Eco diesel re gear

[CrazyCooter]

I vote for 4.10's!

I towed all over the west coast and south west on 37's and 3.73's for 30K miles felt it was almost perfect. 4.10's was too big of a jump for me on 37's.........so when I decided to go up to 38's, the 4.10s would be the perfect balance.

Last year we did a 5400 mile trip through serious mountain country loaded right at 12K + or - depending and still stand by my decision.

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[Rusty PW]

4.30's. But that's vaporware.

 

[CrazyCooter]

4.30's. But that's vaporware.

4.30's would have been a 16% change and way too much in my opinion despite me traveling loaded 5-12% grades all the time. I was looking for 6% to put my gear spacing perfect for towing and unloaded. the 38's and 4.10's got me as close as possible.

I drove on the 37's and 4.10's for about 5k miles unloaded and hated it, but my 38's were on a pallet at the shop just waiting..........

 

[Rusty PW]

4.30's would have been a 16% change and way too much in my opinion despite me traveling loaded 5-12% grades all the time. I was looking for 6% to put my gear spacing perfect for towing and unloaded. the 38's and 4.10's got me as close as possible.

I drove on the 37's and 4.10's for about 5k miles unloaded and hated it, but my 38's were on a pallet at the shop just waiting..........

I live in a river valley. Where everything is either straight up or straight down most of the time. Mountains are a half hour away.

 

[CrazyCooter]

I live in a river valley. Where everything is either straight up or straight down most of the time. Mountains are a half hour away.

I live at the north end of a valley......it's 5% grade North, 8% West, and 9% East, but not to hilly in town. South heads into the cesspool, so I only go uphill!

 

[Ericshere03]

I vote for 4.10's!

I towed all over the west coast and south west on 37's and 3.73's for 30K miles felt it was almost perfect. 4.10's was too big of a jump for me on 37's.........so when I decided to go up to 38's, the 4.10s would be the perfect balance.

Last year we did a 5400 mile trip through serious mountain country loaded right at 12K + or - depending and still stand by my decision.

I agree, I put 37” on my last gladiator diesel, thought it was perfect … gearing was perfect. Power was great and MPG hovered around 22-27mpg, stock overland street tires was 27-31mpg.

I think the transmission is so versatile that going 4.56 would be nice and peppy and the double OD gears will just knock the RPMs down. But at what cost MPG wise.

 

[Jefe1018]

I agree, I put 37” on my last gladiator diesel, thought it was perfect … gearing was perfect. Power was great and MPG hovered around 22-27mpg, stock overland street tires was 27-31mpg.

I think the transmission is so versatile that going 4.56 would be nice and peppy and the double OD gears will just knock the RPMs down. But at what cost MPG wise.

At 75 you’d probably be like 23-2400 RPM. I know with 3.73 at 75 I’m like 1600.

 

[Ericshere03]

Well when the same engine stock for stock equipped in both yields 15-20% better mpg in the ram and swapping to 37s on the 3.73 drops mpg by 15-25% alone I think it's pretty solid speculation backed up by everybody's experience who's lifted and/or regeared a Jeep ever, and common sense, but ok.

Well, comparing stock for stock, my last gladiator got equal or greater to what the ram folks are reporting. It was an 80th anniversary, basically a sport in overland clothes …

my current rubicon struggles to get 25mpg highway whereas the 80th would get as good as 31mpg. When I lifted and put 37” KO2s on the 80th is dropped to about 27. This is best case highway MPG.

 

[Jefe1018]

Well, comparing stock for stock, my last gladiator got equal or greater to what the ram folks are reporting. It was an 80th anniversary, basically a sport in overland clothes …

my current rubicon struggles to get 25mpg highway whereas the 80th would get as good as 31mpg. When I lifted and put 37” KO2s on the 80th is dropped to about 27. This is best case highway MPG.

It depends on driving conditions too, temps, elevation, highway vs city etc… I’m at 30,000 miles and have short commutes in city conditions as a daily driver in extreme desert heat, mostly at roughly 2,200ft. Lifetime I’ve been getting 18.4 MPG on a true 37 and 3.73. On highway rides in between 22-24 MPG usually. When speed limits are 75+ the truck gets roughly 21.

 

[Rusty PW]

37's, 3.73 gears, 4" lift. Strictly in town, between 18 and 20 mpg. Back and forth to work, it's about 20 mpg. Highway, it will see about 24. I've lost anywhere from 2 to 4 mpg with the 37's.

 

[BlueScapegoat]

Well, comparing stock for stock, my last gladiator got equal or greater to what the ram folks are reporting. It was an 80th anniversary, basically a sport in overland clothes …

my current rubicon struggles to get 25mpg highway whereas the 80th would get as good as 31mpg. When I lifted and put 37” KO2s on the 80th is dropped to about 27. This is best case highway MPG.

My friend has a stock '20 Ram EcoD and he gets low 30s regularly, also anecdotal. Magazines and the EPA that test vehicles in a controlled manner get worse MPG with the Gladiator, it's just the truth. Look at the shape of them and it's obvious why.

It takes the same amount of energy to push a given vehicle down the road regardless of gear ratio. Horsepower is work done over time. HP = Torque X RPM / 5252. If you lower your RPM with longer gears then you need to increase the load on the engine at a given speed to accomplish the same work. What you need is a BSFC graph for the EcoDiesel, good luck finding one.

 

[Ericshere03]

My friend has a stock '20 Ram EcoD and he gets low 30s regularly, also anecdotal. Magazines and the EPA that test vehicles in a controlled manner get worse MPG with the Gladiator, it's just the truth. Look at the shape of them and it's obvious why.

It takes the same amount of energy to push a given vehicle down the road regardless of gear ratio. Horsepower is work done over time. HP = Torque X RPM / 5252. If you lower your RPM with longer gears then you need to increase the load on the engine at a given speed to accomplish the same work. What you need is a BSFC graph for the EcoDiesel, good luck finding one.

Right, I was making a point that the story wasn’t complete without including the area. The gladiator is smaller than a ram, therefore the drag coefficient times the surface area may be closer to equal. I don’t have the figures to calculate. So speculation on top of speculation. I will say I believe the super stock and street tired gladiator meets the rams efficiency ….

and yea, I looked for a while for a BSCF chart, no dice either … this would be helpful for rehearing, we’ve all just been guessing.

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