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Old 06-24-2020, 09:22 AM #16
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Nothing worth crying over
No, but it puts better MPG just a bit more out of reach. I think the blowers are a great option, but not for MPG.
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Old 06-24-2020, 09:35 AM #17
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I always thought MPG gets worse with a regear. I went from 35's with stock gears to 4.88s and interstate mpg went down by 1 or 2. But I got a ton of power and can use cruise control again so I would say it was well worth it.
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Old 06-24-2020, 10:30 AM #18
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I always thought MPG gets worse with a regear. I went from 35's with stock gears to 4.88s and interstate mpg went down by 1 or 2. But I got a ton of power and can use cruise control again so I would say it was well worth it.
That's cuz you a V8 brudda ...

I want the supercharger because I want passing / pulling power when pulling a trailer. And Im still dealing with the downshift to 4th gear when theres a big hill / incline. And any head wind forget about it...

I just was power to stay in OD ..
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Old 06-24-2020, 10:59 AM #19
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That's cuz you a V8 brudda ...

I want the supercharger because I want passing / pulling power when pulling a trailer. And Im still dealing with the downshift to 4th gear when theres a big hill / incline. And any head wind forget about it...

I just was power to stay in OD ..
Maybe if I got 4.56 gears mpg would stay the same as stock, I just don't see how regearing could give better mileage than stock gears with the RPM being so low. Basically I'm just saying don't regear to help mileage because if anything it will probably decrease it.

Now with my 37's the 4.88s probably make more sense than with my 35's. More of an even tradeoff of power vs freeway RPM. But I have the V8 so make of that what you will.
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Old 06-24-2020, 11:14 AM #20
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debating if i need a regear
i'm going up to 285/75r17 soon

i have a the urd super charger already. but i guess i'll see after it comes back.
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Old 06-24-2020, 12:41 PM #21
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Checkout this video, he has 4.88 on 33’s:
YouTube

Mine is in the shop right now getting 4.88 and I have 33’s. I do pull a square drop trailer though. If I need bigger tires to help with RPM’s, I’ll go 285/75/17.
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Old 06-24-2020, 12:55 PM #22
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debating if i need a regear
i'm going up to 285/75r17 soon

i have a the urd super charger already. but i guess i'll see after it comes back.
You'll want it. I think you can get away with it in flat areas, but anywhere where hills are it's gonna be needed. I haven't put my 4.88's in yet, waiting for my front locker to come, but with just a full front bumper it's definitely rough.
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Old 06-24-2020, 04:53 PM #23
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Maybe if I got 4.56 gears mpg would stay the same as stock, I just don't see how regearing could give better mileage than stock gears with the RPM being so low. Basically I'm just saying don't regear to help mileage because if anything it will probably decrease it.

Now with my 37's the 4.88s probably make more sense than with my 35's. More of an even tradeoff of power vs freeway RPM. But I have the V8 so make of that what you will.
Moving to a numerically higher gear ratio sometimes increase mileage. Not a direct comparison but I had a 2008 Jeep JK with a six speed manual and 3.21 gears from the factory. Still running the factory size tire, (32" MT), I regeared to 4.88 and everyone thought I would blow the motor up, burn so much gas etc. My overall MPG change was... basically nothing. I lost a small amount during high way driving, (around 18 vs 20), but with mixed driving my mileage actually went up, (from 15 to about 18). Although the motor was running higher on the highway it required much less gas to keep moving and around town it was so much better to drive. (I also basically turned my six speed into a five speed plus granny gear which was awesome).
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Old 09-06-2020, 10:12 PM #24
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Exclamation Pinion gear concerns??

For those running the 4.88's, do you have a concern about the pinion gear being weak? I've read some comments from some FJ guys and 5th gens that teeth "go missing".

I am getting ready to order gears and have 285/75's. I'd go 4.56 to be safe... but coming from slow dual sport motorcycles (WR250R), it seems the 4Runner does just fine at higher RPM's as well? (~200rpm difference according to grimjeeper website)

I usually take 1-2 road trips per year and the rest of the time is city, limited highway, some off-roading, and occasional light towing.

If the pinion "issues" are not much of a concern, then the 4.88's really do sound more appealing. I'd love to hear some feedback!
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Old 09-06-2020, 10:33 PM #25
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For those running the 4.88's, do you have a concern about the pinion gear being weak? I've read some comments from some FJ guys and 5th gens that teeth "go missing".

I am getting ready to order gears and have 285/75's. I'd go 4.56 to be safe... but coming from slow dual sport motorcycles (WR250R), it seems the 4Runner does just fine at higher RPM's as well? (~200rpm difference according to grimjeeper website)

I usually take 1-2 road trips per year and the rest of the time is city, limited highway, some off-roading, and occasional light towing.

If the pinion "issues" are not much of a concern, then the 4.88's really do sound more appealing. I'd love to hear some feedback!
No issues soo far ... I've trail my rig alot lately. And when camping fully loaded. No issues...

Down side is when I'm loaded down my tranny is hot when going up too steep a hill ... Going to Big Bear I hit like 242 just going up the 18fwy.
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Old 09-07-2020, 04:05 PM #26
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Where is the torque peak of this motor.......you want to be at around 3/4 that rpm at your freeway cruising speed. Gear accordingly using tire size and those calculator numbers. This is for best MPG at cruise. I would shoot for what tire and gear will get you to 2800rpm at 70mph if I was re-gearing. 285's seem fine on stock gear for me.
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Old 09-07-2020, 06:03 PM #27
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285's with stock gearing is great for wheelin. Granted I keep the truck empty except recovery gear and a full-sized spare. But I certainly wouldn't want to tow anything with this setup.
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Old 09-07-2020, 07:00 PM #28
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No issues soo far ... I've trail my rig alot lately. And when camping fully loaded. No issues...

Down side is when I'm loaded down my tranny is hot when going up too steep a hill ... Going to Big Bear I hit like 242 just going up the 18fwy.
Do I understand correctly that you attribute higher trans temps to having installed lower (4.88) gears? I would have expected lower temps.
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Old 09-07-2020, 08:02 PM #29
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Do I understand correctly that you attribute higher trans temps to having installed lower (4.88) gears? I would have expected lower temps.
No I attribute my higher temps from climbing a steep grade and being close to 6300lbs when I'm fully loaded. The gears and 35's sure doesn't help either. 4.88's just means the trans is spinning faster than it normally would with 3.73 gears.

I'm putting in a 15,000btu trans cooler hopefully this will control higher temps I've been seeing.
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Old 09-07-2020, 10:02 PM #30
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I went with 4.56 with 295/70/17s. Its a great combo added power and only dropped my mpg by .1 .

I wanted to still be able to get in my garage and the truck feels stockish... a pleasure to drive. However, I can definitely see myself going bigger when I need new tires so I may have been too conservative.

once I retire it to trail only, I may regear again to 5.26 and slap 40s on... but for now its a badass commuter and still fun in the dirt.
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