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Old February 20th, 2013, 05:19 AM   #1
Hooperdog
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Default Nv3550 / ax15

looking at a few TJ's for sale, how can I tell if it has an ax15 or a nv3550 trans? Is there a tag on them or can I tell by appearance? thanks
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Old February 20th, 2013, 07:50 AM   #2
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FYI ax-15 97 up till 2000. 2000 and up nv3550. Unless they were swapped.
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Old February 20th, 2013, 09:52 AM   #3
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^^ this

The 3550 is a little stronger and has a lower first gear. The ax 15 is more common and much easier to get parts for if you damage it.
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Old February 20th, 2013, 01:26 PM   #4
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Take a look at Novak's site for the AX15 and NV3550 for some pics and info. Easiest I know of, and I think reasonably fool proof is looking at the output shaft if its flush or not (figuring you're buying just a trans and there's not a t-case on it).

http://www.novak-adapt.com/knowledge/ax15.htm

http://www.novak-adapt.com/knowledge/nv3550.htm

NV3550: Spline count for the input shaft is 10 splines x 1-1/8" diameter. The output shaft has 23 splines and is flush with the rear face of the transfer case adapter flange.

AX15: The 4wd version of the Jeep AX15 has a 23 spline output shaft for connecting to the transfer case input shaft. This shaft protrudes about 1/2" past the rear face of the transmission.

Make sure you don't pick up an AX5, it should have 23 spline output, not 21 like on an AX-5.
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Old February 21st, 2013, 06:04 AM   #5
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thanks
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Old February 21st, 2013, 01:48 PM   #6
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An AX15 has a big ole intermediate plate sandwiched between the case halves. The NV3550 does not.
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