2021 Sahara 6sp regear...

[Cutterone]

SO here's the rub folks. When it is time for new shoes, going to go to 285-75-17 Toyo OC AT3 (34"), with an appropriate wheel and mild lift. With the inadequate gearing provided with the Sahara (3.45) and the odd ratios of the 6sp, I'm thinking of a regear to 4.56... Those of you who have done this or similar please advise as to the best brand gear sets to look into, do I need new carriers..etc. My daily is all back roads, 20 miles door to door to work at Hospital, never over 50 mph much, will a regear bring a noticeable improvement in performance in these conditions or is it more to gain back highway speed performance and use of all gears...any info and experience is appreciated...Good day Ladies and Gents...

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[Some Random Guy]

You’ll want a master overhaul kit.
As for brand, I think any of the big names are good. Yukon, Dana Spicer, G2, Revolution. I’m switching to Dana from Yukon right now due to unacceptable noise they call “normal”, but that’s one issue amongst tens of thousands of sales.
I think the Dana gears are pre treated, so they should be quieter. Yukon actually recommended them because their current batch won’t get along with my diff.
Have you considered a locker while you’re already paying someone to tear down the carrier?
And yes, the regear will be very noticeable on your commute. It does shorten up 1st quite a bit is the closest thing to annoying, but the acceleration is noticeably better.

 

[aldo98229]

I own a 2018 Sahara V6 with a Mopar lift, 35x12.5-inch ATs and stock 3.45 gears.

These are my observations:

1. I can’t speak for the 6-speed manual, but with the 8-speed automatic, “performance” is pretty much unchanged. The automatic transmission has enough gears to keep the Jeep moving; the tranny simply downshifts and stays in lower gears longer. It hardly ever shifts into 8th gear on the freeway any more
2. My fuel economy did take a big hit. Combining larger, wider, heavier tires, with the transmission sticking to lower gears, my MPG is now 13-14 MPG

I’ve been looking to regear to 4.56 as well, not for “performance” reasons but to decrease my fuel consumption. However, the most I can hope to regain is 1-2 MPG. That’s not enough to justify spending $2,500 in a regear job.

Another alternative is to downsize to the same 285/75R17 (34x11) tire size you are looking to upgrade to. Going this route I expect to regain about 2 MPG as well (15-17 MPG), but at a much lower cost —only $500 after I resell my 35s. The catch is there’s a shortage of tires in this size at the moment.

If I were to do all over again, I’d still do the Mopar lift, still not touch the gearing, but get a set of 34x11 inch tires instead.

Hope this gives you some food for thought.

 

[Cutterone]

I own a 2018 Sahara V6 with a Mopar lift, 35x12.5-inch ATs and stock 3.45 gears.

These are my observations:

1. I can’t speak for the 6-speed manual, but with the 8-speed automatic, “performance” is pretty much unchanged. The automatic transmission has enough gears to keep the Jeep moving; the tranny simply downshifts and stays in lower gears longer. It hardly ever shifts into 8th gear on the freeway any more
2. My fuel economy did take a big hit. Combining larger, wider, heavier tires, with the transmission sticking to lower gears, my MPG is now 13-14 MPG

I’ve been looking to regear to 4.56 as well, not for “performance” reasons but to decrease my fuel consumption. However, the most I can hope to regain is 1-2 MPG. That’s not enough to justify spending $2,500 in a regear job.

Another alternative is to downsize to the same 285/75R17 (34x11) tire size you are looking to upgrade to. Going this route I expect to regain about 2 MPG as well (15-17 MPG), but at a much lower cost —only $500 after I resell my 35s. The catch is there’s a shortage of tires in this size at the moment.

If I were to do all over again, I’d still do the Mopar lift, still not touch the gearing, but get a set of 34x11 inch tires instead.

Hope this gives you some food for thought.

for sure thanks, the other option is leave it alone and just put 275-70-18 (33) on my stock wheels, only issue I have with that is it'll be a load E tire I was trying to avoid, whereas the 285-75-17 OC AT3 can be had in a C...

 

[word302]

SO here's the rub folks. When it is time for new shoes, going to go to 285-75-17 Toyo OC AT3 (34"), with an appropriate wheel and mild lift. With the inadequate gearing provided with the Sahara (3.45) and the odd ratios of the 6sp, I'm thinking of a regear to 4.56... Those of you who have done this or similar please advise as to the best brand gear sets to look into, do I need new carriers..etc. My daily is all back roads, 20 miles door to door to work at Hospital, never over 50 mph much, will a regear bring a noticeable improvement in performance in these conditions or is it more to gain back highway speed performance and use of all gears...any info and experience is appreciated...Good day Ladies and Gents...

Get Dana Spicer gears and master overhaul kits. Avoid Yukon like the plague. 4.56 should be perfect for you with that tire combo. If you were in the mountains I'd consider 4.88.

 

[word302]

for sure thanks, the other option is leave it alone and just put 275-70-18 (33) on my stock wheels, only issue I have with that is it'll be a load E tire I was trying to avoid, whereas the 285-75-17 OC AT3 can be had in a C...

Yeah those load E tires will kill your back.

 

[word302]

I own a 2018 Sahara V6 with a Mopar lift, 35x12.5-inch ATs and stock 3.45 gears.

