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  #1  
Old 03-08-2001, 12:46 PM
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Question, is there a difference in differential gear ratios between a 124 wagon and a sedan? Ed
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Old 03-08-2001, 02:29 PM
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Yes, the wagon has a shorter (numerically larger) rear axle ratio, I presume to overcome the slight weight penalty of the wagon. Don't have the ratios handy, though; perhaps someone else does.
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Old 03-08-2001, 04:02 PM
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Well it depends. The 300D and TD made in 87 both have 2.65 ratio. The 300E sedan has a 3.07 til 1989 when it changed to 2.87. The 300TE had 3.27 up till 90 when it also changed to a 2.87. So after 90 both sedan and wagon have 2.87. The E320 sedan and wagon have a 2.65 ratio.
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Old 03-08-2001, 04:26 PM
Grant Nelson
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Hi Steve:

You must have some sort of reference guide for rr ratios. I have a 1980 300D - non turbo. Could you please tell me what the ratio is for this car? Thanks.
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Old 03-08-2001, 04:35 PM
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That would be 3.46. The wagon would be the same that year.
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  #6  
Old 03-08-2001, 04:51 PM
Grant Nelson
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Thanks for the quick response Steve! Would you mind checking one more for me? I used to drive a '75 300d - same ratio??

The reason I ask is that the '75 was a much faster, quieter car than the '80. Also it would do all but the very steepest hills at 80+ mph. The 1980 slows down drastically on hills and even on the flat it feels like you want to shift to a higher gear.

As we speak, its with a mechanic having the pump timing checked, a valve adjustment done and the tranny adjusted. I'm hoping this solves the problem - but I'm really curious about the rr ratio difference between the '75 and the '80 - if there is one.

Thanks for your help!
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Old 03-08-2001, 06:39 PM
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The 75 also was 3.46. No help there!
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  #8  
Old 03-09-2001, 01:12 PM
Grant Nelson
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Here's an update on my 300D after yesterday with the mechanic:

1.Valves adjusted - weren't out by much
2.Timing was at 20 degrees - he set it back to factory 24.
3.Someone "not in the know" had played with the vacuum system - he spent an hour getting it back to specs. The tranny shifts much better now - not perfect - but I can live with it!
4.NOW THE BIG ONE: the car was originally from California. The injection pump was rebuilt at the same time that the engine was a few years ago. Whoever rebuilt the pump put it back to specs for California. My mechanic reset the pump to factory specs for Canada (where I live)--something to do with the governor I think.
Anyways, the car now performs equally as well as my old '75 300D. Drove up the longest hill in the immediate area - was at 80mph at the top - with more "jam" left if I wanted it!
I asked the mechanic if "tweeking" the pump will affect my mileage. He said it may even go up a little. That would be good, because I was only getting about 30 mpg (approx. 24mpg in US gallons!)

Cheers!

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