Scott39
Adventurer
I'm still running the stock 3.55s with the 38.5" true height tires.
I got an average of 18.X on the entire trip with a best of 21.2mpg and a worst of 17.4mpg.
In general if I drive under 63 I get 20+, if I drive 75-80 on the interstate I get in the 17-18 range.
I think the perfect gearing will be 3.73 gears with the 5-spd manual transmission. I will be changing the rear axle to a slightly wider 14-bolt GM axle when I get an opportunity. 4.10s would work just fine also at the expense of speed on the highway. When I was running 35s and 3.55s I felt like the truck needed more legs on the interstate. The big tires fixed that no problem![]()
My engine is also basically stock, just an open element air cleaner and a 3" straight pipe. Living in colorado I REALLY need to install a smaller exhaust housing or change the turbo out. I have my eye out for a 04.5-06 he351cw Dodge turbo but haven't come across a good enough deal yet. That turbo should spool MUCH better and support all the power I can get out of the VE pump.
I like my 4:10s on the mtn passes here in Co. I also have a Gear Vendor overdrive in my truck, it was on the truck when I bought it.
I wouldn't want to run my truck without the OD and 35", 35" are still not tall enough for 4:10s. My OD is just like a 6pd. it really drops my rpms. And without any big load on my truck, I can run Loveland pass or any other passes at any speed I want using the OD.
I do plan on going with 38" tires when my 35" wear out.
I have my fuel plate all the way forward, and a after market air filter, the rest of the truck is stock.
Is it better to go with the turbo out of the newer Dodge's? I haven't read anything yet over on the Cummins forum's, not enough time.