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Old 03-04-2015, 07:09 AM   #1
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Chevy 6.0 vs Ford 6.8

I'm towing a TT around 7k lbs loaded (5,800lbs dry weight). Most of my trips will be through the hills of WV.

I would always rather have more truck than less. I'm looking at older trucks wth higher miles as this is a 3rd vehicle that won't be driven much.

Am I going to notice a big difference towing between the 6.0 and the 6.8 or even the Silverado 8.1?

There are a lot more 6.0's out there with good deals, but something inside me says go for the bigger motor.

Anyone tow with these trucks that can make a comparison?
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Old 03-04-2015, 10:34 AM   #2
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Go with the bigger motor. I bought an'03 GMC with the 8.1 just for RV use and emergency back up transportation and I've been very happy with it. It's much more enjoyable to drive in that it doesn't hunt for gears like my old 350 did. Now if you could find one with 4.10 gears it would be even better. There are still some of the 8.1's around with low mileage but I've noticed that they are pricing them higher than they were a couple years ago when I found mine. Mine had 50,000 miles on it at the time of purchase. This one has 61,000 miles but it ain't cheap.


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Old 03-04-2015, 10:41 AM   #3
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Forgot to add that fuel costs for me have stayed about the same as compared to my old 350 when pulling. I get between 7.6 and 8.2 when pulling, using plenty of fuel but we only get out about 7 times a year. It would have cost me $10,000.00 more for a comparable diesel when I bought the 8.1. I had one found but just couldn't justify the extra 10 grand just to get a diesel home instead of the gas for what I was going to do with it. The 8.1 turns about 2300 rpm at 75 mph down the interstate in overdrive. My old 350, I wouldn't take it out on the interstate because it wouldn't pull it in overdrive. The 8.1 will run with the cars...
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Old 03-04-2015, 10:48 AM   #4
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There is a BIG difference in the Chevy 6.0 engines over the years. We towed a horse trailer with a 1999 Silverado 2500 for about 10 years before buying a new 2009 Chevy 2500HD CC 6.0 and the newer version has a bunch more power. I do not remember what years GM jumped the HP.

In my part of the country the Chevy/GMC trucks with 8.1 power command a premium price IF you can find one. Also Remember unloaded a newer 6.0 will get about 50% better fuel mileage than a 8.1.

Also some Ford 6.8 engines have sparkplug thread issues. Someone else here should be able to tell you what years have that prospective issue.
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Old 03-04-2015, 11:36 AM   #5
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Need to know what ywars you're looking at or price range you want to stay within. The 8.1 stayed relatively unchanged from 01-07(classic) minus about 15hp/Tq. The 6.0 recieved the 6spd tranny in about 08 or 09 and apparently that makes a huge difference. Comparing my 02 8.1 to my dad's 00 6.0 is like comparing a corvette to a cavalier. And I actually get better mpg all around. The 6.8 improved in 05 to the same output as the 8.1 as far as power and was available to I think 2012 which is a big plus for it since the 8.1 was taken to the chopping block in 07.
My opinion is 09+ 6.0 or 07 classic 8.1 with the allison tranny. Not a ford fan but if you are then 05+ 6.8
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Old 03-04-2015, 12:37 PM   #6
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The '07 6.0 makes 360 ft lbs. of torque at 4000 RPM and 320 ft lbs at 2000 rpm. The 8.1 makes 455 ft lbs. at 3200 rpm and over 400 ft lbs yet at 2000 rpm. If the 6.0 can't hold 65 mph at 2000 rpm in over drive it will shift down and cruise near 2600 rpm in the next lower gear. It will then be moving 275.3 cfm of air (CFM=CID X RPM X VE over 3456). The 8.1 at 2000 RPM moves 287 CFM, very close to the same air flow through the filter as the 6.0 at a higher rpm due to not enough torque to hold the cruising speed. Torque translated to pulling power and horsepower equates to how fast the vehicle will accelerate (do work faster). My old Mack Superliner with the 350 horse motor had 1800 foot pounds or torque at 2100 rpm max. Some of the other guys back in '88 had the 440 horse V8 and those trucks were definitely faster!. If I was shopping now for an 8.1 I'd look for the '06 or '07 with the 6 speed Allison for a little better unloaded MPG. They are workhorses!
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Old 03-05-2015, 08:59 AM   #7
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I have the 6.0 in my 2004 GMC 2500HD. I regularly haul my on/off road jeep on a trailer. It's got more power than I'll ever need. I get about 8 mpg hauling the jeep down the pike and about 12 every day back and forth to work driving.
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Old 03-05-2015, 09:16 AM   #8
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I just got a8.1 whipple supercharger 2001 3500 and can't wait for spring
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Old 03-05-2015, 10:38 AM   #9
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The bottom line on the gassers.... Get into late enough models that it has VVT (variable valve timing). VVT makes a big difference giving you the full performance spectrum from UGH! to OMG! all out of the same engine. By retarding or advancing the cam(s) you can have the torque rise earlier at lower rpms and remain flatter through the rpm range and still scream by the slowpokes when you need passing power.

