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  1. 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...
  2. 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.
  3. 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.
  4. 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.
  5. 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...
  6. 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
  7. oldbrown

    GMT Helping Each Other

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

    91 K1500 350 TBI Running Rough

    Hi guys, I recently picked up this truck with 163k miles. Guy was a straight shooter and it was his backup truck. Drove it today for a few hours running errands etc. Ran like a champ. Took it back out in later in the day and it is running rough, no power and will hardly stay running. My...
  9. oldbrown

    GMT400 Fan

    Good morning all. I have strayed a few times but I always come back to these trucks. People think I’m crazy for getting older vehicles but I like having something that I can fix. I still have the crew cab and recently got the standard cab 4wd. The brown and blue ones I have sold (should have...

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