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How much weight can I tow?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by woodpecker, Apr 1, 2001.

  1. woodpecker

    woodpecker Registered Member

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    Alright,

    I thought myself lucky that my '86 K5 still had the original owner's manual and documentation. But I'm not sure what the purpose of these documents was. They tell you great things like, don't try to drive it upside down. When going down really really long and steep hills, try putting the tranny in 2 or 1 instead of OD. Great, but if you want to know something more specific, you're screwed.

    I've got an '86, 305, th700r4, with 3.73 diffs. All stock. Hey I'm poor. I'm looking at buying a trailor, but am in the dark as to how much weight I can pull. The TRAILOR books suggested that the GM 305 can pull 6500lbs. Is this about right?

    Thanks!
    Woodpecker
     
  2. timebomb1602

    timebomb1602 1/2 ton status

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    I'd say a safe bet would be 5500 to 6000 max. Usually trailer tow weights that the maker lists are how high they went before stuff started to brake..

    1991 GMC Jimmy, 350 tbi, stock for now, but not for long!!!
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well I tow a 21 foot Camper trailer that weighs about 5500 lbs with our junk in it. My Jimmy has a mild 350, 4 speed standard, 3.73's and at the time 35" General Grabber MT's. I never had any problems...
    I'd recommend a weight distributing hitch though.

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I wouldn't recommend towing more than 5000 lbs(trailer and gear combined) with a 305. And make sure you install a heavy-duty auxilliary transmission cooler or you'll burn up your 700r4 in no time. I run a 22,000 GVW cooler on mine.

    One other thing- NEVER tow in overdrive.........


    <font color=red>PHOTO ALBUM-</font color=red> <A target="_blank" HREF=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</A>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  5. Bone85K5

    Bone85K5 1/2 ton status

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    and.....always tow in drive not overdrive. My mech who has built many of trannys for us (2 subs and 2 k5s) stands by this. laways tow in drive and stuck around 55-65mph. Of course a cooler also. (tranny cooler guys)

    Ben
    www.BenjaminBone.coloradoK5.com
     
  6. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Like I said....................?



    <font color=red>PHOTO ALBUM-</font color=red> <A target="_blank" HREF=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</A>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  7. HarryH3

    HarryH3 1 ton status Author

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    Also keep in mind that tow ratings usually are rated for someplace like Florida. Flat roads at sea level. Add altitude and mountains into the mix and things start changing really fast. [​IMG] Since you live in Washington, you'll need to think about where you'll be towing. Hauling a 6,000 lb trailer across the Cascades would be a long, slow trip (at least on the uphill side!). [​IMG]

    At least you have decent axle gears. 3.73's were what came in the axles automatically when you ordered the tow package. Install the biggest tranny cooler you can find and indeed, keep the trans OUT of overdrive while you're towing.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  8. jarheadk5

    jarheadk5 1/2 ton status

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    Sure you can tow it, but can you STOP IT?? Make sure the trailer has good brakes and your K5 has good brakes too. Don't be afraid to downshift the trans to use engine braking...Oh wait, you already mentioned that.

    [​IMG] Semper Maintenance!
     

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