These are my observations:

1. I can’t speak for the 6-speed manual, but with the 8-speed automatic, “performance” is pretty much unchanged. The automatic transmission has enough gears to keep the Jeep moving; the tranny simply downshifts and stays in lower gears longer. It hardly ever shifts into 8th gear on the freeway any more
2. My fuel economy did take a big hit. Combining larger, wider, heavier tires, with the transmission sticking to lower gears, my MPG is now 13-14 MPG

I’ve been looking to regear to 4.56 as well, not for “performance” reasons but to decrease my fuel consumption. However, the most I can hope to regain is 1-2 MPG. That’s not enough to justify spending $2,500 in a regear job.

Another alternative is to downsize to the same 285/75R17 (34x11) tire size you are looking to upgrade to. Going this route I expect to regain about 2 MPG as well (15-17 MPG), but at a much lower cost —only $500 after I resell my 35s. The catch is there’s a shortage of tires in this size at the moment.

If I were to do all over again, I’d still do the Mopar lift, still not touch the gearing, but get a set of 34x11 inch tires instead.

Hope this gives you some food for thought.

I'm surprised your fuel economy took that big of a got, especially with the automatic. I'm averaging 15 with heavy 37s and beadlocks with the manual transmission and 5.13 gears. I'm in Oregon where almost nothing is flat.

 

[aldo98229]

for sure thanks, the other option is leave it alone and just put 275-70-18 (33) on my stock wheels, only issue I have with that is it'll be a load E tire I was trying to avoid, whereas the 285-75-17 OC AT3 can be had in a C...

At first my Sahara had a Daystar “Comfort Ride” leveling kit (3/4-inch in front, 1/2-inch in rear), and 275/70R18 KO2s on the factory wheels. It was the perfect setup, IMO: the Jeep looked great, the ride and handling remained stock, and my MPG was a very acceptable 18-20 MPG.

Yes, the tires were E-load, but weighed a lot less than the 35s —or the 34s for that matter.

 

[Cutterone]

At first my Sahara had a Daystar “Comfort Ride” leveling kit (3/4-inch in front, 1/2-inch in rear), and 275/70R18 KO2s on the factory wheels. It was the perfect setup, IMO: the Jeep looked great, the ride and handling remained stock, and my MPG was a very acceptable 18-20 MPG.

Yes, the tires were E-load, but weighed a lot less than the 35s —or the 34s for that matter.

That's the dilemma, half of the people say E tires are fine if aired in the lower 30's, the other half says it will rattle your brain out!

 

[aldo98229]

That's the dilemma, half of the people say E tires are fine if aired in the lower 30's, the other half says it will rattle your brain out!

The ride was pretty close to stock with those 275/70R18 KO2s.

 

[Cutterone]

The ride was pretty close to stock with those 275/70R18 KO2s.

Good to know. Another option is go tried and true route, get new wheels 5.2 backspace, the all too common 285-70-17, and maybe a leveling kit, cheap easy done, and staying away from regear. Unfortunately the 6sp leesens the tire choices without a regear but no regrets. I'm 43 and yet to own an auto, but most likely will go that route finally next Jeep, which I'm hoping is 10 years from now! These things cost too much!!!

 

[jbcrane]

If I were to do all over again, I’d still do the Mopar lift, still not touch the gearing, but get a set of 34x11 inch tires instead.
Hope this gives you some food for thought.

It does. Thank you. This is exactly what I'm planning for exactly the reasons you site. Problem is, 285/75's are non-existent at the moment. Fortunately I'm in no hurry - lift kit is in the garage, new wheels and tailgate reinforcement kit (ounce of prevention kind of guy) are coming and everything else is ready. It's just a matter of waiting for the tire size I'm planning. I'm a 6-speed manual and hope to avoid regearing... thinking this setup will get it done.

 

[Billyg73]

SO here's the rub folks. When it is time for new shoes, going to go to 285-75-17 Toyo OC AT3 (34"), with an appropriate wheel and mild lift. With the inadequate gearing provided with the Sahara (3.45) and the odd ratios of the 6sp, I'm thinking of a regear to 4.56... Those of you who have done this or similar please advise as to the best brand gear sets to look into, do I need new carriers..etc. My daily is all back roads, 20 miles door to door to work at Hospital, never over 50 mph much, will a regear bring a noticeable improvement in performance in these conditions or is it more to gain back highway speed performance and use of all gears...any info and experience is appreciated...Good day Ladies and Gents...

Hey - REally curious what you did an how it worked out. I have a sahara with 6sp MT and the 3.45., BFG take off rubicon 392 wheels. Right now I don't use 6, total waste of a gear. I was looking at 4.10 or 4.56. I ran the numbers and the 4.10 would give me a 6th that is more like the 5th gearing ( hiway) and 80 MPH at 2500. Seemed perfect, the 4.56 seemed to take a LOT of high end away.

Any insight for the 4.10 s the 4.56 would be AWESOME! I dont think I will goto 35s for another year or maybe 2.

 

[word302]

Hey - REally curious what you did an how it worked out. I have a sahara with 6sp MT and the 3.45., BFG take off rubicon 392 wheels. Right now I don't use 6, total waste of a gear. I was looking at 4.10 or 4.56. I ran the numbers and the 4.10 would give me a 6th that is more like the 5th gearing ( hiway) and 80 MPH at 2500. Seemed perfect, the 4.56 seemed to take a LOT of high end away.

Any insight for the 4.10 s the 4.56 would be AWESOME! I dont think I will goto 35s for another year or maybe 2.

If you plan on swapping to 35s down the road I wouldn't even consider the 4.10s. 4.56 or even 4.88 depending on where you live/drive.

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