Swaping AX15 for an NV3550 questions - JeepForum.com
 
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post #1 of 10 Old 07-19-2004, 06:27 AM Thread Starter
nadeaujeeper
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Swaping AX15 for an NV3550 questions

I have a '94 YJ with a 4L, AX-15 tranny and a NP231 t-case.

Has anybody ever taken out an AX-15 and put in an NV3550? Is it a direct bolt on? Or do I need some special adapters?
Any help would be greatly appreciated. Thanks!

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post #2 of 10 Old 07-19-2004, 12:14 PM
Mav
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As you can read here --> click you'll need a bellhousing and slave cilinder kit if your AX15 has an internal hydraulic bearing.

If you have the external slave clilinder the 3550 is directly bolt on.

In my opinion if your AX15 isn't totally worn you'll better keep it or spend a few bucks more and replace it with an 4500.

The 3550 is a medium duty transmission and is mostly used to replace the weak BA10/15 while the 4500 is (in my opionion again) the more logical upgrade for the AX15.

Good luck with your replacement

1998 ZJ | Still stock



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post #3 of 10 Old 07-19-2004, 02:23 PM
tobias94yj
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I have to disagree with you mav. everything I have ever read is that the torq and hp ratings on the nv3550 are very modest and can handle quite a bit more than that. I believe those tranny's are used behind v-8 dakotas. I think that they are alot better than the ax-15 but would spend that kind of money on them unless my ax-15 was completely demolished. the nv4500 is a bulletproof tranny and if you are spending alot of money i would look into one of those. alot of times you can find one used alot cheaper than a nv 3550.

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post #4 of 10 Old 07-20-2004, 11:57 PM Thread Starter
nadeaujeeper
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Thanks tobias94yj for your help. I also read somewhere that the NV3550 was a little stronger tranny then the AX-15. I'll keep doing some research before I do anything.
My tranny is out of my Jeep and all apart, but we can't find why it is howwwling so much. It howl's even when my Jeep engine is turned off, tranny in first or reverse and coasting down the hill or someone pushing it with the clutch pressed in all the way.

'94YJ, 4L, 5 speed std, 3.5" Black Diamond suspension, 4.10's, rear Detroit Locker, 33X12.5R15MT/R's, 6"Xenon TJ flares, Durango 4X4 Tire carrier & trail rack, 9000 Warn winch, No sway bars & no track bars, York OBA coming soon
Home made stuff: 1"body, 1.5"MM lift, rocker rails, belly up kid, center console, hand throttle
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post #5 of 10 Old 07-21-2004, 12:49 AM
cjb7804
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I just did the 3550 upgrade, but mine was from a BA/10. So far I like the new tranny, but again it was upgraded from the BA/10 not the AX15. From everything I've read from the internet and Advanced Adaptors, the 3550 is just a little stronger than the AX15, plus a little better gear ratios. If I had the AX15 and it went out, I don't think I would spend the extra money for the 3550, just because the difference is so marginal. The wine your getting almost sounds like your getting play in your input shaft/gears, but not a 100% for sure on it. Hopefully this info is helpful. Also for your info, I got my complete kit from Advanced Adaptors, and they have a kit for the AX15/NP231 so you can take a look on there website and see what you think.
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post #6 of 10 Old 07-21-2004, 03:09 AM
tobias94yj
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oh and nadeau you have an external slave cylinder. I just noticed on mav's post he said " if you have an internal slave" but 94's and 95's have an external slave.

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post #7 of 10 Old 07-21-2004, 06:22 AM
johnny1720
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I swapped out my junk AX15 for the NV3550. Previous to that I had the AX15 rebuilt about 3 times. I put it in my 92 YJ and it was an easy swap after I found a bellhousing.

The price wasnt bad either, i picked up a brand new NV3550 from ebay for about 750 and had it shipped to me. I think I had less than 1200 in the entire swap and I did all the work myself except the turning of the flywheel.


I had considered the NV4500 but the adapter was around 300 and I didnt at the time want to change my driveshafts. Which I eventually did anyways.

good luck with your choice, and I love my NV3550

johnny

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post #8 of 10 Old 07-21-2004, 06:35 AM
CAJUN_YJ
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ax-15

I'm in the process of rebuilding my ax-15 my self for around $165.0! I had about 95000 miles on it and thats not to bad. I purchased the jeep from a guy about 3 months ago knowing of the problem. I believe that it has a lot to do with the driving habits of the owner. I have a good friend who jams the ax-15 into 2nd and than cries about it not holding up. Lets face it, its made in japan and the japs make good stuff, my 88 toyota 4x4 runs basicly the same trans and has about 150000 on the tranny and runs fantastic.
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post #9 of 10 Old 07-21-2004, 08:07 AM
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CAJUN where did you get the rebuild kit from for $165? I may be looking at rebuilding my AX-15 (metal shavings in the oil, more than normal). So far has it been a tough go? Anything that a person should be aware of before tackling this project?

Sorry, didn't mean to hijack this thread!
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post #10 of 10 Old 07-21-2004, 11:24 AM
CAJUN_YJ
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Quote:
Originally Posted by SteelKJ
CAJUN where did you get the rebuild kit from for $165? I may be looking at rebuilding my AX-15 (metal shavings in the oil, more than normal). So far has it been a tough go? Anything that a person should be aware of before tackling this project?

Sorry, didn't mean to hijack this thread!
no, it's not that hard, www.bayougeep.com
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