Gear Venders over/under drive on HO!

[brobeson]

Has anyone used the Gear Venders over/under drive on an HO/6speed? Or other cummins.

What gears are you running, 4. 10 or 3. 55?

What RPM are you running empty at 70 or 75 MPH.

With my 4. 10s I am running 2000 RPM at 70 MPH and 2450 RPM at 75 MPH.

While I do not run emply often, I feel it would be nice to slow the engine down some at normal freeway speeds.

TIA

Bob


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2001 3500, SLT+, Green, Tan leather, Duel Power Seats, HO, 6 speed, 4X6, 4. 10, Towing Package, Trailer Tow Mirrors, Camper Package, Sliding rear Window, Jacob’s E-brakes (Dodge), Electric Steps (Dodge), Clarion overhead TC/VCR, In motion satalite, Mud Flaps on all 4s (Dodge) Line-X over the rail bed liner, 20K Reese 5th wheel Hitch with Gooseneck, 30” toolbox and tailgate box. Factory ordered, Picked up on 5-15-01. WOW!

Also have a 1998. 5, 2500, SLT, Red over Driftwood, 24V, 4X4, Auto, 4. 10, Light Group, Camper Special group, Convenience Group, Travel Group, Trailer Group, Keyless entry, 5 band EQ and 6 disk changer, 15K lil' rocker 5er hitch, tool box, rail guards, fog/driving lights, wood grain dash. (truck is 4-Sale)

 

[jasond]

Just a question... My 01 4x4 with the six speed and 3. 55's runs 70 at exactly 2000... 75 at 2125... I wouldn't think the 3. 55 and 4. 10 would be the same at 70... . ?

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Mine... 2001 3500QC 4WD ETH/DEE, everything but leather, straight pipe all the way... Her's... 2001 2500QC 4WD, everything AND leather

 

[Big-D]

brobeson,

You need to check your rpm's again. I find it hard to believe you are turning 450 more rpm's for a five mph gain.

 

[RobG]

I have a US Gear Overdrive on my 2001 3500 ETH/DEE with factory 4. 10's. Mine's set as an overdrive (of course), so I can run 75 mph at 2000 RPM (approx).

However, I have noticed absolutely NO MPG improvement with the overdrive. It is useful for split shifting on hills and stuff, but to be honest, when I'm towing, I rarely use any of the OD gears. I generally run 60-65 mph in 6th, keeping the rpms at 2000-2200.

Rob


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2001. 5 RAM 3500 QC 4x4 ETH/DEE Silver/Agate, 4. 10, USGear OD, Rickson 19. 5 Wheels, DD EZ, DD3 Injectors, HX-40, Southbend Clutch, SPA Guages, Psychotty, Firestone Airbags, Hellwig Rear Swaybar, Torklift Superhitch & Camper Tiedowns, Mag-Hytec Diff Cover, DD 4" Exhaust, US Gear Exhaust Brake, etc.

 

[brobeson]

RobG.

So let me get this straight as this is exatcly the information I was looking for.

Stock we do about 2500 RPM in 6th at 75 MPH.

With your overdrive you are doing about 2000 RPM in 6th at 75. A 500 RPM drop.

And running empty you see no differance in MPG.

TIA

Bob

 

[RobG]

Bob:

Yup, that sounds about right. The US Gear is a 20% overdrive, so 500 RPM is about right in 6th. I have 19. 5" tires, so the actual RPMs may be off by 200 RPM or so, but the drop is around 500 RPM.

Mileage... I saw ZERO difference between running with it engaged or disengaged. The whole reason I bought the **** thing was to try to improve the pathetic mileage this POS truck has gotten since the day I bought it.

My overall mileage has gone up a bit, but it's still NOWHERE near what most people are reporting (high teens). My best unloaded has been 14. 5 mpg. My best towing as 12, but it hovers between 10-11 most of the time (loaded -- 19k GCWR).

To be honest, I wish I'd kept my '96 and just rebuilt the automatic in it.

Rob


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2001. 5 RAM 3500 QC 4x4 ETH/DEE Silver/Agate, 4. 10, USGear OD, Rickson 19. 5 Wheels, DD EZ, DD3 Injectors, HX-40, Southbend Clutch, SPA Guages, Psychotty, Firestone Airbags, Hellwig Rear Swaybar, Torklift Superhitch & Camper Tiedowns, Mag-Hytec Diff Cover, DD 4" Exhaust, US Gear Exhaust Brake, etc.

 

[brobeson]

My first tank of fuel I went 388 mile on 25 gal of fuel for a little over 15 MPG, then I went on a 1300 mile trip with our 5er at a CGVWR of 20400#. I got 9 MPG. I have gottin a little over 16 MPG (285 miles on 17 gals of fuel= 16. 7 MPG)on my last tank with out the trailer. I still have less than 2000 miles on the truck. 100% stock.

Bob

 

[brobeson]

Opps

Make that 2300 at 70 and 2450 at 75.

I would like to get down under 2000 at 75.

Thanks

Bob