kevnls
New Member
But I'm 100% open to what you're saying. I just find it very interesting that I've found myself with this sorta niche situation that this forum seems to talk about theoretically as opposed to empirically.
What gear ratio should I install in my Jeep Wrangler TJ / LJ? (and other re-gearing FAQs)
- Thread starter Chris
- Start date
But I'm 100% open to what you're saying. I just find it very interesting that I've found myself with this sorta niche situation that this forum seems to talk about theoretically as opposed to empirically.
The middle gears are irrelevant because you will end up in whatever gear is appropriate for the moment. You focus on the final drive gear because you cannot change that and you do not want to end up with it being not enough.
Also, understand that the 3 speed automatic was geared deeper than all other TJ transmissions.
I don’t always just compare top end either, but to me a stock 6 speed 2.4L with 3.73s was under geared from the factory for highway cruising, and didn’t have enough rpm in 6th. So basing any new ratios on that at all, to me anyways, would not produce desirable results.
The 4.56 setup as you said will add about 200 rpm over stock. That will help with the heavier tires. It will overall feel about like stock. If you’re happy with that, then 4.56 will suit you fine. Personally, I would want the gearing a notch lower than stock. Which would push me to 4.88 for 31-32” tires.
If you’re not using 1st or 6th anyways, then it’s really not going to matter much. The gears are close enough in the middle that you can find something to drive in no matter what ratio you pick.
kevnls
New Member
Thanks guys! I really appreciate the help. That'll give me more to think on. That totally makes sense too because if the 05 TJ had the same gear ratios for the 4-cylinder and the V6 then it seems like one of them is going to be either under or over geared, and it would make sense it would likely be the former with the 4-cylinder.
Cheers!
Cheers!
Hello all.
Any recommendation where to buy a 5.13 gear set with install kit for my 05 Rubicon with 42RLE auto and 35” tires?
I searched for Yukon Gear in amazon and are sold out. Anyone can recommend a good set?
Regards
Mariano
Any recommendation where to buy a 5.13 gear set with install kit for my 05 Rubicon with 42RLE auto and 35” tires?
I searched for Yukon Gear in amazon and are sold out. Anyone can recommend a good set?
Regards
Mariano
Thanks. I’m not sure to go with 5.38.
I use the jeep as daily driver and also go often to sand dunes and with the rubicon y-case may be too much?
That transfer case will be a poor choice in sand with either of those ratios. Go 5.38 to compensate for chryslers poor choice in transmission overdrive ratio.
As stated by Ricky, you will not be able to tell a difference between 5.13 and 5.38 off-road - they will both be super low with the rubicon case.
The OD on the transmission sucks for highway use and the 4.0L, so for 35’s you are best off compromising on the t-case gearing and going with the lower ratio to benefit the road. The fact that you daily it supports that even more. 5.13 is a half measure choice that you only make if you are limited by a front Dana 30. If you can do 5.38s, do them.
The reality is that 5.38 still is not enough gear for 35s and the 42rle, but it is the most we can reasonably do.
If it were me I’d pay the extra to do 5.89s, but I know most aren’t going to do that so I don’t suggest it often.
Don’t go to Amazon, go to revolution.
https://revolutiongear.com/revoluti...d44thick-front-and-rear-with-timken-bearings/
There are concerns with ring and pinion strength and driveshaft rpms with 5.89.
This is on top of the costs and effort to be able to install them in the first place.
Anyone have same setup that can share experiences?. (42RLE, 35” and 5.38).
In highway with 5.38 at 65 mp/h still in 4th (OD) gear or downs to 3rd?
I saw all the RPM calculators and tech info, but nothing compares to real life experience.
Thanks, I always prefer Amazon because they can ship to my country with fixed customs and shipping rates. If I buy direct I have to ship it to a freight forwarder and pay way more. (I live in Chile)
I would think the strength would be okay, but I don’t know of enough people running that ratio in a Dana 44 to really know of any real world feedback.
The driveshaft rpm I can definitely see the issue with, and I don’t know what you do about it. In all reality, the 42 just has undesirable ratios to live with. It is a compromise transmission no matter how you go about it.
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