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Trailer towing q's

Discussion in '6.9L IH & 7.3L IDI Diesels' started by chris142, Jul 28, 2020.

  1. Greenie

    Greenie Registered User

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    I've been out west (Yellowstone, Utah, Arizona) 3 times and way into Mexico 6 times - crossing the Sierra Madre west of Durango towing a 7,000 lb travel trailer. Steep hills slowed it down but those grades also slowed OTR trucks down too. I would try to keep the speed up 75-80mph most of the time - the faster entry speed helped get up steep grades a little better. MPG was never better than 11 or 12. I bought this truck new in 1993 and still have it 277K miles later. No turbo, 4.11 axle, E4OD transmission (rebuilt at 220K miles)
     
  2. u2slow

    u2slow bilge rat

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    I'm unclear if you mean you can't upgrade the truck or replace the truck.

    I think a set of 4.10 gears (used diffs) are your most affordable improvement.
     
  3. chris142

    chris142 Full Access Member

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    Both! I was reciently informed that I will be jobless by November. I am not spending money on anything I do not have to have. I was informed of my future the morning after we bought the trailer. We are super busy,making great income so I had no idea this was coming.
     
  4. u2slow

    u2slow bilge rat

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    Ouch! Sorry to hear. :(
     
  5. G. Mann

    G. Mann Full Access Member

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    Question:
    What is your rear end gear ratio?
    It may be to tall to tow a heavy rig... That would make take off a real struggle... like you describe having to use low range to launch....
     
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  6. chris142

    chris142 Full Access Member

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    3.55. But we have some very steep hills here I had to stop on. Same hills that require granny low in a semi. I know 4.10 would pull better but would also limit my hwy speed tremendesly.

    I have an appt for Tuesday to get my trailer wiring figured out so that I will have brakes. Then I can go across town(30 stop lights!) And get the thing weighed at the truckstop.
     
  7. chris142

    chris142 Full Access Member

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    It will take off from a light on flat ground in 2wd. Just takes a super long time to get up to speed.
     
  8. Greenie

    Greenie Registered User

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    One of the biggest favors a person can do with an automatic transmission is to put the transfer case in 4 Low (hubs unlocked) when backing into a campsite. Reverse seems to be geared higher than drive starting from a stop - plus there's no air passing through the coolers to cool the ATF.
     
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  9. lsaami

    lsaami Full Access Member

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    Look into the hyper max cowl intake kit I have that on my 7.3 motorhome and it seems to do the job nicely.

    https://www.gohypermax.com/ProductDisplay.aspx?ID=af8d1cca-4409-4340-ae41-09ffbab329ac

    it’s interesting that you guys are having problems with power. My motorhome with a stock 7.3 with a first gen banks and an air intake will pull itself and a 4,000lb trailer full of four wheelers up hills without downshifting out of overdrive. Now that’s in MN, so it’s certainly not the Rockies, but it would do it just fine.
     
    Last edited: Aug 2, 2020
  10. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    It's also easier on the clutch in a manual if you do this. IIRC, my truck with a ZF5 and 3.55 gears will go 7 MPH in reverse at an idle. I'm NOT going to try to back up a trailer at that speed.
     
  11. chris142

    chris142 Full Access Member

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    Ya I always back my little trailer in 2lo. Truck is a stickshift T-19
     
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  12. Clb

    Clb Another old truck Supporting Member

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    I doubt 4:10's are a limitation on towing\top end...
    I've towed 6-7k to Alaska and hit 80+ in yokon\b.c. Easy.
    Never had an idi with 3.55:1
     
  13. Clb

    Clb Another old truck Supporting Member

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    Now put a pin in life, figure out the future.
    Deal with the job first.
     
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  14. Grange Bond

    Grange Bond Registered User

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  15. Grange Bond

    Grange Bond Registered User

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