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  #1  
Old 02-29-2008, 01:02 PM
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Grantshire Grantshire is offline
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Any NV3550 or AX15 swappers out there?

There are plenty of write-ups and information on NV4500 swaps but I am curious if anyone has swapped a NV3550 or AX15 into a FSJ. In particular, has someone put either of these medium duty 5-speeds behind an AMC V8? If you have, would mind posting up some details and a picture of your shifter? Also, what transfer case did you go with?

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  #2  
Old 02-29-2008, 02:19 PM
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Cecil14 Cecil14 is offline
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I intend on putting at least an AX-15 (NV3550 if I can find one) in my J-10 behind the stroker for at least next winter. They're not as beefy as the NV4500, of course, but the NV3550 was used in Dakota V8s if I'm not mistaken. They should hold up alright. I wouldn't try dragging any semis around, though.



aa
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1983 J-10 - 4.6L(MPFI)/CS130D/Hydroboost/NV3550/D300/44/44/3.54/Disc-Disc/32s/42 gallon 'burb tank
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  #3  
Old 02-29-2008, 04:01 PM
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Billygoat Billygoat is offline
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I have a 3550 in my garage waiting warmer weather - going behind a 360, and mated to a 300 tcase

Look for a 2001 Cherokee with a 4.0 and manual - the NV3550 has a different output bolt pattern, but other wise the same - less commom but I got 1 with 23k on it for half what they wanted for a Wrangler 1 with 45k.

Also if you can score the bellhousing it will bolt right to your block, just need the correct pilot brg and clutch disk.
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  #4  
Old 02-29-2008, 04:11 PM
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Cecil14 Cecil14 is offline
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The output bolt pattern should be the same, it's just the standard round NP 6 bolt pattern. The clocking on it may well be different, though.


aa
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1983 J-10 - 4.6L(MPFI)/CS130D/Hydroboost/NV3550/D300/44/44/3.54/Disc-Disc/32s/42 gallon 'burb tank
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  #5  
Old 02-29-2008, 10:15 PM
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Planing on a 4.0+NSG370(six speed) + Dana 300 swap this summer (Get that up and going before the 4.6 stroker swap)
From what I understand you may or may not need to swap the D-300 input shaft and a clocking ring is needed.

(Hopefully BJ's can fix me up on the tranny to T-case stuff when I figure out exactly what is needed)

the 3550 has a good rep. i will see how the NSG holds up. If it toasts then I will go to the 3550.

Mike D.
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  #6  
Old 03-01-2008, 10:07 AM
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JeepsAndGuns JeepsAndGuns is offline
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Quote:
Originally Posted by Cecil14
The output bolt pattern should be the same, it's just the standard round NP 6 bolt pattern. The clocking on it may well be different, though.


aa

Correct. The bolt pattern is the same between the wrangler and cherokee, just the cherokee version has a slightly diffrent clocking.
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
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  #7  
Old 03-04-2008, 08:41 AM
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Okay, the AX15 5 speed has been around since the late 80's and is a relatively easy swap behind a Jeep engine. That's almost 20 years but I have never seen or read of one swapped into a FSJ (or a NV3550 swap). Why not? Can't be strength, both are considerably stronger than the T5 and T176/177 Jeep put in some of the FSJ's.

"Use a NV4500." A lot of us have this transmission and love it (got one in my M715 behind a 6.2 diesel). But its not the best 5 speed for all applications. If your axles are geared low the NV4500's granny low is worthless for a DD. That leaves you with a 3 speed transmission with overdrive.

Considering how long the AX15 and NV3550 have been around isn't there someone in FSJ land that has first hand experience with one of these swaps?
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  #8  
Old 03-04-2008, 09:14 AM
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Cecil14 Cecil14 is offline
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I would guess strength to be the big issue. When you come down to it even the NV4500 really isn't anywhere near as beefy as the old granny 4 speeds. Yah, the AX-15/NV3550 are worlds ahead of the T-5 and T-176, but they still don't compare to a T-18 or an SM465.

