Are you re-gearing for 35s or 37s?

Are you re-gearing for larger tires?


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Kentano

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OK, I wanted to update this as I said I'd report back after doing a little more offroading.

Around the highway, these gears don't have as much torque as I'd like. On anything but even/downhill surfaces, I need to be in 5th - 4th on steeper grades. 3rd is necessary for passing power under 65MPH - my original assumptions are correct. Gas mileage is also about 15-16MPG highway AND street (tires and lift add a bit of drag).

In short, I think going to 4.10 with 35's would be more comfortable.

Also, I had a chance to offroad a bit and put it in 4lo. On steep inclines with large rocks/rock shelves, I'll stall if I'm not feathering the clutch. The 3.6 is rather gutless under 1400 RPM, so I feel like I'll kiss my clutch good-bye a bit quicker than I originally anticipated. I think 4.10's will help some but ultimately, I think an engine with good torque at low revs will make this the ultimate off-roader.

I'll consider trading for diesel in a few years.
 

AZCrawl

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OK, I wanted to update this as I said I'd report back after doing a little more offroading.

Around the highway, these gears don't have as much torque as I'd like. On anything but even/downhill surfaces, I need to be in 5th - 4th on steeper grades. 3rd is necessary for passing power under 65MPH - my original assumptions are correct. Gas mileage is also about 15-16MPG highway AND street (tires and lift add a bit of drag).

In short, I think going to 4.10 with 35's would be more comfortable.

Also, I had a chance to offroad a bit and put it in 4lo. On steep inclines with large rocks/rock shelves, I'll stall if I'm not feathering the clutch. The 3.6 is rather gutless under 1400 RPM, so I feel like I'll kiss my clutch good-bye a bit quicker than I originally anticipated. I think 4.10's will help some but ultimately, I think an engine with good torque at low revs will make this the ultimate off-roader.

I'll consider trading for diesel in a few years.
Do you have a Sport? 4.10's will make it go big time, my Rubi gets up and goes!
 

Chocolate Thunder

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So it seems like the overwhelming majority of those going up to 35s are not gear swapping. Why is that? Feel it’s not needed or is it a matter of the cost of the gear swap? I’ll be buying a JLUR and likely going with 35” tires. I’d planned on gearing to 4.56 to restore lost torque and acceleration. Is this not common (new to Jeeps, not gear swaps)?
 

AZCrawl

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So it seems like the overwhelming majority of those going up to 35s are not gear swapping. Why is that? Feel it’s not needed or is it a matter of the cost of the gear swap? I’ll be buying a JLUR and likely going with 35” tires. I’d planned on gearing to 4.56 to restore lost torque and acceleration. Is this not common (new to Jeeps, not gear swaps)?
I think it is unnecessary going to 35's with this transmission. Heck, I am only going to 4.56 for 37's based on a gearing calculator.
 

Trailjeepin

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Anyone have a sport manual transmission with 3.45’s and 35’s? I have the dana 30 front and 44 rear. Not that it matters.

I’ll be going 35’s soon but not re-gearing until I buy a locker for the rear.

Wondering how it would be. The manual feels great and first is super low (transmission first gear ratio 5.13) Might be ok for awhile.
 
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AZCrawl

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Anyone have a sport manual transmission with 3.45’s and 35’s? I have the dana 30 front and 44 rear. Not that it matters.

I’ll be going 35’s soon but not re-gearing until I buy a locker for the rear.

Wondering how it would be. The manual feels great and first is super low 5.13. Might be ok for awhile.
I think 5.13's for 35's would be too low, you would regret that on the highway IMO.
 

Trailjeepin

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I think 5.13's for 35's would be too low, you would regret that on the highway IMO.
Sorry I meant that the transmission first gear ratio is 5.13. I have yet to stall this thing. Super easy to drive
 

Kentano

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Do you have a Sport? 4.10's will make it go big time, my Rubi gets up and goes!
I have the sport. Ya. I’m hoping rubicon takeoffs hit the forums to regear
 

OnlyOne

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On a Rubicon I don’t really notice a change going to 37’s. I also live at 7000 ft. So 35’s on a Rubi you will not notice. The only time I might notice a change, is on the highway with a head wind and it will shift from 8th to 6th at times.
 

Anthimus

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Going 37s without regearing for awhile. Probably will regear 2-3 years down the road when I'm out of warranty.
 

1quick1

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I've been perfectly happy with the 3.45's and larger tires. It feels faster than my last 2 door JK with 33's and 3.73 gears.
 

Geronimo

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Going to shoot for 2.5 lift and 37s. (At First) My big concern is not going up hill so much. It is going over a 13,000 ft pass and looking at a couple miles of steep down hill crawls. That's when proper gearing really shines ( for me at least.) Want to run to Ouray in August, would like to have 37s and 4:88s to do it up right. Run Black Bear backwards....
 

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OK, I wanted to update this as I said I'd report back after doing a little more offroading.

Around the highway, these gears don't have as much torque as I'd like. On anything but even/downhill surfaces, I need to be in 5th - 4th on steeper grades. 3rd is necessary for passing power under 65MPH - my original assumptions are correct. Gas mileage is also about 15-16MPG highway AND street (tires and lift add a bit of drag).

In short, I think going to 4.10 with 35's would be more comfortable.

Also, I had a chance to offroad a bit and put it in 4lo. On steep inclines with large rocks/rock shelves, I'll stall if I'm not feathering the clutch. The 3.6 is rather gutless under 1400 RPM, so I feel like I'll kiss my clutch good-bye a bit quicker than I originally anticipated. I think 4.10's will help some but ultimately, I think an engine with good torque at low revs will make this the ultimate off-roader.

I'll consider trading for diesel in a few years.
Nice thanks for the feedback, now I know I'll need to regear when I add 35's. I used a regearing calculator and the result was I needed 4.10, but I didn't want to believe it, until someone with real word experience confirmed it.
 
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matto

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Changed my gears to 4.88 on Toyo 38s and mopar 2" lift. Made the same trip 2 weeks ago and getting a lot better gas millage. I was getting between 6 and 10 mpg before. Now I'm getting almost 15. I also used a Tazer JL to reprogram tire size, gear ratio, and TPMS.
mpg.jpg
 

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