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#1
01-22-2007, 03:15 PM
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3.07 to 2.88 speedo change?
My weekend job is going to be swaping rears in my TD and replacing the axle shafts. From my searching I found that it really isn't worth it to change the speedo around to calibrate for the 2.88 gears. Is this true?
Thanks
__________________
-Randy Wakefield 1969 220D 4 speed (parts car) 1976 280C 1976 280S 1981 240D 4 speed (parts car) 1982 300D 1983 300TD (Ivory) 1983 300TD (gold) 1985 300TD (gray) 1987 190D 2.5 1970 280SEL (sold) 1977 240D 4 speed (sold) 1974 280 (rusted to death) --- 1927 Chevy 4 door sedan 1938 Chevy 2 door sedan 1950 Willys Jeepster 1955 Studebaker President 4 door 1977 Ford F250 1979 Glastron 17' 1948 John Deere A 1960 John Deere 2010 1979 Satoh S650G -- 2000 Bichon (Doby) 
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#2
01-22-2007, 03:41 PM
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Not worth it at all. You'll probably have a more accurate instrument reading than you did, once you change out the differential. Seems the odometers are always calibrated to read higher than you are actually going - to slow you down a bit. Once you change out the differential, it will be closer to the actual speed you're going if your experience is like mine.
Your mileage (pun intended) may differ.  Ken300D
__________________
-------------------------- 1982 300D at 351K miles 1984 300SD at 217K miles 1987 300D at 370K miles
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#3
01-22-2007, 04:05 PM
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When I swapped out the 3.07 with a 2.88 in the 300D, the speedo error was about 5 mph. I found a speedo out of a car with a 2.88 and installed it in the cluster. Easy fix.
__________________
Never a dull moment at Berry Hill Farm.
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#4
01-22-2007, 07:13 PM
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Your old speedo should read about 6-7% too low with the new gears. You have to decide if that's OK or not. If you can find a speedo from a 85 300D or 300TD, it should work correctly with the 2.88 gears.
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#5
01-22-2007, 08:44 PM
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Hey guys thanks for all the good information. Since I have the whole `85 300TD I think I might go ahead and change the speedo. I wasn't sure if it was the speedo, or if it was the gear(s) in the tailshaft that needed changing, kinda like its American counterparts. Thanks again guys, I can't wait to see if it makes a difference.
__________________
-Randy Wakefield 1969 220D 4 speed (parts car) 1976 280C 1976 280S 1981 240D 4 speed (parts car) 1982 300D 1983 300TD (Ivory) 1983 300TD (gold) 1985 300TD (gray) 1987 190D 2.5 1970 280SEL (sold) 1977 240D 4 speed (sold) 1974 280 (rusted to death) --- 1927 Chevy 4 door sedan 1938 Chevy 2 door sedan 1950 Willys Jeepster 1955 Studebaker President 4 door 1977 Ford F250 1979 Glastron 17' 1948 John Deere A 1960 John Deere 2010 1979 Satoh S650G -- 2000 Bichon (Doby)
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#6
01-22-2007, 10:49 PM
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Let me know how it goes. I have a 2.88 diff and cluster to go into my '84 for almost 2 years now..... Finally getting to it. RT
__________________
When all else fails, vote from the rooftops! 84' Mercedes Benz 300D Anthracite/black, 171K 03' Volkswagen Jetta TDI blue/black, 93K 93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K
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