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  #16  
Old 07-14-2008, 06:19 AM
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Quote:
Originally Posted by sixto View Post
I'm going out on a limb but 4th gear is 1:1 on all MB 4-speeds since the 70s, AT and MT.

Sixto
87 300D
That's odd.....

I haven't heard of any 4 Speed Automatics that utilize a 1:1 4th gear.

Anyone have a chart showing the gear ratios for MB 4 Speed Automatics through the years ?

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  #17  
Old 07-14-2008, 04:49 PM
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Quote:
Originally Posted by Katmandu View Post
BTW, what are the rear end ratios on 190D Series ?
Here' you go Katmandu!

Model Ratio

107
450SL,SLC 1:2.65
450SL,SLC 1:3.06
380SL,SLC 1:2.47
380SL,SLC,560SL 1:2.47

108
280S,SE,SEL 1:3.92
280S,SE,SEL 1:4.08
280SE,SEL 4.5 1:3.27

113
250SL,280SL 1:4.08
280SL 1:3.93

114/115
220D,240D 1:3.92
280,280C,300D 1:3.69

116
280S,SE 1:3.69
300SD 1:3.07
450SE,SEL 1:3.06
450SE,SEL 1:2.65

123
230,240D 1:3.69
280E 1:3.58
300D 1:3.46
300DT to 84 1:3.07
300DT 85 1:2.88

124
260E 1:3.27
300D (1987) 1:2.65
300E 1:3.07

126
300SD to 85 1:3.07
300SD 85 1:2.88 ABS
300SDL 1:2.88 ABS
300SE,SEL 1:3.46
380,500 1:2.47
380,500,560SEL 1:2.47
420SEL 1:2.47

201
190D 2.2 1:3.42
190E 84-86 1:3.23
190E 84-86 1:3.23
190E 87-88 1:3.27
190E 87-88 1:3.27

Last edited by Katmandu; 07-15-2008 at 06:07 AM.
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  #18  
Old 07-14-2008, 05:36 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
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My '82 starts out in 1st from a dead stop. It also down shifts to first when the speed drops below 10 mph.
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  #19  
Old 07-14-2008, 06:18 PM
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Quote:
Originally Posted by Katmandu View Post
4,000 RPMs at 65MPH isn't right for any vehicle with an Overdrive transmission.

Something is keeping your transmission from getting in to Overdrive (4th Gear).

BTW, what are the rear end ratios on 190D Series ?
My old BMW ran at about 4000RPM at 70mph, i know its high but i've fiddled with it and thats just what it ran at. BTW it was a 318i.
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  #20  
Old 07-14-2008, 08:01 PM
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Quote:
Originally Posted by Katmandu View Post
That's odd.....

I haven't heard of any 4 Speed Automatics that utilize a 1:1 4th gear.

Anyone have a chart showing the gear ratios for MB 4 Speed Automatics through the years ?
Are you talking about 4th gear ratios in the transmission or differential ratios?

My reference for transmission ratios is Nitske's book.

Sixto
87 300D
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  #21  
Old 07-14-2008, 09:01 PM
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OK

The only time you will have a 1:1 ratio in automatic transmission is if it has over drive. The carrier will be locked to the plantary gearset in thetranny.

Mercedes transmission are geared similar to manual even though they are different in the aspect that the faster you go the smaller gear ratio you will have providing speed instead of torque.
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1991 190E 2.6(120k)
1983 300D(300k)
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  #22  
Old 07-14-2008, 09:33 PM
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I've lost track of the question but someone asked what the 4th gear ratio is and I repeated what I saw in Nitske's book

For the sake of discussion, I believe 1:1 describes the ratio between the transmission input and output shafts. It does not consider the effects of slip through the torque converter on engine rpm.

It is a reference to the mechanical design of the transmission, just as static compression ratio is a reference to the mechanical design of the engine. I don't know how an acceptable compression test result range of 350-400 psi (or whatever it is) confirms or rejects that static compression ratio is 22:1 (or whatever it is).

Sixto
87 300D
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  #23  
Old 07-14-2008, 10:06 PM
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Quote:
Originally Posted by Oracle12345 View Post
The only time you will have a 1:1 ratio in automatic transmission is if it has over drive. The carrier will be locked to the plantary gearset in thetranny.
Is this a typo? 1:1 ratio is "high" gear and not overdrive. Overdrive means that the output shaft spins faster than the input shaft.
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  #24  
Old 07-14-2008, 10:13 PM
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Quote:
Originally Posted by Matt L View Post
Is this a typo? 1:1 ratio is "high" gear and not overdrive. Overdrive means that the output shaft spins faster than the input shaft.
Yeah thats what I meant been a long day. 1:1 is when the input and outputs are spinning at the same speed. Overdrive is any gear ratio less than 1 henc 5 gear in a manual tranny
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  #25  
Old 07-15-2008, 05:35 PM
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Question

Quote:
Originally Posted by sixto View Post
Are you talking about 4th gear ratios in the transmission or differential ratios?

My reference for transmission ratios is Nitske's book.

Sixto
87 300D
Actually both. I found the rear end gear ratios (above).

I'm curious as to the Auto transmission ratios. Especially, 4th gear.
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  #26  
Old 07-15-2008, 09:22 PM
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Tranny and rearend ratios

4th gear is 1:1 in the W201 automatics. That's a fact. The only "overdrive" transmissions available in W201 cars are the non-Getrag 5 speeds. The Getrag 5-speeds in the 16V cars use a 1:1 5th gear.

To be sure about the rearend, check the numbers stamped into the rearend housing (assuming the gears have not been changed internally). You can find these numbers stamped in one of the "ears" located at the lower left hand and lower right hand corners of the rearend housing.

Then do the math to figure out the rpm's based on the rearend ratio and tire diameter.

SteveM.
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  #27  
Old 07-15-2008, 09:42 PM
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85 300D 4spd+tow+h4
 
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Quote:
Originally Posted by Actros617 View Post
my 300SD starts in second unless if the pedel is mashed down...
Time for some tranny work..... 2nd gear starts are a myth, they should start in first.
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  #28  
Old 07-15-2008, 09:44 PM
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85 300D 4spd+tow+h4
 
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Quote:
Originally Posted by Oracle12345 View Post
OK

The only time you will have a 1:1 ratio in automatic transmission is if it has over drive. The carrier will be locked to the plantary gearset in thetranny.

Mercedes transmission are geared similar to manual even though they are different in the aspect that the faster you go the smaller gear ratio you will have providing speed instead of torque.
Er no and no. 1:1 is *not* overdrive. Also in W123 the manual and auto are geared exactly the same (atleast in any manual you are likely to find here).

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