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towing capacity

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by bergst, Nov 23, 2002.

  1. bergst

    bergst Newbie

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    What is the max towing capacity for a 4x4 '77 Blazer with 350ci,TH350 tranny, 3.73 gears, and factory towing suspension package? I know there must be a figure but I can't find it.
     
  2. JeremyK5

    JeremyK5 1/2 ton status Premium Member

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    It depends. A few questions first- Do you have an aux. transmission cooler? Also what type of trailer is it? (flat bed, boat, horse trailer, etc.) Does it (your truck)have a weight distributing hitch? The weight you can safely tow can be changed a lot depending on your answers to these questions.
     
  3. bergst

    bergst Newbie

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    The trailer is a 24ft camp trailer. My Blazer does have a tranny cooler and I have been using a load equilizing hitch setup for the smaller trailer. Need any more info? The rig has been running like a top, strong engine and tranny, but getting to be high mileage.
     
  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I've been towing with my K5 for quite a while. I also do tons of towing with light duty trucks at work. I wouldn't recommend towing more than 5500 lbs, and only if you have the following:

    1. A good quality weight distribution setup. A short wheelbase vehicle can allow trailer sway to overtake the tow rig. An anti-sway/weight distribution hitch all but eliminates the problem. I use Reese products.

    2. A good quality brake controller. The Tekonsha Voyager is an awesome product for dual axle trailers. I personally woudn't go with any other make.

    3. A stacked-plate auxilliary tranny cooler. My K5 is equipped with a 700r4, and an aux. cooler is a must. I'm not sure how important it is to use an aux. cooler with a 3 speed, but I can guarantee it wouldn't hurt.

    Whatever you do, I recommend avoiding a heavy single-axle trailer. They have a tendancy to sway at higher speeds and can cause handling/stopping problems for a Blazer.

    Welcome to CK5, brother!!! /forums/images/graemlins/thumb.gif
     
  5. JeremyK5

    JeremyK5 1/2 ton status Premium Member

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    That would put the trailer at 5-6 thousand pounds? I think your Blazer would pull it ok, but I would make sure it had high quality brake pads and definitely get a sway control bar!!!
    The main thing you need to worry about is with a longer trailer, if you get a gust of wind from the side, it can jerk the rear of the truck sideways because of the short wheelbase. I have a similar Blazer, and the only time I had a problem towing a larger trailer was when the wind started my trailer swaying, and then it yanked the rear of my Blazer back and forth about 2 feet each way- /forums/images/graemlins/blush.gif I had to make the rest of the trip at 40mph or slower. I probably won't be pulling that trailer again until I get sway control for it and my Blazer.
     
  6. bergst

    bergst Newbie

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    So you're saying that I can get away with towing the larger trailer. I forgot to mention that my rig does have a brake equalizer installed. The towing distance is about 200 miles over the South Pass of the Wind River Mtns.
     
  7. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Basically, if your trailer is a dual axle and weighs no more than 5500 lbs FULLY LOADED(add the weight of all your gear- food, clothing, etc...- to the dry weight of your trailer), I would say you'll be okay.

    I can't stress the importance of a good quality and properly adjusted brake controller and a heavy duty weight distribution setup. If you feel that your equipment is beefy enough to handle a heavy trailer, the go for it.

    I also assume you know that towing a heavy trailer requires you to drive safely and take your time. Speed is the #1 cause of towing accidents. I would also recommend you purchase a set of towing mirrors if the side mirrors on your truck don't allow you a good view of traffic behind you. If you can't see beyond your trailer, you're setting yourself up for trouble. CIPA makes a good slip-on towing mirror for about $30 a side......

    Good luck, brother!!!!! /forums/images/graemlins/smile.gif
     
  8. dremu

    dremu Officious Thread Derailer Premium Member

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    Other folks have eloquently stated the need for proper respect for your towed load, a trailer brake, and a tranny cooler. I won't repeat the same advice, excpet BUY A TRANNY COOLER.

    OK, there /forums/images/graemlins/smile.gif

    Now, if you look the Brochures page and go to 1977, Chevy says the GCWR (combined weight of kerb weight, people & stuff inside, gas, and trailer) is 9500# for the 3.73 axle with a 350.

    Assuming the kerb weight of your truck is ~5000# (this is a guess and can vary tremendously -- do a search on it!) this gives you about 4500# for your trailer.

    With the TH350 you can stretch those numbers some; with a 700R4 you'd be in trouble, generally. Do watch the tail-wagging-the-dog effect with long trailers and short wheelbase tow vehicles, and if unsure, slow down /forums/images/graemlins/smile.gif

    -- A
     

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