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  1. J

    Brownies? Aux trannies? Dual transfer cases? 2 speed axles?

    US Gear dual range / Doug Nash DNE2 box. In your application get an OD box (0.8:1) gives you the equivalent of a 3.28 rear in OD, or could regear to 3.55 and use an underdrive box to get the equivalent of a 4.43 rear in low. Shifts like a 2 speed rear on either a pushbutton or push/pull...
  2. J

    Doug Nash Ford C-6 Dual Range Underdrive

    Looks like someone fitted a later style motor and US Gear control unit. Price seems high for an under-drive.
  3. J

    Service manual recommendations

    The Haynes manuals are decent (or at least the 2000 era editions I have, no idea if it's changed or not). You need both the F series manual and the diesel engine manual. Diesel engine manual is basically lifted directly from factory, though arranged weirdly. Best is factory manual.
  4. J

    7.3 idi compression test numbers and discussion

    It's ok, don't stress about it. Compression test is never really about absolute pressure, it's about differences because there's so many variables. #6 is the only one that's really out of family. Book spec is within 75% of max, i.e. with 440 max, 330 should be minimum, so it's low out of spec...
  5. J

    need a fan clutch

    What fan clutch bearing? Do you mean the water pump? That's the closest bearing I can think of. Elimination of the water pump would be disrecommended, but YMMV. Also note that the fan is actually more critical when idleing than during most driving conditions, especially if running AC or any...
  6. J

    need a fan clutch

    You can fix 95% of fan clutch problems by adding more oil for a net cost of about $5. https://www.oilburners.net/threads/the-4-fan-clutch-fix.64852/ Or the real answer is to put an electromagnetic clutch on it - Horton 996127. Seems like to be $800+ though if you can find one.
  7. J

    Difference between rtoo 9513 11613 14613

    The first part is rated input torque - 950, 1150, 1450 ft/lb, so size, weight and toughness likely scales accordingly. As long as you're running within rated specs I wouldn't think heat would be an issue for any. Noise is probably more a function of condition than specific model. No idea on...
  8. J

    US Gear Dual Range / Doug Nash Info

    Check back through this thread - I posted a bunch of part numbers but can't recall if I had seal PNs or not. If not, measure ID, OD & thickness and do some research - I'm sure there's an oil seal out there which will fit.
  9. J

    US Gear Dual Range / Doug Nash Info

    Shouldn't get too hot - mine I think would get up to about 250* oil temp, and that's on a 4wd with the t-case blocking almost all airflow over it. Having the exhaust right next to it is going to cause problems though. Definitely need a metal cap, pretty sure plastic would melt. Hardening type...
  10. J

    US Gear Dual Range / Doug Nash Info

    My approach would probably be to machine a 'top hat' that would go over the OD of that and mate with the flat surface of the plate and either weld to or have screw to hold it to the plate. Probably could find a plastic cap or similiar that would do the same and not require machining. Find...
  11. J

    Just a random thought: IP electrical connectors

    A bad connection on the fuel shutoff could certain cause a problem. The smaller of the 2 connections is cold advance and only energized when cold/woln't make much difference if it's corroded, but the larger will shut off fuel if the solenoid doesn't get a minimum voltage.
  12. J

    Oil Pressure port

    Can also use the port on the driver's rear where the turbo oil feed commonly hooks up to.
  13. J

    WTB - Doug Nash DNE2 / US Gear Underdrive

    Specifically looking for an *under*drive. Needs to be Ford spline count. Don't need the adapter, control or any of that (though will take it if available), and doesn't need to be in great shape as long as it's not blown up. I've got a idi dump truck for around the farm use and the 4.10/T-19...
  14. J

    6.9 idi cylinder wall pitted

    Yes, it need to be bored. Very unlikely it will clean up at 0.010, probably need at least 0.020 and maybe more. A 0.010 bore is difficult to do even just with normal wear, and those pits are at least 0.005" deep. Check the oil squirters and see if they're press in or bolt in. They will have to...
  15. J

    Compression reduced pistons

    OE reduced CR pistons seem hard to find. Easiest thing to do is get standard pistons and have them decked. When I did mine I went 0.015" and then had them ceramic coated. IIRC that reduced the CR about 1.5 points. (~20.5 IIRC?) Still started and ran just fine there. I'd be cautious about taking...
  16. J

    Getting by with one battery in summer?

    Shouldn't be a problem with 1 battery, but I'd be concerned about making sure the driver's side terminal is adequately secured/insulated from shorting out without it being connected to a battery.
  17. J

    Hydraulic Winch setup info needed.

    Ps pump is about 1 gpm, and makes for winching that could be outrun by a lethargic slug.
  18. J

    Hydraulic Winch setup info needed.

    I think someone is giving you bad info. Here's what I got back when I asked about max specs: Max for our winches are, 103.4 Bar (1500 PSI) on all winches. 15.9 liters per minute (4.2 GPM) on the 9000lbs and 10500lbs winches using our valve. 37.85 liters per minute (10 GPM) on the 9000lbs and...
  19. J

    Bonded or riveted brake shoes?

    Quality is far more important than how it's attached. Crappy riveted lining can be just as useless as crappy bonded, and a well made bonded shoe will work just as well.
  20. J

    Hydraulic Winch setup info needed.

    I have a 12k milemarker, and while slow it seems to work well. Mine is plumbed to run off the powersteering pump, which is why it's so slow. I would not expect to need anything over about 10 GPM for a typical winch - 30 is quite excessive IMHO. A 30 gpm pump would be quite large, as would the...
  21. J

    Air-water CAC/intercooler on an IDI?

    Most of the stock aftercoolers do use a similar system, with the cooling system then sized to accommodate the added heat load. Downside is you're not cooling air below coolant temps, on the flip side it's simpler and more space efficient than air to air. The air to water uses a fully separate...
  22. J

    Air-water CAC/intercooler on an IDI?

    The air/water intercooler is a separate radiator, so no direction additional load on the cooling system. Admittedly you're limited by the same amount of air flowing through the radiator/cooler stack on the front of the truck, but you have the same thing with an air to air cooler. Air/water could...
  23. J

    Air-water CAC/intercooler on an IDI?

    I like it. Seems to spool up well and easily gets to 15-20 psi. Not sure if it would go higher with wastegate adjustment or not (set as the stock cummins setting, which IIRC is about 18 psi). My setup is a fully custom mount/piping and while it fits well there, I think you'd have clearance...
  24. J

    Air-water CAC/intercooler on an IDI?

    Did it on mine. HX35, running up to about 20 lb boost. Never put any instruments on it to see how effective it was, but seemed to work out ok. Biggest thing I found is that it was difficult to keep the system full of coolant, I think because there was no expansion volume and no vent off the...
  25. J

    "demountable" hubs vs standard 8 lug on Trailer

    MH axles aren't single use, they're just designed for lower speed/less use than a standard trailer axle. Bearings/seals are off the shelf parts, though as mentioned it's an odd spindle. Also any number of different manufacturers over the years some with various different configurations but they...

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