Re: WD-9 and 1/2 ton truck
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As far as engines the newer engines are superior in power, economy, and longevity. The 350 gets <8 towing, 11 empty. The 5.3L (325 cid) gets 10-11 towing, 15 empty. Smaller engine, more power, better mileage towing, same tire size and gear set... Both trucks have the same final drive ratios. If the ratios are apples to apples, how can the RPM of power band be an issue if the 5.3L can out tow a 350? At 65 mph 3rd gear (both trucks) they tach at 3000 RPM, 2500 at about 55 mph. That is where the TQ band is. The HP band is much higher on the 5.3L, but the TORQUE is what tows!
Granted, below 2000 RPM the 5.3L is out of its power band, then it hits 2nd gear and winds up to about 4000 RPM and powers through. I climbed one hill on I-20 for about 3 miles in 2nd gear at about 55 mph. Did not hurt a thing, the modern engines are full roller motors with a 6000 RPM redline..
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