Gear ratio

[TheBoogieman]

03-06 SE auto's have 4.56 axles too

I've never seen a set for sale where I live.

 

[Cooper Smith]

I've never seen a set for sale where I live.

Probably all in junkyards. I could see people not too willing to part out a 2.4 Jeep.

 

[Rut Row]

To add, there is no way 4.10 pushing 31s was the appropriate gear for all three transmissions available for the Rubicon.

Perhaps I'm misunderstanding your statement, but the 03 Rubi manual xmission came with 4.10 on 31s.

 

[bbaldwin237]

Perhaps I'm misunderstanding your statement, but the 03 Rubi manual xmission came with 4.10 on 31s.

He's saying throughout the life of the TJ Rubicon it came with three different transmissions: 42RLE 4-speed auto, NV3550 5-speed manual, and NSG-370 6-speed manual. The transmissions each have unique drive ratios across their gear set, yet each Rubicon came with 4.10 gears. The 4.10 gear set will perform differently for each transmission, meaning it couldn't possibly be the best ratio for each transmission. In reality, the axle ration should've changed depending on the transmission the vehicle was equipped with.

 

[Wsutherlin]

Thanks for all the reply’s, especially to those that didn’t go off topic.

 

[jjvw]

Perhaps I'm misunderstanding your statement, but the 03 Rubi manual xmission came with 4.10 on 31s.

That is correct. So did the ones equipped with the 42rle and the nsg370.

 

[GoldenGorilla]

Not that it matters but there is more than a fair bit of scuttlebutt pointing to the Rubi models being built around 33's from the factory and then shut down for reasons unknown but speculated about more than a bit. Mostly pointing to lawyers and bean counters teaming up against the design team. I know none of that to be fully accurate though but I've seen it enough that it explains the odd gearing.

I remember all that chatter. That's every car, but it felt like rollover fears from Suzukis and YJ were a more recent memory back then.

 

[hear]

especially to those that didn’t go off topic.

Sorry the free conversation sourced from a collective hundred plus years of jeep experience inspired by your topic wasn’t completely to your liking.

 

[Wsutherlin]

Sorry the free conversation sourced from a collective hundred plus years of jeep experience inspired by your topic wasn’t completely to your liking.

I said thanks for ALL the reply’s..
Don’t be a dick there big man.

 

[mrblaine]

I said thanks for ALL the reply’s..
Don’t be a dick there big man.

Yeah, but you qualified it which removes the thanks for those affected by the qualifier. That's like saying everyone was a dick except those who weren't. Pick one.

 

[hear]

If blaine is defending me then you probably actually did step in it, big man.

 

[lBasket]

 

[Wsutherlin]

Ok

Yeah, but you qualified it which removes the thanks for those affected by the qualifier. That's like saying everyone was a dick except those who weren't. Pick one.

Ok.
My wording was not up to yalls standards. Got it.

Thanks,

 

[Strizzo]

He's saying throughout the life of the TJ Rubicon it came with three different transmissions: 42RLE 4-speed auto, NV3550 5-speed manual, and NSG-370 6-speed manual. The transmissions each have unique drive ratios across their gear set, yet each Rubicon came with 4.10 gears. The 4.10 gear set will perform differently for each transmission, meaning it couldn't possibly be the best ratio for each transmission. In reality, the axle ration should've changed depending on the transmission the vehicle was equipped with.

and the rubicon still came standard with 4.10 gears through the 2024 year model, unless you opted for the extreme recon package with 35s. For 2025 you get 4.10 with the manual option, and 4.56 with the 8 speed auto, or 4.88 with the extreme recon package (optional with the manual as a standalone option).

 

[jjvw]

and the rubicon still came standard with 4.10 gears through the 2024 year model, unless you opted for the extreme recon package with 35s. For 2025 you get 4.10 with the manual option, and 4.56 with the 8 speed auto, or 4.88 with the extreme recon package (optional with the manual as a standalone option).

None of that is useful as a comparison to the TJ years without at least knowing the final drive ratios of the various transmissions after 2006.

 

[Strizzo]

None of that is useful as a comparison to the TJ years without at least knowing the final drive ratios of the various transmissions after 2006.

My point is that jeep probably didn't care that much.

the early years of the JK with the 3.8 kept the 42RLE, then that was replaced with another (5 speed auto?), then that was replaced with the first chrysler 8 speed, and now the 8 speed is a ZF 8HP, which was previously only included with the diesel option. I think the only powertrain option that got something other than standard 4.10 axle ratios with the rubicon package was the diesel, which got 3.73s.

 

[GoldenGorilla]

and the rubicon still came standard with 4.10 gears through the 2024 year model, unless you opted for the extreme recon package with 35s. For 2025 you get 4.10 with the manual option, and 4.56 with the 8 speed auto, or 4.88 with the extreme recon package (optional with the manual as a standalone option).

The JK and JL Rubicons have alot more power than the 4.0 TJ Rubicon. The 4.10 gears have never been an issue along with the 4:1 transfer case for rock crawling in any Rubicon (YMMV). For the TJ Rubicon it was always an issue with the high speed performance due to the limited hp of the 4.0. The JK 3.8 didn't do enough, but the Pentastar 3.6 did.

There were also other drive ratio changes happening. For instance the NSG370 5th gear was 1:1 while the 6th gear was 0.84:1 while in the NV3550 close ratio 4th gear was 1:1 and 5th was 0.78:1. Generally the 05/06 TJR and LJR manuals were fine on 33s because the 6 speed ratios were tighter with a lower overdrive.