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Old 06-12-2003, 09:11 AM
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Differential swap

Howdy guys, I have a '82 300 D that has the low gear ratio diff. I want to put the diff from a '85 TD with the 2.83 ratio..anyone ever do this?..supposed to be a easy swap .. what needs to be changed for the speedo to work properly?..thanks for any replies
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Old 06-12-2003, 12:28 PM
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Join Date: Apr 2003
Posts: 345
gauge cluster
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Old 06-12-2003, 01:20 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
because of the speedo being specific to diff. ratio, many just do the math for MPH per 1000rpm of tack with the new gears and use the tack as a speedo guide...[ if you have a tach]

I have done this and you just get used to it....

Google has some nice RPM/Ratio speed calculators that are number plug-ins --- do a search...
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