I don't lug it. My low-torque 6.2 engine wouldn't last very long if I drove like that.
I've had 3.73s, 4.10s, and 3.42s. The 3.08s work best overall for what I use the rig for. I don't use OD when driving up in the mountains and only drive in 3rd. When driving 65-80 MPH on the highway, I use 4th OD.
In 3rd and driving at 55 MPH, my engine is at its peak torque-curve at 2000 RPM. That's all I use in the mountains.
On the highway, in 4th at 70 MPH, the engine is still in the peak curve at 1800 RPM.
I might stick in the 3.44 axles sometime, but I don't want the 3.73s. Too much revs. If I was doing any towing, then I'd definitely want the 3.73s or 4.10s.
I built this thing as sort of fuel-mileage experiment, thus my concern for revs. I've been fooling around for years with motorhomes and campers, trying to come up with a high-fuel-mileage rig. So far, this 4WD Blazer has done the best at 17 MPG.
My Dodge with Cummins 5.9 and truck camper on the back did almost as well at 16 MPG. It has 3.50 axles and I wish it had 3.07s instead. I suspect it would be the best mileage rig if I had those axles, but they are scarce for Dodge diesel trucks.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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