The 3.4 is an amazing engine. At 300K it does not burn any oil. I’ve only done regular maintenance. I did have some framework done on the cross member above the exhaust. Rest of frame is solid. What a great truck!
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The circumference of a 265/75/r16 is 31.6. The stock size on 1st gens is 265/70, 30.6, and circumference of 96.13. 33's sometimes run small in true diameter, 32.5 for BFG, 32.8 for goodyear MTR. I run BFG ATs(102.1circ), so for me it's more like 6%. (I'd been using 6% whenever I run MPG calculation for the last 15 yrs, wanted to make sure my math was close)Curious thing I found the other day was a mileage calculator based on tire size changes. IIRC going up 1" in tire size lowers the odometer reading by 10% for a 265/75/r16 from stock. So my odometer reads 225K but in reality my truck is at about 250K.
Random but I found it interesting.