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Old 08-03-2008, 06:12 PM
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Join Date: Jul 2008
Location: Strong Island NY
Posts: 106
RPM range

What is the proper or excepted RPM range of a 83 300 SD at 60 mph w/14" (195 70 14)stock size tires? Will upping the tire size say to 225 50 16 bring it down? The engine revs at 3 (3,000) rpm at 65 mph...normal??
Thought it was rather's a automatic
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Old 08-04-2008, 12:59 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Normal is the diff gearing on them.

But , some guys run 215/75/14 on the stock rims ..that gives you a 2" diam difference [ from 24.7 to 26.7]
The 255/50/16 will only give you a difference of1.3" and you will have to buy 16" rims I think they are too fat for the chassis.
A Dalton
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