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Thread: Gear change

  1. #1
    Join Date
    Mar 2007
    Location
    Devils Lake, ND
    Posts
    363

    Default Gear change

    Got out of the business I was in and my '95 3500
    dually is losing the ladder racks and boxes....

    In the future it will only be towing a 26' travel trailer
    and my bobcat occasionally.

    I have 4.10 gears now and the MPG is not what I'd like.
    I've read on here that the 3.73's would still do some towing
    and get my MPG up.

    So I need 2 sets of ring and pinion gears?? How tough to
    change out? Anyone have part numbers and specs so I
    can run them down? (hopefully good used)

    If Gear Vendor or US Gear systems weren't so spendy
    I'd consider them.

    Thanks
    1995 Chevy 3500 6.5 TD
    *Heath 80 HP chip
    *Warp Speed 4" Exhaust
    *Bully Dog Pillar gauges
    *Cooling Fan Upgrade
    *Air Cleaner Upgrade
    *Turbo Master


    1995 GMC 3500HD 6.5 TD 16 foot Flatbed
    *NV4500 Trany Recent Rebuild
    *Glow Plug Upgrade
    *4" Heartthrob Exhaust w/no muffler (turbo back)

    1981 VW PickUp (Caddy) (48 MPG)
    *Drop in Turbo D engine
    *15 gallon tank
    *81,000 original miles on body

    1986 VW Jetta Turbo D (42 MPG)
    *Rebuilt Trany
    *190,000 with one family

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,806

    Default

    My Chev has 4.27 diff, and when it had low miles, it got 20 mpg and the suburban with 3.73 diff gets 17 mpg, so I wouldn't change ratios.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Mar 2007
    Location
    Devils Lake, ND
    Posts
    363

    Default

    I read that it was best to keep the engine in the
    1600 to 1800 RPM zone for best MPG. The 4.10's
    won't let me do that unless I like 55 to 60 all day
    long.

    So running taller tires???
    1995 Chevy 3500 6.5 TD
    *Heath 80 HP chip
    *Warp Speed 4" Exhaust
    *Bully Dog Pillar gauges
    *Cooling Fan Upgrade
    *Air Cleaner Upgrade
    *Turbo Master


    1995 GMC 3500HD 6.5 TD 16 foot Flatbed
    *NV4500 Trany Recent Rebuild
    *Glow Plug Upgrade
    *4" Heartthrob Exhaust w/no muffler (turbo back)

    1981 VW PickUp (Caddy) (48 MPG)
    *Drop in Turbo D engine
    *15 gallon tank
    *81,000 original miles on body

    1986 VW Jetta Turbo D (42 MPG)
    *Rebuilt Trany
    *190,000 with one family

  4. #4
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,806

    Default

    If you want to experiment, the taller tires are the cheap way to go.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  5. #5
    Join Date
    Dec 2006
    Location
    Cape Cod, MA
    Posts
    477

    Default gear venders

    Go for the Gear Venders unit. I have it in my 2000 K3500 SRW and I LOVE IT !!
    4.10s 235/85-16 rubber 1800rpm at72 mph in double OD.
    Doug Martin - Cape Cod, MA

    2000 K3500 SRW 6.5TD, FSD Heat Sync, 80hp ssd-computer, 4" aluminized exhaust,ssd Marine Injectors, ssd induction kit, Isspro Gauges, Gear Venders under/overdrive unit

    1999 K1500 Suburban 6.5TD, FSD Cooler, 40hp BD Computer, ssd Fuel-miser injectors, ssd induction kit, Isspro Gauges

    1991 V1500 Suburban 6.2TD, Banks Sidewinder turbo package, 6.5TD heads, 6.5TD injectors (It thinks its a 6.5 Turbo Diesel)

  6. #6
    Join Date
    Mar 2007
    Location
    Devils Lake, ND
    Posts
    363

    Default

    GEar Vendor is spendy for sure.

    What kind of MPG you pull at 70 in double OD?
    1995 Chevy 3500 6.5 TD
    *Heath 80 HP chip
    *Warp Speed 4" Exhaust
    *Bully Dog Pillar gauges
    *Cooling Fan Upgrade
    *Air Cleaner Upgrade
    *Turbo Master


    1995 GMC 3500HD 6.5 TD 16 foot Flatbed
    *NV4500 Trany Recent Rebuild
    *Glow Plug Upgrade
    *4" Heartthrob Exhaust w/no muffler (turbo back)

    1981 VW PickUp (Caddy) (48 MPG)
    *Drop in Turbo D engine
    *15 gallon tank
    *81,000 original miles on body

    1986 VW Jetta Turbo D (42 MPG)
    *Rebuilt Trany
    *190,000 with one family

  7. #7
    Join Date
    Mar 2008
    Location
    Fremont, Ohio
    Posts
    126

    Default

    i put taller tires on mine and my mileage went up a bit. I had 31" tires on. i get about 22 mpg on the highway
    1997 GMC 1-ton Dually 4x4 crew cab, 4.10 gears, homemade mechanical boost controller, 2.5" crossover pipe, 3" downpipe, 4" exhaust, 19 mpg thanks to the propane injection kit, Remote PMD, marine injectors, instant heat glow plugs and just turned 141,000 miles

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