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#1
11-14-2007, 10:25 AM
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80 300SD differential
I am tossing around the idea of swapping my 3.07 diff with a 2.88 out of a newer diesel or maybe even a 2.47 out of one of the V8's. I am not concerned about acceleration, I am considering fuel economy and noise redux. a higher top end would be a plus as well. my question is has anyone ever done this, and if so what were the results in speed/rpm difference?
right now I am running about 70mph/3.3krpm verdict is still out on MPG due to recent fuel leak location and fix, but it was getting 23-25 mpg before. 
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#2
11-14-2007, 11:22 AM
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best thing I ever did on an '83 300D was to swap a 2.88 into it. Its like MB should have put that ratio in turboodiesels from the start
there are many posts on the subject, here's one thread: http://www.peachparts.com/shopforum/showthread.php?t=200417
__________________
'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!
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#3
11-14-2007, 11:50 AM
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I've got an 85TD, presumably with the 2.88 and I just bought a 79 SD presumably with the 3.07. I thought I'd still prefer the TD to the SD based on the gear ratio. Althought I've only owned the SD a couple of weeks, that hasn't been the case. Since I live in Denver, I drive a lot of mountain grades and my initial impression is that the 3.07 is better for doing that.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#4
11-14-2007, 11:53 AM
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I would like to swap one in also, as I want better mpg's next summer when I am doing a lot of highway driving. I also don't care that much about acceleration, acceleration is expensive.
 Anyone have a 2.88 around that they will sell? I am very interested....
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#5
11-14-2007, 12:04 PM
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Quote:
I have a 2.47 in storage I could be talked out of for the right price.
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#6
11-14-2007, 01:53 PM
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You dont want a 2.47 unless you live in florida and never plan on leaving the state. 2.88 is what I have and its a big of enough difference over the 3.07.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#7
11-14-2007, 03:37 PM
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Yeah I am going to wait for a 2.88.....I still want *some* acceleration.
 
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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