I'm going to run one just because they're loads cheaper than an NV4500 and like you say, a lot more "rounded" as an all around driver. I don't tow all that much with my truck, I'm going for more fun to drive than anything else. The T-18, while ungodly strong, is absolutely painful to drive.


aa
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  #9  
Old 03-04-2008, 09:41 AM
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You cannot use a v8 flywheel with this swap.
The v8 flywheel protrudes farther off the block and interferes with the throwout bearing.
You need to use the 4.0/4.2 flywheel and have it rebalanced to the v8.
Its a simple match balance. Nothing to it.
After that you will need to use the 4.0 mitsu starter unless your v8 already uses one (88+). The 88+ v8 and 4.0 use the same part number for the starter.

The other thing to consider is that unlike an nv4500 swap, you must convert to a hydraulic clutch setup so hydroboost will be in your future.

kris.
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AX-15 swap info threads...
http://www.ifsja.org/forums/vb/showthread.php?t=83102
http://www.ifsja.org/forums/vb/showthread.php?t=97262
http://www.ifsja.org/forums/vb/showthread.php?t=104163
Theres more but that should get you started

Quote:
Originally Posted by JeepinPete
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  #10  
Old 03-04-2008, 02:26 PM
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Greg Taylor Greg Taylor is offline
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Quote:
Originally Posted by Cecil14
I intend on putting at least an AX-15 (NV3550 if I can find one) in my J-10 behind the stroker for at least next winter.


Hi Anthony,
Would you mind if I stop by sometime and look at your set up? I have been mildly considering swapping the entire TF727 & NP228 from my 1989 Grand Wagoneer, while I have the engine out for the 304 V8 stroker build, and swapping in a 5-speed AX15 or NV3550 or possibly to a T18/NP208 set up.

I’d be interested in seeing the set up in you J-truck. What’s in it right now?
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  #11  
Old 03-04-2008, 02:34 PM
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Cecil14 Cecil14 is offline
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Hey Greg,

Yah, you're more than welcome to stop by. Only problem is I don't have an AX-15 just yet. LOL I've got a D300 that I had behind a T-5 a while back. Right now I'm running a T-18/D20.

I have already switched over to the 4.0L flywheel and starter. Hard lesson learned there. lol I'd like to switch to the AX-15 at the same time I do the 4.0L FI. Then I could just run the CPS in that bellhousing.

Ok, hijack over.
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  #12  
Old 03-04-2008, 02:40 PM
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Billygoat Billygoat is offline
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Quote:
Originally Posted by Kris
You cannot use a v8 flywheel with this swap.
The v8 flywheel protrudes farther off the block and interferes with the throwout bearing.
You need to use the 4.0/4.2 flywheel and have it rebalanced to the v8.
Its a simple match balance. Nothing to it.
After that you will need to use the 4.0 mitsu starter unless your v8 already uses one (88+). The 88+ v8 and 4.0 use the same part number for the starter.

The other thing to consider is that unlike an nv4500 swap, you must convert to a hydraulic clutch setup so hydroboost will be in your future.

kris.


WHOA!!!!! I talked to 3 big conversion kit shops and not 1 said anything about the flywheel with a 3550 or 4500 swap...where did you get this info?

As far as hydralic that is a maybe....there are kits to hook a 3550 to a T176 bellhousing and retain your factory mechanical linkage.
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  #13  
Old 03-04-2008, 03:00 PM
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Cecil14 Cecil14 is offline
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If you run the factory 4.0L hydraulic clutch then you'll need to run the 4.0L flywheel. A hydraulic clutch doesn't have near as much play as a mechanical one and is more sensative to change.


aa
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  #14  
Old 03-04-2008, 04:25 PM
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Billygoat Billygoat is offline
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I called Novak, and they were confused never heard or such a thing, said you HAVE to use a 360 Flywheel on a 360 Engine.

I am just trying to make sure I have all my ducks in a row before I start my project...........
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  #15  
Old 03-04-2008, 04:30 PM
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Cecil14 Cecil14 is offline
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No you don't HAVE to use a 360 flywheel on a 360. All the AMC flywheels (Gen III V8s and L6s that is) are indexed the same. The problem is that the V8s are externally balanced, meaning the flywheel has to be balanced for the 360. If you take an L6 flywheel (neutrally balanced to start with) and your 360 flywheel to a speed shop they can match balance them. Now you can run your 4.0L flywheel on your 360.


aa
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  #16  
Old 03-04-2008, 04:34 PM
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Kris Kris is offline
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Quote:
Originally Posted by Billygoat
WHOA!!!!! I talked to 3 big conversion kit shops and not 1 said anything about the flywheel with a 3550 or 4500 swap...where did you get this info?
As far as hydralic that is a maybe....there are kits to hook a 3550 to a T176 bellhousing and retain your factory mechanical linkage.


