I doubt that. According to this site https://en-us.topographic-map.com/map-75k/Colorado/ the avg elevation of CO is ~6750, which results in about a 20% loss of engine power. For a 180 hp 4.0 that's about 36 hp off the top. Hell, that's like you're running a 2.4 at sea level. That's noticeable, and I'd think more so than a 5% gearing difference.
Re-gearing for 35s (need some build advice)
- Thread starter RockyMountain_TJ
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I doubt that. According to this site https://en-us.topographic-map.com/map-75k/Colorado/ the avg elevation of CO is ~6750, which results in about a 20% loss of engine power. For a 180 hp 4.0 that's about 36 hp off the top. Hell, that's like you're running a 2.4 at sea level. That's noticeable, and I'd think more so than a 5% gearing difference.
It is even MORE important at high elevation , ( contrary to what you may have heard ) .
My horsepower drops from a not too inspiring 181 net h.p. to a ground pounding 132.13 net corrected h.p. at my house.
that is some serious traffic down there. I'm happy my pickup has 3.73/35's when i venture that way
It's also very close to sea level. Elevation kills power. If elevation and/or mountains are on your agenda, 5.13 is what you will wish you had if you don't.
I genuinely don't understand why so many folks are scared of gearing deep. As if it'll burn up your motor or something.
I've been passively reading Jeep forums/groups for a couple years, and I can't recall ever hearing someone that legitimately regretted "overgearing". The contrary I've seen numerous times.
If considering between 2 ratios (4.88 vs 5.13 such as here), I'd always go for the deeper ratio.
I've been passively reading Jeep forums/groups for a couple years, and I can't recall ever hearing someone that legitimately regretted "overgearing". The contrary I've seen numerous times.
If considering between 2 ratios (4.88 vs 5.13 such as here), I'd always go for the deeper ratio.
It baffles me. All people need to do is look at what rpms the TJ with the 3 speed automatic was running right out the factory door to realize no one is regearing deep enough at any altitude. There are people in this very thread who should know better, but won't let go of old poor recommendations.
Right.
I can see an argument against regearing for diesels. In fact there are certain (poorly designed) diesel vehicles out there that have confirmed lower life spans when run at 70+ with the stock gearing/tires. But none of that applies to Jeeps.
I just spoke with Brook who runs RGA and they're revamping how they do some things. He said one guy no longer has to answer all the emails which was causing some not to get replied to, they're farming them out to the entire staff so they get answered in a timely manner.
Makes sense. I told them I’ll buy shafts from them in future so no hard feelings.
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It's not that difficult of a project to regear if you have the time and patience and tools. I regeared 5 years ago and remember that pressing on and off the pinion bearing and carrior bearings were the tough part for me. It was a rewarding upgrade learning how to take care of them on your own. I was in the same boat at you 5 speed and 35s, I went with 4.56s that served me well. 4.88s would have been my choice if I did it again. 5.13s would have been a little deep for me and my driving style.
After driving a few thousand miles on my new rig. I have 37s, 6 speed and 4.88s I find my self in the same situation. I could have gone 5.13s but I am happy with my current setup.
It's not that difficult of a project to regear if you have the time and patience and tools. I regeared 5 years ago and remember that pressing on and off the pinion bearing and carrior bearings were the tough part for me. It was a rewarding upgrade learning how to take care of them on your own. I was in the same boat at you 5 speed and 35s, I went with 4.56s that served me well. 4.88s would have been my choice if I did it again. 5.13s would have been a little deep for me and my driving style.
After driving a few thousand miles on my new rig. I have 37s, 6 speed and 4.88s I find my self in the same situation. I could have gone 5.13s but I am happy with my current setup.
Those groups are why I quit participating in most of them. I can't deal with the repeated answers from "shops" who tell folks that they run the stock 3.73's on 37's with the 42RLE and it's just about perfect.
Colorado sucks! Tell a friend... we're full
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