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  #1  
Old 03-08-2010, 07:35 PM
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Join Date: May 2000
Location: Greenville, NC
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WTB: 2.88 rear end gear, speedometer - 1985 300SD

Looking for a "drop in" 2.88 rear end diff gear and matching speedometer (instrument cluster) from a 1985 300 SD to go in my 1984 300 SD that has a 3.07 gear.

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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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  #2  
Old 03-08-2010, 11:33 PM
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How soon do you need the speedo? I have a spare.
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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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  #3  
Old 03-09-2010, 09:12 AM
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Location: Greenville, NC
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Not in a big rush Hit Man X, At your leisure.

Still "studying" the project. The 1985 speedo plug connection should be the same as my 1984?
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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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  #4  
Old 03-09-2010, 08:46 PM
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PM me in about a month when I am home.

As I understand they swap.
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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
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  #5  
Old 03-25-2010, 03:26 PM
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Location: Wichita, Ks
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I know of a low mileage t-boned '85 300D in a yard.

Euroasian auto wichita, ks

(316) 838-9288
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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
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  #6  
Old 03-26-2010, 11:28 AM
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For my 1984 300SD, I have a lead on a 1985 300TD W123 2.88 rear (no abs plug/sensor in diff case like on the 1985 W126s). I am going to use a 1985 W126 300SD speedometer.

I hope this all will work!
__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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  #7  
Old 03-26-2010, 04:55 PM
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Location: Greenville, NC
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Partsman225, I could be wrong but did not the 1985 300SD W126 have a 2.88 gear?

I was hoping to just pull axles and stick 2.88 gear into diff housing w/o having to swap the diff cases, driveshaft mounts ect....

Will this work?
__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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  #8  
Old 03-26-2010, 07:04 PM
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For 1985, all W123 and W126 diesels had 2.88 differentials. The w123 has a cable speedo. All w126 cars have an electric speedo.
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  #9  
Old 03-28-2010, 11:32 AM
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Location: Greenville, NC
Posts: 533
I crawled under my car. On outside diff case next to plug is part number 115 351 32 08. Also there is a breather tube at top drivers side of diff case.

Looked in FSM 35-500 page 423 (lateral center piece, sealing rings, bearing caps, bolt patterns-3 versions.). Pages 424-426 (diff chart) with ratios and number of teeth. For 107, 123, 126 chassis. NO 2.88s, closest is a 2.82 ratio, 48.17 teeth, 1981 in a 126 032 chassis (500SEL), 2.72 in a 107 026/046 chassis 49.18 teeth. There is alot of 2.47s.

On page 448, (models with ABS); 2.82 in a 126 353 03 85, 34 teeth, 2.72 in a 126 353 06 85. Alot of 2.47s. All 123s show 4.08, 3.92 (15 inch wheels), 3.69, 3.58/3.54 and 3.46 ratios.

I can go online to EPC online and look up some some of these part numbers

Alot of conflicting info on this subject.
__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification
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  #10  
Old 03-28-2010, 06:02 PM
aaa aaa is offline
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Maybe it was a list of gasser models? 2.88 is on all the diesel 85's.

Here's a pic, look closely and you'll see "3.07" ratio stamped next to the "15mm cover bolts", since that's an '84:
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  #11  
Old 03-28-2010, 11:13 PM
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Location: Greenville, NC
Posts: 533
aaa, nice pic!

Thanks for the tip about the 3.07 stamping. Crawled under to look for some ratio stamping around my gasket bolts, did not see anything but may need to clean and get a stronger light. will check agian.

aaa, are you sayingl all 1985 ...300D, 300TD, 300TD wagon (123), and 1985 300SD (126) diesels had 2.88?

__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification
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