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2 truck questions
I have a K2500 GMC with the same size engine that I use to two my 45 HP tractor with backhoe. My engine is injected, but I do live at 5300 ft above sea level in the mountains.
Towing the tractor is certainly a load on the truck, but it handles it OK. Fuel economy goes into the toilet when pulling a trailer with the tractor at 70MPH, but it will do it even at this altitude.
I lived in CA years ago and I am familiar with the Grapevine, and I believe that I would have no problem with it. My truck does have a tranny cooler. I cannot say for sure that I could maintain full speed (70) on the steepest parts of the hill, but I would not expect 20MPH either.
When I moved from California to Albuquerque, I had to rent a 26 ft U-Haul to move the stuff that was too dangerous for the professional movers to handle. (You know stuff like paint, reloading supplies and the like) Now those things are very under-powered and I was still able to hold 35 MPH in the worst of the roads between Phoenix and Albuquerque. These roads are steeper and higher in altitude than the Grapevine, I believe.
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2 truck questions
My truck is a 1992 GMC K2500 with original throttle body injection. I like it better than a carburator but it is not the best injection setup. It always starts on the first crank, even when cold. So, I can't complain. It has been properly maintained and I have only used Mobil 1 in it since it was broken in. It has about 80,000 miles on it, and it does not use any oil. It has even served as a crew truck on the Baja 1000, twice, so those 80,000 miles are not to the mailbox and back.
I have a Hummer H2 that I drive for everyday, and it has a 6.0L GMC Vortec gasoline engine in it. For an engine that is about the same size as my GMC 5.7 in the K2500, the H2 engine puts out a LOT more horsepower. When I tow the tractor behind the H2, I have a lot more accelleration left. Of course, some of that may because of the big hole in the air that the H2 leaves for the tractor to go through.
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My 92 GMC does OK as I said before. I don't go fast partly because of idiot drivers and partly because I don't have a brake controller in that truck for the brakes on the trailer. I think that the GMC 5.7 gas engine in 92 was rated for 225 HP or so. This is not a hot rod; just a good reliable truck that always seems to be ready when I need it to do some work.
For perspective, I did tow a Baja race car halfway across the US with an 82 Toyota SR5 4X4 pickup truck. I think that the speed limits were 55 MPH back then. It is probably a good thing, because I don't think that I could have gone much faster.
The Toy could not have been doing much more than 120 HP, but it was pretty tough. It survived three Baja races as a chase truck running on the course with the big boys. But it is not a good tow vehicle.
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07-16-2003, 08:46 
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