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Old 09-13-2002, 05:58 PM
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Join Date: Jul 2002
Location: Ojai, Ca.
Posts: 76
Gear Ratios

I have a 1990 300 SEL. I have been unable to find out what the ratio of the rear end gear is as well as the transmission gears. I would appreciate any help locating a source of this info for 126 class cars.

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Old 09-17-2003, 03:29 AM
Derrel H Green
Posts: n/a
Rear End Gear Ratios?

Likewise, I'm wondering what gears are standard in and available for the '96 and later W-210 chassis.

Got a '99 E-300 Turbodiesel, and it may have the same gears as the E-320 gasser, but don't the E-420/430s have "taller" gear ratios?

Anyone ever try those higher V8 (lower numerically) ratio gears in the diesel for less revs per mile?

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Old 09-17-2003, 11:10 AM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,072
S-class with the 3.0L six should have a 3.46:1 axle. You can also cross check this with the following forumula.

Axle ratio = revs at 60/tire revs per mile

It should be within a few percent.

You can look up the tire's revs per mile by checking the "specs" for any 205/65R-15 (the OE tire size) tire on The Tire Rack site. The speed/rev relationship holds regardless of installed tire revs/mile. If the installed tire revs/mi are different than OE it will just add error to the speedo.

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Old 09-17-2003, 01:29 PM
Derrel H Green
Posts: n/a
Rear end ratio for W-210 '99 E-300?

Believing that the overdrive fifth gear ratio for the automatic is 0.83 and that the revs per mile for the E-300 diesel are approximately 2100 rpm, working backwards, one could figure that the rear end ratio is 3.07?

Crawling under and wiping the accumulated grim off a certain spot on the third member confirms that!

Using 814 revs per mile for the 215/55X16 Michelin MXV4s,

814 X 3.07 X 0.83 = 2074 revs per mile.

Wonder how the diesel would like the 2.82s or whatever is in the E-420/430 V8s?

Last edited by Derrel H Green; 09-23-2003 at 01:35 AM.
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