Recent content by oldbrown

  1. oldbrown

    K3500 Gearing

    So has anyone run 235-85-16 on their K3500 dually in place of 225-75-16 without any modifications with no issues? Gets me real close to 4.10 ratio. Thanks
  2. oldbrown

    K3500 Gearing

    Thanks guys for the feedback. I see the pros-cons for both the 3.73 and 4.10. So towing with 4.56 is just under 8mpg. Same with 25 foot RV or 16 foot open trailer. Speed is at 63 mph/2500 rpm. I never expected good mpg but at under 8 it limits how far you can drive without stopping. It...
  3. oldbrown

    K3500 Gearing

    Thanks guys. I was planning on just swapping front/rear axles from parts yard. My truck did come with 4.10 based on glovebox code. I appreciate all the feedback.
  4. oldbrown

    K3500 Gearing

    So we bought our 98 K3500 crew cab 454 dually to haul a camper. We ended getting a relatively small camper (25 ft, 4500 lbs empty). Just my luck someone swapped the 4.10 gears for 4.56 gears. Obviously overkill and poor mpg/high cruising rpm has limited its use to just hauling. I have finally...
  5. oldbrown

    K3500 and K2500 Front Differentials

    Correct, I stated 8 lug in my initial note. I would think all 8 lugs are the same but the factories do some weird stuff. Thanks
  6. oldbrown

    K3500 and K2500 Front Differentials

    Thanks. Do you know from experience? Not doubting but just want to know for sure before tearing apart. Yes, I will make sure ratio is correct
  7. oldbrown

    K3500 and K2500 Front Differentials

    Good morning. I have 98 K3500 dually and looking to replace the front differential. I am finding a lot of 8 lug K2500 differentials. Do the K3500 dually and HD K2500 use the same front differential? Thank you.
  8. oldbrown

    Luke Warm Heat

    Thanks guys I plan to look at the blend door
  9. oldbrown

    Luke Warm Heat

    Have a 91 K1500. Truck gets up to temperature but heat is only about 105 out of the vents. I flushed the heater core and put in a new thermostat with no real changes. Only other thing I can think of is the coolant is not circulating well. No noises or leaks from water pump. Any ideas? Thanks.
  10. oldbrown

    Supercharged Towing

    Has anyone done any towingwith a supercharger on their 350 TBI? I am within trucks towing specs but looking for a little more oomph. I know the Whipple is ideal but no longer available. Anyone running a procharger? Or another brand? Thanks.
  11. oldbrown

    Cruising RPM

    Thanks guys. The 4.56 ratio did come into my mind as well. I think I will physically check the rear end to confirm.
  12. oldbrown

    Cruising RPM

    Good morning. I am curious what RPMS you guys are seeing with vortec 454, and automatic with OD in crew cab dually. Based on GM code, I have 4.10 gears. I have original tire size. My speedo is definitely off. At 2500 RPM in OD it says 70mph but GPS says 63. The 4 variables are gear ratio...
  13. oldbrown

    1998 K3500 GCWR

    Awesome, thank you! I will be about 14.5k, good to go
  14. oldbrown

    1998 K3500 GCWR

    Good morning guys. I have not had any luck finding GCWR for 98 K3500 crew cab 454 dually with 4.10 gears and automatic. Can anyone provide actual numbers or link that shows this? I doubt I will be anywhere near but just want piece of mind. Thanks
  15. oldbrown

    GMT Helping Each Other

    The Silver Bullet being transported by The Beast for some TLC.
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