I keep thinking about this and then talking myself out of it. I have an 83 300sd and I live in a pretty hilly area. I want someone who has done this to say to me "Don't do it you will hate it"....OR...."Do it, I now get 30mpg all the time"

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg

Don't do it...........you will hate it.

I put the 2.88 in the SD and that's the limit..........any serious hills and the vehicle can just barely hold 65 mph..........and it's running perfectly.

BTW, the folks that put the 2.47 in the W126 could not document any fuel economy benefit as compared to the 2.88. On the highway, the engine still has to do the work, and the axle change didn't seem to matter. One of them has a side by side comparison in the archives.

We did not see much fuel usage reduction, maybe 1-1.5mpg better at the most. Its hard to say. The best part is how quiet it is. In the city you can cruise along at 25-35mph in 4th gear doing about 1000rpm!

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-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)

Yeah, I've got hills. On the highway I'm getting about 27-30 anyway. Total average fuel econ is about 27. I do alot of highway.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg

will everything hook up froom a 300d speedo to the 240?(except for the tachometer of course)
i wonder if a tach could be made to work from parts off a 123....
i recall seeing some video of a 240D with a tach on it...probaly uses very similar parts such as cable and magnetic pickup near the crakshaft pulley.[/QUOTE]

A 300D spedo will fit into a 240D, same body. just make sure the Diff and spedo are from the same car to match.

Funola, added a tach to his 83 240, but it has the EGR computer thing in this thread
DIY tach for 240D w EGR- easy!

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

I have not found a mechanical speedo for a 2.47 gear. for some reason I recall maybe there is such a speedo for a w107 but not sure. The W126 have electronic speedos. I was going to fiddle with a spare speedo to see if I could regear it but it is not on the top of the list. there are also speedo reducers out there but I havent found one that definitely will work with the MB cable. I may also try a 450sel 2.62 speedo/gear combination if I can find one that hasnt already had the speedo removed. seems to be the first part removed from MBs in the yard. If I change to a 5 spd I will reinstall a 3.06 in my coupe.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)

Is this with a downshift to 3rd? Just curious. I have a 2.24 lsd in my SD and it does just fine. I commute to Park City daily and the canyon is a 6% grade to the top of Parleys Summit. I can maintain 70-75 in 3rd, which puts the tach at about 3500.

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1982 300SD 180K, rebuilt engine
1973 450SLC Megasquirt
1990 Volvo 780 - 273k
1993 Volvo 240 Wagon - Scrap yard slumber

http://www.fuelly.com/sig-us/44619.png

Not considering the 4-3 downshift.

If you don't mind forcing the downshift for each hill...........have at it.

But, unless you find the 2.47 for free...........why bother?

True enough. I just happened upon the 2.24 lsd in a euro 500se at the wrecker awhile back. My old diff had some serious problems internally so it's just the route I went. There's some pics somewhere on here of the failure. Really it's just a matter of preference I guess. The current diff seems just fine for me

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1982 300SD 180K, rebuilt engine
1973 450SLC Megasquirt
1990 Volvo 780 - 273k
1993 Volvo 240 Wagon - Scrap yard slumber

http://www.fuelly.com/sig-us/44619.png

so, what you have to do is downshift to maintain 75. The benefit is that the engine is quieter (when in 4th on easy terrain) and a slight increase in fuel economy?

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg

I rarely have to kick it into third other than on long fairly steep grades. Engine RPM at 80 is appx 2450 or so. I could not tell you about fuel mileage for a few reasons, first this engine only has about 20k on it now so it is still breaking in, second I never really drove the car with the old diff in it because of the internal damage it had. Finally drove the SD, now yet another issue. The best mileage I've seen so far was on a trip to Seattle and averaged appx 30. That was being fairly easy on the pedal. We have winter diesel now so mileage has suffered, coupled with dragging calipers at the moment.

I paid around 120 for the diff and axles at the wrecker. It's cheap enough, and if you have spare time and don't mind the puzzle of trying to make it all go in it's easy enough to change back if you don't like it. Some other person on here may need that new diff you grabbed.

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1982 300SD 180K, rebuilt engine
1973 450SLC Megasquirt
1990 Volvo 780 - 273k
1993 Volvo 240 Wagon - Scrap yard slumber

http://www.fuelly.com/sig-us/44619.png

2.47 diff in 300SD

Read the entire thread before you do it.

Very Good Information!!!!!

Still searching for the 2.47:1 diff, but wanting to get my cruise rpm @ 70 down to 2400 from my current 3000 with the 3.07:1 axle and 205/70/14 tires....Robert

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

I have the 2.47:1 diff..........which I temporarily considered...........but will probably never install it. I'd trade it for another 2.88 if you find one.

You'd like this diff..........it's LSD.

I would love LSD. I wouldn't have to use the 'parking brake positraction' method in the snow anymore. My 617.950 pulls so hard even in high gear that i think it would happily accept the 2.47:1 axle without complaint.

I see 2.88's all the time. I am sure I can get you one....for a 126, right????

Attached Thumbnails

 

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership