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#1
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123 Differential Question
I need to replace differential of of my 1977 240-D 123 series because of the noise. The ones that are available with the old parts dealers have differentials of the following "ratio" and I am not sure which one would be the best. Help would be highly appreciated.
(a) 3.69 (b) 3.92 and (c) 3.48 I am told by some one that if the ratio is higher (eg 3.92) it is better then when the ratio is lower (eg 3.48). Please comment on this too. Regards |
#2
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The W123.123(240D) chassis uses a 3.69/1 ratio.
The 3.92/1 ratio was used in 1969 to 1975 220D's The 3.46/1 ratio was used in the 1977-1981 300D non-turbo.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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Thanks MB Doc.
I am also told that there is another differential off a petrol MB with 49 grooves ( ratio not known to me). If I install it in my non-turbo 240-D 123 series, will it be any good in it? Will there be any improvement in acceleration? Regards |
#4
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Need some more help please!
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#5
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A higher number will give you higher revs (and consequently better acceleration). The drawback is that your engine will rev higher at cruising speed. So you're fuel economy will decrease, and your engine will be louder at a given speed. Additionally, your speedometer will be inaccurate if you change from your original gearing.
In the case of a differential with a gear ration of 3.69/1 ("3.69 to 1"), what the numbers are actually telling you is that the wheels will turn 3.69 revolutions for every 1 revolution that the driveshaft turns. So a differential with a "higher" number is said to be geared "lower". Hope that helps. Jeff Pierce
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Jeff Pierce Current Vehicles: '92 Mercedes 190E/2.3 (247K miles/my daily driver) '93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk) '99 Kawasaki Concours Gravely 8120 Previous Vehicles: '85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon '53 Willys-Overland Pickup '85 Honda 750F Interceptor '93 Nissan Quest '89 Toyota Camry Wagon '89 Dodge Raider '81 Honda CB 750F Super Sport '88 Toyota Celica '95 Toyota Tacoma '74 Honda CB 550F |
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