Did Diesel Geeks Swap To 2.46
 

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

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

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

rb

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 :D :D

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

robert bullard

Ahhh yet another conversion. Sweet isn't it?

Meanwhile, I'm still plotting to change my '85 300TD
 

from the factory 2.88 to a 3.46 from a non-turbo, because my daily route is now all 45 mph and soon to be lowered to 35 for the Jamestown quadracentennial years, and I could use some oomph to leave all those new stoplights briskly. I suspect that the fuel mileage will be about the same, because it may get into 4th gear a lot more often.

When I've got some fast cruising to do, I take the '86 BMW 324td anyway.

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.

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.

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

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. <g>

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

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

There's LOTS of 420SELs near me, do these have the 2.47:1 Limited Slip diffs also like the 560s?