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towing

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Innerpiece, May 31, 2001.

  1. Innerpiece

    Innerpiece 1/2 ton status

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    hi all --

    87 k5 silverado blazer, tbi 305, 700r4, np208, 32"x10.5, 10 bolt, 3.11 (i think) gears. 150k miles

    I've recently acquired a boat that I've been lugging around with the rig. I already know not to tow in O/D, and everything seems to be working out really well so far. The only thing that I've noticed is that I seem to be loosing somehting in the drivetrain when I'm goin up an icline at a relatively slow speed. now I know it's not gunna race up the hill with almost 6000' of boat behind it, and I dont have a tach, but it seems to be getting up above the middle of my normal rpm range just to hold speed going up a hill.

    for example, crossing a bridge on the coast with the hump in it for boats to go under. around 15-25 mph it really takes a lot of gas to keep moving and a whole lot if i need to accelerate. there are no signs of tranny wear or overheat in the fluid, although my pesky oil leak gets a little worse while pulling.

    I'm not overly concerned, I was just wondering if this is a sign of anything (old torque converter, tranny old, etc.) any thoughts?
     
  2. Emmettology 101

    Emmettology 101 3/4 ton status

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    305's aren't known for towing power and with a 150K isn't helping.

    BUt you typed: "6000' of boat." DAMN!!! That is one big boat!!!!!!!!! LOL

    Does the trailer have brakes? Are they sticking a little? If you meant 6000#'s, then that is a decent amount ot tow and you are goign to notice it.



    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
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  3. Innerpiece

    Innerpiece 1/2 ton status

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    feet, pounds, eh whatever .... 6000 pounds baby pounds.

    The trailer has brakes but they are (unfortunately) throughly disabled so i know they aren't dragging, but they also don't help me stop at all ... that's over 12000 pounds of rig rolling over a rice rocket (do you think I'd even notice).

    It's not really a big boat (20') but it's really well made and heavy ... the boats got a 350 with a quadra-jet on it ... (grand schemes of engine swapping)

    but I shoudn't worry that my tranny's about to [censored] the bed?
     
  4. Emmettology 101

    Emmettology 101 3/4 ton status

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    :)

    What brand of boat? My father has a 1985 Checkmate. It is 20ft. also but has a 200HP 305... I keep trying ot get him to sell it and by a 24ft Checkmate with a 502, but he hasn't given in yet.

    With somethign that size, I would definately say that there probably isn't anything majorly wrong. You are towing a decent sized load and with a 305, it is workin hard to get it moving.....

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
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  5. newyorkin

    newyorkin 1 ton status

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    Emmettology's rigt that's a lot of wieght to be draggin around, and a 305 may just be workin' too hard to do it...
    Have you tried manually shifting from 1st to 2nd, then eventually to D? I've only done that while flat towing heavier vehicles, or when I'm about to blow a tranny, but I've noticed It seems to make the load feel lighter, controlling the shifts.
    Also, stick a tranny cooler on it. It's possible your tranny's getting too hot and under-performing without burning up the fluid. They're cheap and super easy to install, you just tap into a cooling line at the radiator and route some fuel line-grade hose to the cooler then back to the radiator.

    Good luck with it?

    Ratch
    **<A target="_blank" HREF=http://k5.8m.com>http://k5.8m.com</A> What more is there to life?**
     
  6. Innerpiece

    Innerpiece 1/2 ton status

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    yeah = I've got an external cooler on the tranny in front of the radiator ... about 1 1/3 the size of the heater core ... I think its original b/c I have the "towing" package...

    btw ... 1994 chaparral 20'6" cuddy cabin with a 350 mercruiser with a weber quadra jet (260 horse) that purrrrrrs ... bought it 3 weeks ago with 65 original hours on it for 10 grand. now if I only had a/c in the truck ..
     
  7. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    6000 lbs is a BIG load for a Blazer, let alone a 305!!!!! I'd look closer at your gearing- you say you have 3.11 gears. First of all, I've never heard of 3.11s. You might have 3.08s or 3.42s, but for a load like your boat you should probably using 3.73s - they'll keep your RPMs up higher so you can maintain speed uphill.

    If you can find your GM codes somewhere on the truck(glove box or inside the engine bay), look for a code that starts with GT or GU- This will tell you what gears came factory in your truck(assuming that someone hasn't changed them). Post the code and I can tell you what gears you have..........



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  8. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    I would agree, there is probably nothing wrong. 305's are not known for their massive low end torque. 12,000 pounds is a lot to move up a hill.

    My .02,
    John

    '83 GMC Jimmy 4x4 ZZ4 Crate Motor
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