WOW....What a diff ...in swapping the dif...the 3.07 is history..this is the car MBZ should have made ...soooo calm and quiet ....600 bucks parts and labor...cant get the smile off my face GEEK U DA MAN....

thanks robert bullard

__________________
82' 300 sd 100k
98' sierra 3500 6.5 TD 200 k(for sale)
2001' VW tdi 60 k mrs. car ...nice
2000' pro stock RWD honda (tagracecraft.ca)
44' foot feather lite hauler
and Al the idiot...cant pack a chute worth poo

Sounds cool... so will it downshift now at highway speeds?

__________________
1985 CA 300D Turbo , 213K mi

down shifts great...and believe it or not ....damn fine acceleration

rb

__________________
82' 300 sd 100k
98' sierra 3500 6.5 TD 200 k(for sale)
2001' VW tdi 60 k mrs. car ...nice
2000' pro stock RWD honda (tagracecraft.ca)
44' foot feather lite hauler
and Al the idiot...cant pack a chute worth poo

I can't wait for my CV boots to fail, so I have an excuse to re-do the rear end with a 2.47

__________________
-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)

bro dont wait/// its so worth it ....this is such a different car now...bloody awesome

robert bullard

__________________
82' 300 sd 100k
98' sierra 3500 6.5 TD 200 k(for sale)
2001' VW tdi 60 k mrs. car ...nice
2000' pro stock RWD honda (tagracecraft.ca)
44' foot feather lite hauler
and Al the idiot...cant pack a chute worth poo

Ahhh yet another conversion. Sweet isn't it?

__________________
1983 Mercedes 300SD
1987 Mercedes 300SDL
2001 VW Passat 2.8 AWD
2007 OM642 Jeep WK 4x4

OK..so you put a 2.46 differential into the W123.........what do you do to get a speedo to read correctly........for those of us that care about such things.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

What differential did the 90-93 300D 2.5 Turbos come with? I haven't looked into it but was always wondering...

At 120km/h I read about 2700 rpm (of course it depends on the 4th gear ratio too).. but I can downshift no problem on the highway, and it will shift back up into 4th around 135 km/h.

__________________
1991 MB 300D 2.5 Turbo (207000km) (now gone)
1993 Audi 100 CS Quattro (300000km)
1999 VW Jetta TDI (290000km)
2002 Audi A6 3.0 Quattro (150000km)
2005 MB E320 CDI (34000km)

BHD,

About a month ago, I put a 2.46 into my 300SD. Yesterday, I put a speedometer from a 380SE into my 300SD. Problem solved. No more computations while I am driving the sweetest riding diesel in the world. That 2.46 is the way to go and I agree about acceleration not being adversely affected. I cannot tell a difference from the 3.07. I know there must be, but it seems negligible. I am now going to start recording fuel mileage numbers. I was getting a steady 28 mpg with the 3.07, it will be interesting to see what I get with the new setup.

Tom

__________________
1993 300TE
1984 300D
1984 300SD
1976 BMW R90S

Interesting! I have a nice 380SE with a bad case of "the cams" and a good 617 drivetrain in a worn 300SD.
May just stick the 617 in the SE chassis. Save me the trouble of that difficult speedo swap.

My bad somehow I had W123 on the brain.............

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

I think he swapped it into an SD. I am hoping he will get out from behind the wheel long enough to give us details. I searched for DieselGeek and he did an SD, I think.

I am also interested in the W123 swap. I think I have access to the parts. Sounds like you have to swap the flange where the flex plate bolts up and the shims where the axles fit. Then it would just be a wrestling match. Not sure about driveshaft length.

Right its a 300 sd, Speedo on order from same donor car. wife paced me this morning on the way in.. I work in kilometers so I' ll convert it ....previously 68.2 mph (110) kph = 3000 rpm now... 2400
74.5 mph (120) kph = 3125 rpm now ...2650

Cant Believe IT Friggen awesome those rpm used to cut right into the cabin now its quiet and relaxed. Still smiling ..

robert bullard

__________________
82' 300 sd 100k
98' sierra 3500 6.5 TD 200 k(for sale)
2001' VW tdi 60 k mrs. car ...nice
2000' pro stock RWD honda (tagracecraft.ca)
44' foot feather lite hauler
and Al the idiot...cant pack a chute worth poo

Holy resurected thread batman,

The yolk can be swapped off the tranny or the diff, yes its bolt on, you need a 30mm 12 point long shaft socket, (not the most common item).

The stock axels should work just fine.

I also had a longbody W126 with a 617 turbo, and a 2.47 rear and it was great, averaged 28 MPG over 60K miles, got as high as 31 mpg on some tanks.

AFAIK there is no W123 speedo that will work correctly with the 2.47 diff.

__________________
1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

I'd like to see before and after 0-60 runs to see whats lost.

If its under a second its probably worth the trade off, more than that ehhh not so sure.

__________________
2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200