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Old 10-28-2009, 01:19 PM   #1 (permalink)
GMC_GUY
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Towing Capacity of 6.5

I love to collect GM original sales brochures and I was looking at a couple of 90's truck ones that I have and they say the towing capacity for a 1500 4x4 is a mere 6000 lbs. But obviously people are pulling MUCH more than that. Any thoughts?
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Old 10-28-2009, 01:30 PM   #2 (permalink)
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I believe your door sticker will have recommended weights and whatnot... Can't remember though but others will chime in I'm sure.
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Old 10-28-2009, 01:40 PM   #3 (permalink)
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GM seemed to under rate their towing capacity. I remember looking at the ratings in the eary 90s. A 1 ton with a 454 and t400 with 4.56 gears was only rated for 10,000lbs. It would easily towed double that. My 92 6.5 w/3.42 gears has no problem with 10,000lbs.
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Old 10-28-2009, 01:45 PM   #4 (permalink)
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The towing capacity of the 6.5L in my 1995 GMC Sierra K2500 is 7500lbs. The towing capacity is generally relative to the suspension of the vehicle and the wheel base. I would think that the 1500 could tow as much as the 2500 with the same drivetrain but you might run into stability issues with lighter duty suspension and shorter wheelbase.

There were four different wheelbases offered, reg cab short bed 117.5in, ext cab short bed 141.5in, reg cab longbed 131.5in, and ext cab longbed 155.5in.
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Old 10-28-2009, 01:56 PM   #5 (permalink)
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Is it safe to assume that a 6.5 can pull as much as a 454 or am I way off?
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Old 10-28-2009, 02:00 PM   #6 (permalink)
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94 6.5 CC 1 Ton 4X4 LWB SRW pulled 18,000 lb triple axle trailer with total GCVW of 25,000 'bs many times with out a problem. 14 ply tires on truck. A little underpowered, but did it including CA famous Gravevine and the Rockies.
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Old 10-28-2009, 02:08 PM   #7 (permalink)
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Quote:
Originally Posted by gardnerteam View Post
94 6.5 CC 1 Ton 4X4 LWB SRW pulled 18,000 lb triple axle trailer with total GCVW of 25,000 'bs many times with out a problem. 14 ply tires on truck. A little underpowered, but did it including CA famous Gravevine and the Rockies.
Unbelievable!
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Old 10-28-2009, 03:24 PM   #8 (permalink)
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Quote:
Originally Posted by primo382 View Post
The towing capacity of the 6.5L in my 1995 GMC Sierra K2500 is 7500lbs. The towing capacity is generally relative to the suspension of the vehicle and the wheel base. I would think that the 1500 could tow as much as the 2500 with the same drivetrain but you might run into stability issues with lighter duty suspension and shorter wheelbase.

There were four different wheelbases offered, reg cab short bed 117.5in, ext cab short bed 141.5in, reg cab longbed 131.5in, and ext cab longbed 155.5in.
It is more on the limits of the power train then suspension. Changing rear end ratios gets you different towing ratings. The transmission or cooling system can be a limiting factor.
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Old 10-28-2009, 03:28 PM   #9 (permalink)
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Suspension still plays a part of the towing capacity...
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Old 10-28-2009, 03:47 PM   #10 (permalink)
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Many times the GVWR of a vehicle is rated to the weakest part of that vehicle. For example, I looked at a freightliner log truck that had a #20,000 front axle in it from factory, but was shipped from factory with 11R24.5 tires on it. The door sticker rated the front axle at #5500 because of the small tires. I wonder if the 6 ply tires factory on most 1/2 tons are part of rating considerations?
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