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#1
10-22-2007, 02:56 AM
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W116.120 taller gear recommendations
I'd like a taller gear in my SD...any recommendations? are all 116.xxx crown/pinion interchangable?
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RIP: 80 300SD RIP: 79 450SEL 2002 E430 4matic (212,000km) 2002 ML500 'sport'  ____________________________ FACEBOOK: PANZER450 
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#2
10-22-2007, 06:10 AM
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I would pass on the taller gear. This will adversely effect performance off the line. The high rpms on the highway do not adversely effect the engine. Plus your speedometer would be off.
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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12 1982 380SL 1978 450 SEL 6.9 euro restoration at 63% and climbing 1987 300 D 2005 CDI European Delivery 2006 CDI Handed down to daughter 2007 GL CDI. Wifes 
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#3
10-22-2007, 06:25 AM
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I would change the gear ratio with no regrets if I wanted longer engine life and better fuel economy and didn't mind a little softer performance off the line.
Rather than change the ring and pinion I would change the entire center section. It is pretty easy to find used units, they are almost never worn out, and the labor to change it is not that bad. I have paid about two hundred for a center section used, and labor was between two and three hundred at my indie. Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#4
10-22-2007, 08:42 AM
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Two different diff cases.....
for the car series you mentioned, you can source a diff from a W116, W123, W126, and R107 IF the donor car is an inline engine, and it's a plug and play operation. Your best bet is to find a 85 300D or 300SD with the 2.82(?) diff.
V-eights have a larger diff case. You can still interchange, but it's potentially more involved.... I recall it is a 1 liter case for the inlines, and a 1.3 liter case for the eights. Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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