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I may need to replace the differential in my 81 240d manual trans I have one from a 300d and wonder if it will fit my car. I think it will but I'm wondering if the gearing is different and how that might affect driving Thanks
 

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I may need to replace the differential in my 81 240d manual trans I have one from a 300d and wonder if it will fit my car. I think it will but I'm wondering if the gearing is different and how that might affect driving Thanks
Assuming symptom is whining noise, try flushing it w/GL5 spec 85w-90, Full Synth. Do this a couple of times at 200mi intervals. Then, refill & use same. Should fix it. Full Synth lubes were introduced much later. So, it does not appear on MB official list of recommended lubricants of that time. Considering your relatively low h.p. engine output, a gearing mismatch could lead to significant disappointment. b.t.w., 300D was 5 cyl w/much higher h.p.
 
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