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Open Roads Forum  >  Tow Vehicles

 > 1981 Chevy Truck vs Ford Truck

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mkirsch

Rochester, NY

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Posted: 08/18/22 06:48am Link  |  Quote  |  Print  |  Notify Moderator

Labman7 wrote:

Had a 1980 GMC 3/4 with the 292 six and 4:56 axle. I drove it all over the National Parks of the west for 4 years with a 9 1/2 Coachman truck camper on it. Never had any problems anywhere driving through the mountains or on the flat land. It was the same engine they put in school buses. The body was going with rust is the only reason I got rid of it. Oh, yeh. It got 10.6 mpg with or without a load, in the mountains or not. And top speed was 78 mph.


78MPH, empty, downhill, with a tailwind I'd imagine. With 4.56 gears and no overdrive that poor 292 had to be screaming.

Yeah, I figured it out. With 4.56 gears and 30" tires, the engine would be turning 3985RPM to do 78MPH.


Putting 10-ply tires on half ton trucks since aught-four.

blt2ski

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Posted: 08/18/22 07:02am Link  |  Quote  |  Print  |  Notify Moderator

Iirc, my 292 redline was about 4000 rpm at best. Best RA for the 4sp manual was 3.42 gears. Decent low end, 2000 or so rpm at 60 mph...
My IHC has a top speed of 72 mph, at 3000 rpm in direct with 4.33 gears, 31.5" tires, it could use an OD when empty.


92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
2014 Chevy 1500 Dual cab 4x4
92 Red-e-haul 12K equipment trailer

FishOnOne

The Great State of Texas

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Posted: 08/18/22 07:44am Link  |  Quote  |  Print  |  Notify Moderator

blt2ski wrote:

The 4.3 carb versions were 2bbls. approx 180hp. the TBI was 195 or so, the vortec 210'ish. That motor was designed for the pickups and Astro vans. 85-86 or so was first year, replaced the 250 I6 in the 1500. I could see someone putting a 4bl on the 4.3 and waking that motor up! the 2bbl was as slug. The TBI not too bad, the vortec a different beast yet. The 4.3 I have in my 14 is on par with the TBI/4bbl 454s Ive had over power wise.
The 292 I6 1BBL was base motor in the square body truck to about 87, then 88-90 when GM started making a DW 3500 the base motor was a 350, 454 and 6.2 diesel with options.
The 88 model year GM CK trucks, the 4.3 was base motor for the 6600 gvw 1500, 7200 6 lug 2500, and the 8600 8 lug was a 3500. 89 or 90, the 8600 2500 came out, with a 9200 3500 sw. 91 or 92 was the 10K DW versions. Also about 90 with the 8600 2500, the 4.3 was dropped in favor of the 350 base for motor. the 3500 also had a 350 base, with a 454 and 6.2 option. a year or two later, the 2500 got the 6.2/454 option. 6.5td came out in 94 with the 6.2 going away.
You could get a 292 in a 25 or 35 series van, with 3.42 gears and a munci 4 spd, those rigs got 17-20 mpg vs a 4.1 geared as noted, about 10-11 no matter what you were doing! I got 15 once playing games in neutral going down some long downhills, like chinook pass locally with my 81 reg cab. could out pull my 88 tbi/89 4bbl 454s at low speeds, but once the BB's got to 20 mph, they left the I6 behind.
Dad had a 66 1500 with a 250 three in the tree, he could get 15-18 with it. Not sure on the rear gear ratio. He sold it, next person put a 4 sp and 350 in it. Chassis had over 300K miles last I heard about. A lot of boats had the 250 in I/O configs too. Our 16' Chris-Craft, a number of others I knew too.

Marty


I'm pretty sure the first Gen 4.3 had four barrel carbs and the name "Vortec" for Vortec heads originally came out on the 4.3 engine.

[image]

[image]


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larry barnhart

wenatchee. wa usa

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Posted: 08/18/22 08:20am Link  |  Quote  |  Print  |  Notify Moderator

I had a new 1986 chev 1/2 ton with the V-6 and 4 barrel carb a 400 turbo trannie and a rear diff of 2.73. Seemed to be odd but was ok for my work truck.

chevman


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blt2ski

Kirkland, Wa

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Posted: 08/18/22 09:06am Link  |  Quote  |  Print  |  Notify Moderator

Pickup may have had a 4bbl. The Astro I drove had a 2 bbl.

FishOnOne

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Posted: 08/18/22 03:30pm Link  |  Quote  |  Print  |  Notify Moderator

blt2ski wrote:

Pickup may have had a 4bbl. The Astro I drove had a 2 bbl.


I thought those Astro vans were good looking. A hell of lot better van than the ugly Lumina van.

Grit dog

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Posted: 08/18/22 03:54pm Link  |  Quote  |  Print  |  Notify Moderator

FishOnOne wrote:


I thought those Astro vans were good looking.


Are you feeling ok?


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
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BarabooBob

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Posted: 08/18/22 05:37pm Link  |  Quote  |  Print  |  Notify Moderator

I had a Chevy Astro with 4.3 injected. We puled a pop-up back then and pulled it all over the Rockies without a problem.
We drove it from WI to NC one time and I told the wife that we were going to jump in thee middle of the fastest group of cars and I didn't care what mileage we got. I wanted to get there asap. We drove from Baraboo (WI) to Indianapolis at about 85 mph. I stopped there to get gas because I thought we should be out of gas. When we calculated the MPG and we got 22 on that tank. I could not believe it.


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Me Again

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Posted: 08/18/22 06:15pm Link  |  Quote  |  Print  |  Notify Moderator

Both the GM 292 I6 and Ford 300 I6 were good engines. I removed a 292 from a 63 sub and put nice 283 in it's place in the early 1970's. Did better on the freeway with the V8, however no more pulling building over.


2021 F150 2.7 Ecoboost - Summer Home 2017 Bighorn 3575el. Can Am Spyder RT-L Chrome, Kawasaki KRX1000. Retired and enjoying it! RIP DW 07-05-2021


FishOnOne

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Posted: 08/18/22 06:23pm Link  |  Quote  |  Print  |  Notify Moderator

mkirsch wrote:

FishOnOne wrote:

Grit dog wrote:

Straight 6 was available thru at least '86 in the 3/4 - 1 tons. 1/2 tons base option changed to the 4.3 V6 in the 80s.


I remember seeing plenty of half tons with the I6 and later the 4.3 V6's with a 4 barrel carb which was pretty cool, but neither had the power of the 5.0.


Well duh, that was in the days of "there is no replacement for displacement." Need more power, add more holes, or make the holes bigger. Turbos were for weenies. Superchargers were for those delinquent greasers who raced cars in a straight line.

Though I have a hard time believing that a GM 305 was out-pulling all those other engines, unless it was pulling a LOT less, or something was done to it to pep it up. Even today the 305 is regarded as a joke.


I want to say GM made a push towards these V6 engines sometime in the late 80's. Even Buick was running V6 engines in their NASCAR cars.

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