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Old 10-09-2004, 07:51 PM
Hit Man X's Avatar
Join Date: Sep 2004
Posts: 9,087
Thumbs up Ideal axle ratio for 300 swap into 240D?

It was brought to my attention a 300 swap into a 240D I'm looking at is fairly easy. So I'd probably want lower axle ratio to go with it.

I found this:

230,240D RATIO 3.69:1
280E RATIO 3.58:1
300D RATIO 3.46:1
300DT 85 RATIO 2.88:1
300DT TO 84 RATIO 3.07:1

So what's going to be best?

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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Old 10-10-2004, 01:03 AM
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,359
Question More data needed.

Are you swapping engine only?

If you swap 300 engine and transmission, use the 300 differential.
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1980 240D
1983 300D
1984 190D
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Old 10-10-2004, 01:07 AM
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Join Date: Aug 2002
Location: NE Okla
Posts: 1,104
If you are talking a 300 Turbo, the 3.07 is the most plentiful of the two ratios that are most compatible with that engine. However if you were thinking N/A 300, then the best bet would be the 3.46 that should go with that engine. There was some talk about ratios recently, and most finally agreed that 240's and NA 300's don't readily support ratios other than the factory applied ones. The 300-DT's have two available, but there is not a lot of difference between them. The existing 240 ratio would not be a real good candidate for either 300 engine.
1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150
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Old 10-10-2004, 05:55 AM
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Я не хакер
Join Date: May 2004
Location: Varies
Posts: 4,415
This one is too far away to do you any good but is an example of what is out there.

If you go to this auction and click the category, parts cars, then search for mercedes diesel, there are always a few. Won't be long and one will show up within your grasp.

Last edited by TwitchKitty; 10-10-2004 at 06:02 AM.
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Old 10-10-2004, 12:12 PM
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
I was lucky to find a low mileage 2.88 differential and prefer it over the stock 3.07. The 2.88 only went in the 1985 300D, so its hard to find. There's not that much difference between it and the 3.07, but it does lower the cruising speed RPM a bit. That and my 15" wheels.

I think you will need a different driveshaft too, in swapping out the 240D drivetrain for a 300D.

On the other hand, you could keep the 240D differential and engage in some title-for-title drag races with other forum members. Particularly if you keep the 240D trunk emblem and race only 240Ds. Recommend you disable the hood latch so they can't peek.


1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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