3.73 vs 4.10/4.11 Debate - Page 2 - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 08-24-2017, 09:16 AM   #26 (permalink)
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I think your mileage gains will be marginal at best. If you want to try before regearing one or the other, drop your front shaft and run the 3.73's in the rear to see. That's what I'd do.
Wouldn't that still be hard on the diff/axles/tires? Something is going to have to make up that difference in gearing...even though the DS isn't there to force it, I'm guessing the tires would be wearing faster?
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Old 08-24-2017, 09:25 AM   #27 (permalink)
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You are already running the 4.10's. I'm suggesting that you swap in the rear with the 3.73's and take the front shaft off to prevent it from being put in 4wd and destroying your case. You can run it with the 3.73's and see what you like better. When you decide, gear the front or rear to match the other.
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Old 08-24-2017, 09:52 AM   #28 (permalink)
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You are already running the 4.10's. I'm suggesting that you swap in the rear with the 3.73's and take the front shaft off to prevent it from being put in 4wd and destroying your case. You can run it with the 3.73's and see what you like better. When you decide, gear the front or rear to match the other.
But the carrier in the front is still turning at 4.10 pace and the rear at 3.73 pace...wouldn't this potentially harm one or the other? Or does the shaft not being in reduce the load enough to be negligible?
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Old 08-24-2017, 10:14 AM   #29 (permalink)
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With the front drive shaft out, there is 0 load from the front axle gears.
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Old 08-24-2017, 10:46 AM   #30 (permalink)
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With the front drive shaft out, there is 0 load from the front axle gears.
So the carriers will spin at different rates, but since there is no connecting point between the two, then there is no problem...got it.

I was thinking that at x mph the carriers would be trying to match by the front wheels spinning faster at a higher gear. DOH!
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Old 08-24-2017, 12:17 PM   #31 (permalink)
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Right.

To go a step farther, taking the front shaft out is only so that if 4wd were engaged, there would be no issue.

You can swap the rear axle to 3.73, 2.73, or any other ratio, and drive in 2 wheel drive/rear wheel drive without a problem. Yes, the front tires are connected to the axle shafts, axle gears, and front drive shaft. As long as you are in 2 wheel, the t-case is only connected to the rear drive shaft on your Jeep.
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Old 08-24-2017, 02:55 PM   #32 (permalink)
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Wow, i really hope you just go with the 4.10 gears OP. Your "NEVER" gonna go above 33's, OK.... Go 4.10's, enjoy your extra torque. Then when you decide to get 35's like will naturally happen, you will be fine with 4.10's and your 5.9L magnum V8. All this 3.73 or 3.55, or I have 2.73's jargin is BS. We all know real off road ratio's start with the number 4 or higher
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Old 08-24-2017, 04:20 PM   #33 (permalink)
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Have you just plugged everything into a gearing calculator to determine what your RPMs will be at cruising speed?

What's the magnum motor like to cruise the highway at, 1800RPM?

The decision is typically can you stand going 60-65? Or do you have to cruise 75-80?

If you want to cruise faster the 3.73s would likely net you a better cruising RPM, but with the additional wind resistance at higher speeds the efficiency gain will be minimal.

Ultimately, you will want 35s... and the 4:10 power. No one wishes for less power, and smaller tires.
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Old 08-25-2017, 04:23 AM   #34 (permalink)
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Have you just plugged everything into a gearing calculator to determine what your RPMs will be at cruising speed?

What's the magnum motor like to cruise the highway at, 1800RPM?

The decision is typically can you stand going 60-65? Or do you have to cruise 75-80?

If you want to cruise faster the 3.73s would likely net you a better cruising RPM, but with the additional wind resistance at higher speeds the efficiency gain will be minimal.

Ultimately, you will want 35s... and the 4:10 power. No one wishes for less power, and smaller tires.
I honestly never see myself going to 35's. I don't "wheel" a lot, and when I do it's not big things...more of an "overlanding" style.

I cruise 65-75, and at 65 my RPMs are at ~2250. I plugged it all into a RPM calc and it was like 1900RPM with 3.55, 2125 with 3.73...That's why I decided to try 4.10...the difference wasn't that great.
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Old 08-25-2017, 06:17 AM   #35 (permalink)
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The 4.10s are the right way to go.
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Old 08-26-2017, 12:44 PM   #36 (permalink)
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4.10

I have 4.10s in my 5.9/46re/ 8.8 swap. It wouldn't seem worth the change but I was able to find a 4.10 8.8 easily. I traded my 3.73 30 and 35 combo for a 4.10 front. At first I thought I still wanted more gear but I've gotten used to it and it does fine on the highway. I've driven a 4.0 auto on 35s with 4.10 and it's no comparison. With the 5.9 the trans isnt hunting for gears, or in and out of overdrive. I think it would only be better with a manual trans but I had auto jeep and auto donor, so I went that route.
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