New gearsets for 6MT?

[AustinL911]

Just brainstorming on my way to work this morning. But, I wonder if it would be possible to regear the Aisin 6MT in the JLs? I've always felt that having 2 overdrives was a bit ridiculous, not to mention how tall Reverse is.

I think it'd be fun to have one (again, if it's even possible) arranged as such:

R L 12345

L = Granny gear for crawling
1 = Low enough to start from a stop
4 = 1:1
5 = OD (somewhere between current 5th and 6th ratios)
R = Much shorter

Thoughts on my random thoughts?

Someone with more money than me should try this.

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[Reflektr]

I agree that the gearing with the manual transmissions in these things can feel a bit wonky. But I also believe it depends on what axle ratio/tire size you’re running as well. My Jeep came stock with a 4.10 axle and 33” tires. Keep in mind that I came from a daily driven 400hp v8 with a 3.92 axle and 35” tires. The Jeep is a v6. When I first started driving the Jeep, it immediately felt like a gutless wonder. First gear was just to get rolling, second was to keep from getting run over, third was adequate for neighborhoods, fourth was really doing something now, and if I had made it to fifth by the time I had got to work, then I was more than likely speeding.

That was my first impression. Now after driving this thing for two months, I can tell you that if you are running 4.10 gears and 33” tires, the higher gears are not completely useless. For the interstate, I can utilize sixth gear and it cruises nicely around 2,000rpms getting around 20mpg. For my daily commute, I’ve found that fifth gear is adequate running about 60mph at around 2,000rpms give or take, getting over 20mpg.

It has never felt either luggy, nor whined-out. Nor has the mileage gained significantly or dropped off. Something to ponder that most people who buy a Jerp often neglect to think of is that people forget just what these things can really do. Which is really boogie off the beaten path. Just one peek under the ol’ girl’s skirt can tell the average consumer that. And I think that may have something to do with its on-road mannerisms with the 6-speed manual. They had to make it able to crawl around as well as keep up on the trail in 4lo, but also keep from getting run clean-over in modern-day city traffic. There lies the conundrum. I’ve gotten used to mine and have rather taken a shine to it.

 

[bd100]

For towing, I would have been happier with 1-4 for accel, 5 direct drive, 6 overdrive. And a much better reverse.

 

[grimmjeeper]

It's a lot easier to just put shorter (higher number) axle gears in. Having at transmission with a deeper low first gear and only 1 overdrive would just let you run taller axle gears and give you the same real world effect.

 

[Stetson]

I agree that the gearing with the manual transmissions in these things can feel a bit wonky. But I also believe it depends on what axle ratio/tire size you’re running as well. My Jeep came stock with a 4.10 axle and 33” tires. Keep in mind that I came from a daily driven 400hp v8 with a 3.92 axle and 35” tires. The Jeep is a v6. When I first started driving the Jeep, it immediately felt like a gutless wonder. First gear was just to get rolling, second was to keep from getting run over, third was adequate for neighborhoods, fourth was really doing something now, and if I had made it to fifth by the time I had got to work, then I was more than likely speeding.

That was my first impression. Now after driving this thing for two months, I can tell you that if you are running 4.10 gears and 33” tires, the higher gears are not completely useless. For the interstate, I can utilize sixth gear and it cruises nicely around 2,000rpms getting around 20mpg. For my daily commute, I’ve found that fifth gear is adequate running about 60mph at around 2,000rpms give or take, getting over 20mpg.

It has never felt either luggy, nor whined-out. Nor has the mileage gained significantly or dropped off. Something to ponder that most people who buy a Jerp often neglect to think of is that people forget just what these things can really do. Which is really boogie off the beaten path. Just one peek under the ol’ girl’s skirt can tell the average consumer that. And I think that may have something to do with its on-road mannerisms with the 6-speed manual. They had to make it able to crawl around as well as keep up on the trail in 4lo, but also keep from getting run clean-over in modern-day city traffic. There lies the conundrum. I’ve gotten used to mine and have rather taken a shine to it.

I agree 100%. I have a Willy’s with the 6MT and the 4.10 gears and I think it is great. I put a flow master exhaust on it so I can hear it and it’s a fun ride to bump around in. Gearing and gears are A-OK with me. 1-4 around town and 5-6 on the highway.

 

[Reflektr]

I agree 100%. I have a Willy’s with the 6MT and the 4.10 gears and I think it is great. I put a flow master exhaust on it so I can hear it and it’s a fun ride to bump around in. Gearing and gears are A-OK with me. 1-4 around town and 5-6 on the highway.

Once you get used to it, it is actually pretty decent. It’s everyone else on the road who has the problem with it Most of my driving is rural two-lane, only slowing down for a few 35mph towns. So 4th gear gets utilized quite a bit in my daily commute.

 

[Stetson]

Once you get used to it, it is actually pretty decent. It’s everyone else on the road who has the problem with it Most of my driving is rural two-lane, only slowing down for a few 35mph towns. So 4th gear gets utilized quite a bit in my daily commute.

Same with me. I don’t do a lot of highway driving. I bump around town with it. A little highway to get to work and I tow it with my RV. 1st trip in a couple of weeks to Moab and then Sedona in November. The manual trans is just fine with me.

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