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Discussion Starter · #1 ·
Was thinking about this the other day and was curios if anyone knew why they changed trannys after having the 5 speed for so long? Is one better then the other? and if so what one and why?
 

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They had several 5 speeds actually, and the 6 speed came from Mercedes, it was probably cheaper to source them as at that time Chrysler was partnered with Daimler.. The 6 speed is on par with the other 5 speeds as far as input torque capacity, but offered a lower range first gear (4.46:1), which for offroaders equals a lower crawl ratio. Compared to the AX-15's 1st gear (3.83:1) and the NV3550 (4.01:1)
 

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Discussion Starter · #3 ·
They had several 5 speeds actually, and the 6 speed came from Mercedes, it was probably cheaper to source them as at that time Chrysler was partnered with Daimler.. The 6 speed is on par with the other 5 speeds as far as input torque capacity, but offered a lower range first gear (4.46:1), which for offroaders equals a lower crawl ratio. Compared to the AX-15's 1st gear (3.83:1) and the NV3550 (4.01:1)
Awesome! :Thanx:
 

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Figure i'd post this for comparison sake and to have them all in one place. The year next to is the years it came in the Wrangler behind the Inline 6 specifically

AX-15 (Mid 1988 - 1999)

1: 3.83:1
2: 2.33:1
3: 1.44:1
4: 1:1
5: 0.79:1
6: N/A

NV3550 (2000-2004)

1: 4.01:1
2: 2.33:1
3: 1.39:1
4: 1:1
5: 0.78:1
6: N/A

NSG370 (2005-2006)

1: 4.46:1
2: 2.61:1
3: 1.72:1
4: 1.25:1
5: 1:1
6: 0.84:1
 

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also the sixth gear as overdrive is a lot friendlier on the highway and gets me a lot more mpg then my other tj five speed driving buddies
 

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One thing to consider, as emissions requirements evolved, the Inline 6 was changed rather drastically, Starting in 2000 in the Wangler the exhaust ports were reduced by nearly 1/2 the size. This was meant to build up heat quicker, so as to heat up the catalytic converters faster. They also moved the location of the cat near the exhaust manifold collector. Other designs around the motor were changed to keep up with the power loss caused by the smaller ports, such as the improved intake manifold and the cam profile. In 2002 they were forced to reduce horsepower to comply with even tighter emissions regulations. This could also account for the change in transmissions, as having the right transmission behind the motor, with ideal gearing is just as important as the motor itself.
 

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I believe they were also able to use the same trans in the 4cyl & 6cyl, which makes it easier & cheaper for the factory to deal with.
 

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No, the NSG370 wasn't factory mated to the 2.4L, In jeeps it was behind the 4L and the 3.7L found in the liberty.
 

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My 2006 wrangler SE 2.4L came with the NSG 370 from the factory! And I swapped it for the NV 1500 from the 03-04 model. Best mod I've ever done.
 

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I've got the stock 3.73 gears The engine runs better it has more low end torque and it has great power on the high way Before I never used sixth gear cause it would never crank up enough rpm to be useful
 

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i think 5 speed is better for me for one simple reason, if you broke it, it's much easier the find a spare one or spare parts. coz the 6 speed was only made in 2 years
 

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I stand corrected, in 05-06 the NSG370 came behind the 2.4L, my apologies as novak-conversions didn't mention it.
 

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Discussion Starter · #15 ·
I've got the stock 3.73 gears The engine runs better it has more low end torque and it has great power on the high way Before I never used sixth gear cause it would never crank up enough rpm to be useful
I use to have that same problem where 6th gear was almost pointless until I swapped my D35 to a D44 that had 3.73 in it and made it useful I have a 4.0 tho so set up is completely different
 

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I use 6th in my 2.4. It works fine for 45-70mph on flat ground. I have 31" tires. Weren't the factory gears 4.10s?
 
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