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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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