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Old 11-08-2014, 07:39 AM   #29
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2.7 liter V6 is 8500 lbs towing. 3.5 liter ecoboost is over 12000 lbs towing. Would I do it on a normal bases. No.

Its kind of funny that no body thinks V6 engine can have the power or torque to do the work. Back in the late 60's early 70's GMC truck had V6 engines that could run larger GPM fire pumps than there own V8 engines in fire truck chassis. The big problem back then was distributers and carburetors that would go out of adjustment. New fuel injection and coil on plugs only make them better.
Back in the 60's and 70's they did NOT have V-6 motors in GMCs. They were Inline (I) 6s. The V-6 motor did not become an option till the 80s in the GMCs.

The old (I-6) inline 6 in GMs were 250 cu in and Ford had a 250 and a 300 cu in I-6. They were stump pullers. Tons of torque, especially if coupled to a transmission with the Granny gear. It was geared so low, you could put it in gear, let out the clutch, and it would go as slow as granny walking. Dodge had the S-6 or Slant 6. The block sat in the engine compartment at a slant vs the upright I-6.

The 300 I-6 was available till 1997 or 1998. I had a 1996 F150 extended cab with the 300 I-6. It got 13.5 mpg no matter how I drove it, weather or not it was empty or hauling, towing, driving it easy or dogging it. It could out pull a v-8 all day long. Could not kill those old I-6s either.
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Old 11-08-2014, 08:48 AM   #30
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Every Ford I-6 I had developed an exhaust leak, but it was a good puller.
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Old 11-08-2014, 09:16 AM   #31
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Back in the 60's and 70's they did NOT have V-6 motors in GMCs. They were Inline (I) 6s. The V-6 motor did not become an option till the 80s in the GMCs.

Need to bone up on your GM truck history some, Chevy used both I-6's and V-8's in there light and medium duty trucks while GMC used large displacement V-6's from 305 to 478 cid in their trucks.
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Old 11-08-2014, 09:23 AM   #32
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I had a 1995 Ford E-150 wheel-chair van with a 300 I-6. It was a decent engine, but just as thirsty as the V-8s and not nearly as much power for hot-dogging.

Back in the late 1950s, I went off to college and Dad traded the worn-out 1950 Dodge pickup for a new 1958 Ford half-ton with the straight six. My two younger brothers hated that pickup because it was the slowest vehicle in the high school parking lot. Dad wasn't real happy with it either because it wouldn't pull a loaded grain trailer out of a sandy field the way the old Dodge could. He soon traded it for an F-250 V8 stump puller that got awful gas mileage, but it could get the trailers out of the field.
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Old 11-08-2014, 03:00 PM   #33
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Need to bone up on your GM truck history some, Chevy used both I-6's and V-8's in there light and medium duty trucks while GMC used large displacement V-6's from 305 to 478 cid in their trucks.
I went and googled what you said. You were right, but I have to ask - What size GMC trucks were they available in? Were they the standard pickups of 1/2, 3/4,and 1 ton configurations? Or were they the GMC medium duty Tow trucks, moving trucks, flat beds, and Coke a Cola trucks? I never came across them in the mud trucks or daily drivers me and my friends had.
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Old 11-08-2014, 03:46 PM   #34
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1/2, 3/4, and 1 tons had the 305 big block V6 as the competitor to Ford Dodge and Chevrolet V8's from 60 to 66. Inline (Chevrolet) 6's were also available as base engines in the GMC's

There was also a 637ci V8 based on the V6's design and a 702ci V12 "Twin Six" that was actually 2 351 V6's cast into a single block using 4 heads, 4 valve covers, 4 exhaust manifolds, 2 intake manifolds, 2 carburetors and a doubled distributor.
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Old 11-08-2014, 09:44 PM   #35
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1/2, 3/4, and 1 tons had the 305 big block V6 as the competitor to Ford Dodge and Chevrolet V8's from 60 to 66. Inline (Chevrolet) 6's were also available as base engines in the GMC's

There was also a 637ci V8 based on the V6's design and a 702ci V12 "Twin Six" that was actually 2 351 V6's cast into a single block using 4 heads, 4 valve covers, 4 exhaust manifolds, 2 intake manifolds, 2 carburetors and a doubled distributor.
The '65 GMC 3/4 T fire truck I drove in '69 had the 305 V-6. Only truck in the fleet that similar no road performance was a '63 Power Wagon...with an inline slant six. That Dodge was even slower on the highway than the Jimmy...
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Old 11-09-2014, 06:01 PM   #36
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Dodge developed the slant 6 for the lower hoodline for the 60's cars. You could not kill those at the time, similar to the 318 V8. My experience was that the new EGR system ruined its popularity.
Had a Plymouth Volare that was doing over 21 mpg but self distruct in 6 years and 220k miles with 3 transmissions and 2 engines. Cancelled the EGR to save the second engine.
Sounds fimiliar?
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Old 11-09-2014, 06:28 PM   #37
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Dodge developed the slant 6 for the lower hoodline for the 60's cars. You could not kill those at the time, similar to the 318 V8. My experience was that the new EGR system ruined its popularity.
Had a Plymouth Volare that was doing over 21 mpg but self distruct in 6 years and 220k miles with 3 transmissions and 2 engines. Cancelled the EGR to save the second engine.
Sounds fimiliar?
That slant six looked sort of lost in the engine bay of a Power Wagon! But with right gearing, it was also a stump puller. Got stuck going up hill once on a old logging trail. Buried so deep was pushing dirt with door when I got out to look it over. Before unreeling the PTO winch cable, decided to give it one more try. Granny, low range and that thing walked right up the hill. I think any of the V-8's in the fleet would never have gotten out on their own power, you just had to rev them up too much to get the torque. (and yes, I learned my lesson and never attempted a hill that steep in anything other than the lowest gear...lol)
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Old 11-09-2014, 07:32 PM   #38
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Easy.

2 people @ 225#/ea. = 450#

60% partial load of top soil: 38 cu ft @ 75#/cu ft =2850# (6.5' bed is 62 cu ft)

Total = 3300#
LOL. You sure overloaded the F150 4050 or 4800 RAWR with just your 2850 lbs of top soil.

However this is a RV forum and we think of payloads in term of a TC or a trailers hitch weight which the rear axle carries most if not all of the load.
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