GM started VVT on the LS based engines in '07 and had VVT in all pickup engines by '10. Ford started VVT on 5.4 Tritons in '04. None of the 6.8 V10 are VVT, but atll the 6.2s have VVT. I think Ram's started getting VVT with the GenII 5.7 Hemi in '09.

The other advantage with later models is the extra 2 or more gears to work with in the transmissions.

My 2011 6.2 VVT with a 6spd auto is a night and day difference in both performance and economy over the 2003 6.0 4spd auto it replaced.
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Old 03-06-2015, 06:50 AM   #10
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They are all good motors. If you are a horsepower nut stay with the bigger motors the 8.1 has more torque and cubic inches 496 than the ford V10, but they will both out pull a 6.0. I have two trucks with 6.0's and I am very happy with them.
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Old 03-06-2015, 09:07 PM   #11
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So right now I'm pulling my TT with a '13 Toyota Sequoia. I take it from the replies that pulling 7k lbs with any of these trucks will be a big improvement from what I have now?
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Old 03-07-2015, 05:21 AM   #12
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Quote:
Originally Posted by jeremy123 View Post
So right now I'm pulling my TT with a '13 Toyota Sequoia. I take it from the replies that pulling 7k lbs with any of these trucks will be a big improvement from what I have now?
Yes but power won't be the biggest improvement as im sure the Toyota has plenty of guts too. The Toyota is basically a sport truck for people who want a truck but not a "TRUCK TRUCK" The major improvement will be moving to a truck that was built to tow and haul. A stiff frame big brakes, big payload numbers, and rock solid stability going down the highway.
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Old 03-07-2015, 06:31 AM   #13
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Forget the gassers.Get a 6.6 duramax.
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Old 03-07-2015, 11:17 AM   #14
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Quote:
Originally Posted by jeremy123 View Post
So right now I'm pulling my TT with a '13 Toyota Sequoia. I take it from the replies that pulling 7k lbs with any of these trucks will be a big improvement from what I have now?
Pulling power is not your primary problem. You have enough "tow rating" to pull a 7,000-pound TT. But your SUV is overloaded over the GVWR of the tow vehicle if you have anything inside the SUV more than a skinny driver. And I'll bet you have a lot more in the SUV than a skinny driver.

Weigh the wet and loaded rig on a CAT scale. Add the weight on the two SUV axles and compare to the GVWR of the SUV.

For the replacement tow vehicle, don't worry about "tow rating" or GCWR as long it's higher than the heaviest possible combined weight of your wet and loaded tow vehicle and trailer. Instead, get a tow vehicle with enough GVWR (payload capacity) that you can haul all your family and stuff and a full tank of fuel, as well as the weight-distributing hitch and tongue weight of the TT, without exceeding the GVWR of the tow vehicle.

It's certainly not obvious by looking only a the tow rating or GCWR. For example, my F-150 EcoBoost has a tow rating o 8,400 pounds, and it has plenty of power to tow a TT that grosses 8,000 pounds. But the suspension is overloaded when wet and loaded on the road with my small TT that grosses only 4,870 pounds.

I'm a Toyota fan. My cars have been Toyotas since 1986. My current "car" is a 2013 Venza. The Tundra (and the Sequoia which is a Tundra chassis with a heavy station wagon body) is a dependable half-ton pickup, but it's only a half-ton pickup, and not enough GVWR to haul a 7,000-pound TT plus a family and tools without being overloaded. So forgetabout a Toy and look to the "big three" pickups with at least a so-called three-quarter ton weight rating. They will all three have enough GVWR to tow a 7,000 pound TT without being overloaded.

The 2015 F-250 with the smallest gas engine (6.2L) and stock rear axle ratio has GVWR of 10,000 pounds and tow rating over 12,000 pounds. That's enough to tow your 7,000 pound TT without any concern with being overloaded.

If you insist on a half-ton pickup, then the only one with enough GVWR to tow a 7,000-pound TT plus family and gear without being overloaded is the F-150 with the factory HD Payload package. Those are rare, and you probably won't find any on dealers' lots. You can order one and wait 6 to 8 weeks for it to be built. My last several vehicles had to be ordered to get exactly what I wanted. The 6 to 8 weeks is frustrating, but it beats driving a vehicle for years that's not exactly what I want. Even my latest runabout had to be ordered - Mazda MX5 Miata with power retractable hard top (PRHT). Fun little car, but it won't tow erven a tiny trailer.
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