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Discussion Starter #1
Ya I Know This Might Get Moved. But It Retains To Zf-6 Trucks.
Does An 04 Lb7 Zf Have Optional 4.10 Gears. I Bought It Used It Had 23,000 And Brand New Stock Tires. But At 80 Mph In 6th Its At Like 2700 Rpm Or So Maybe A Lil Less Is That Normal Or Sound High? Somebody Said Now Way Blah Blah That Its A 3.73 Just Wanted Your Input
 

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as far as I know there is no 4:10 with the diesel, auto or ZF
 

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The duramax was available only with 3.73's...however that does sound a little high in the RPM range. I run 315x70-17 and my speedo is off about 15%, so this may have me thinking lower RPMs.

MaxRock
 

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With stock 245s on and 3.73 gears, I'm in the 2300 rpm area @ 80 mph. Hope this helps.
 

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Time to get the jack out. Using the 4lo website calculators. 245/75/16's at 80 mph and 3.73's is 2468 rpm. Same setup with 4.10's is 2712.
 

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Discussion Starter #6
Thanks For The Input Guys I Am Gonna Get The Jack Out But I Got A Feeling The Tach Is Off Cause No Mods Were Done To This Truck B4 I Bought It.
 

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Seems like the replies are coming from guys with bigger tires and no dually. If you have a dually with the 215s and 3.73s, the RPMs are very high. I have the stock 215s and turn around 2400-2500 at 75 mph. That's just the way it is.
 

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I am right around 2600 at 80 MPH I wish they had a 3.54 or a 3.42 rearend available.
 

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The 215's on my work truck measure out at something like 29-29.5". My speedo is off, too, as a result. On my '03, it came with the Bridgestone v-steels, and they measured about the same. The '06 I ordered with the on-off road Bridgestone M773 or whatever they are. They measure out at about 30.5" When I put 265's on, or 235's on the dually, the speedo is right, and the revs come down...
 

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i turn 2300 at 80 mph with 265s
 
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