3rd Gen High Performance and Accessories (5.9L Only) Talk about Dodge/Cummins aftermarket products for third generation trucks here. Can include high-performance mods, or general accessories. THIS IS FOR THE 5.9L ONLY!

37 inch Tires and Speedo RPM's

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Old Sep 17, 2004 | 02:01 AM
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localnet's Avatar
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From: SE MI
37 inch Tires and Speedo RPM's

I have the 315's, had the dealer recalibrate the speedo. Now I am going to go with 37's. What is the proper rpm to calibrate speedo?

Mike
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Old Sep 17, 2004 | 09:31 AM
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need to do some math, revs per mile
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Old Sep 17, 2004 | 10:11 AM
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look at the bfgoodwrench website...they will give you revs per mile at 45 mph...that is the most accurate number to use.
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Old Sep 17, 2004 | 10:14 AM
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I looked all over the BFG site, couldn't locate. Any idea where on the site that info is located?

Mike
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Old Sep 17, 2004 | 10:27 AM
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I called BFG, the computer needs to be set at 574, for the 37 inch BFG AT KO's.

Mike
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