them if you look at the differential from the back of the car. $25 for a pair at the MB dealer.
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1984 MB 300D Turbo Diesel W123 Sedan 132K 1987 MB 300D Turbo W124 Sedan 295K 1983 Porsche 944 104K 1989 Audi 80 Quattro 180K 2002 Audi A6 3.0 Quattro Avant 49K (Wife's car with warranty ) http://banners.wunderground.com/bann...inneapolis.gif |
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