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Old 02-04-2008, 06:52 PM   #1
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AX-15 to a NV3550

I haven't had 3rd gear in 6 months and 5th came apart on Friday. Keep in mind I submurge and mud mine and it does not lead an easy life. I even twisted the spline on my driveshaft recently. So I am looking to upgrade on a budget. I have found a NV3550 out of a 2002 TJ with 30,000 miles on it. I know AX-15's have an issue with 3rd gear in high mileage, and everytime 3rd is where my problem has started. Anyone else running NV3550 or knows of problems?

Rig is a 93 YJ stick shift with a 4.0 and a NP231 transfer case.

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Old 02-23-2008, 09:54 PM   #2
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Update---The NV3550 is in! It does bolt right up to the bellhousing and transfer case. Now for the problems, the AX-15 has a spot where your shifting linkage off of the transfer case mounts and the 4WD shifter comes up and through the floor that the NV3550 does not. I am now having a TJ transfer case shifter installed in my YJ also. The slave cylinder will now be external which is a nice feature but, the master cylinder from the NV3550 will not fit where the old one was under the hood. We will try using the smaller one from the AX-15 and see if that will work okay. I still have a couple odds and ends (bracket pieces) on order for the shift linkage but wanted to give an update. I am having this done by a Jeep mod shop and it is a learning experience for him. This is NOT an easy swap.

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Old 03-03-2008, 08:43 PM   #3
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Finally drove my Jeep home today and all is great in the world again I have a TJ shifter mounted further forward than the YJ shifter was and that looks very weird. Everything is shifting nice and smooth and I can't wait to test wheel it. This design is definately more waterproof than the AX-15 and based on my wheeling that is a major plus.
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Old 03-04-2008, 07:56 PM   #4
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Ah, yes, this is any easy swap. You needed to buy the T/C shifter bracket for about $40 that would have allowed you to use you original T/C shifter. You use your old clutch master cylinder and buy an adapter fluid line that hooks up to your old m/c and the new NV3550 slave cylinder. There is also an adapter to use the old transmission mount with the new trans. But, if you got it all working, good on you.
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Old 03-04-2008, 08:07 PM   #5
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Used the old master cylinder and found some line that worked, no problems there. Where were you when I posted up originally asking what would be involved in doing this
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Old 03-05-2008, 11:27 AM   #6
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It's a great transmission for jeeps really strong. I misunderstood your first post, I thought you were asking about problems installing the trans, there's no problems, it's all been worked out by others, not me. I put one in my 87 with a 2004 T/C and bought all the parts needed from Man-trans, right there in FLA. Went in like a dream. Sorry about misunderstanding what you were asking.
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Old 03-05-2008, 07:59 PM   #7
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Where could I have found the adapter bracket to still use my YJ shifter? We did some searching online with advanced adapters and Man-tran with no luck.
Just incase something ends up not working out with the current setup, test wheelin this weekend. Thanks
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Old 03-05-2008, 11:19 PM   #8
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I bought mine from Man-Trans, but, it was drop ship from I think Advanced Adapters. I would have no idea why they told you they do not make the adapter. I'm running one in my jeep, along with fluid line, pilot shaft bushing, trans mount adapter and something else. I bought all the part seperately and not as a kit, it was cheaper that way but all from Man-Tran. Someone gave you some bad information. The T/C shifter bracket mounts on the t/c bolts and you bolt your old shift lever to it.

But, when I told them I was putting in a 2004 TJ T/C I was told it would not work and they would not sell me the parts, because I would just be sending them back and they didn't want to deal with a return. So, I call them back and told them I had an old YJ t/c and they sold me the parts and I use the 2004 t/c without any issues at all. So, maybe that's the reason or something similiar why they wouldn't sell you the parts. I never ran across that with a supplier before. Advanced Adapters told me the same thing. Strange people I guess.
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Old 03-06-2008, 09:48 PM   #9
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I don't know, maybe that was the issue with them. I kept my original transfer case and only changed the Transmission. Thanks for the reply.

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