If you are talking about the Advance kit, its more than twice the price I have into my trans and flywheel. Seems like its easier to use off the shelf factory parts. Not to mention cheaper.

I got this info from the 1992 ax15 with the flywheel, clutch and motor it came from sitting in my garage comparing it to the v8 flywheel and clutch also sitting in my garage.
There is no factory manual linkage bellhousing for these transmissions behind an AMC motor. The yj/tj/xj's they were offered in only used a hydraulic setup. The ax-15 from a jeep was only used behind an I-6 and the flywheel depth into the bellhousing is different than a v8. This is the height difference between the crank flange and the disk surface. If you use a v8 flywheel in the ax bell you will come up against the throwout bearing. It doesnt cost much to match balance a flywheel, so its not a big issue. Just someting you need to keep in mind when collecting parts.

If you have to keep your manual clutch, then you will need to buy the adapter and you can use the v8 flywheel. If you want a hydro, keep the stock bell, spend the money on the hydro clutch components and hydroboost brakes. Its about an even cost.

By the way...
The ax15 offered in the little jeeps was rated to around 300lb/ft of input torque. It is stronger than people give it credit for. They are also dirt cheap. They go anywhere from 100-300 used so if you did blow one up its not a big deal. The jeep 3550 is as strong as the ax15, but they are not as readily available or as cheap as the ax15.

kris.
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Save the Hammers<--Click it!

AX-15 swap info threads...
http://www.ifsja.org/forums/vb/showthread.php?t=83102
http://www.ifsja.org/forums/vb/showthread.php?t=97262
http://www.ifsja.org/forums/vb/showthread.php?t=104163
Theres more but that should get you started

Quote:
Originally Posted by JeepinPete
-If it wasn't for bad luck, you wouldn't have any luck at all-
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  #17  
Old 03-04-2008, 04:59 PM
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Grantshire Grantshire is offline
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Quote:
Originally Posted by Cecil14
If you run the factory 4.0L hydraulic clutch then you'll need to run the 4.0L flywheel. A hydraulic clutch doesn't have near as much play as a mechanical one and is more sensative to change.


aa

Agreed, but some of us have more years on the mechanical clutch setups and like them (all but my DD have carbs too).

I think I have had a Jeep with about every manual transmission they made during my life. I like the T18 but it's really just a T15 with a stump pulling gear. My preference for towing is an automatic but for shear shifting/rowing gears the AX15 is nice. I have long since learned not to use the stupid pedal too much and treat whatever transmission is in the vehicle as gently as possible.
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  #18  
Old 03-04-2008, 05:07 PM
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Billygoat Billygoat is offline
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Novak says that my 360 fly wheel will work fine with my NV3550 and it's bell housing from a 2001 cherokee. Yes I need to swap to a hyd clutch. I can get the complete setup (master, slave and hose) from Rock Auto for $130.
I should note that my swap is in a CJ8, and I am going to "cheat" and take the body off so it is easier to work on. (along with other work I am doing)
(hmmm maybe that changes the flywheel issue?? - duh me)
Best I can tell from crawling under my truck the 3550 bell is 1" shorter than my T176...and roughing the clutch linkage it dims, it does look like a bolt in swap....but then again it is not super accurate messurments on the truck side.
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  #19  
Old 03-04-2008, 05:37 PM
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Cecil14 Cecil14 is offline
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The original flywheel sticks out a good 1/4" or more from the engine than the 4.0L/mitsu style flywheel. I can't really comment on the interference of the factory slave but could definitely see it hitting.

Personally I'm gonna run the 4.0L flywheel just so I've got the tone ring. If you're going to run the NV3550 it's already got the boss in it for the CPS. Now you're ready for FI.


aa
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1983 J-10 - 4.6L(MPFI)/CS130D/Hydroboost/NV3550/D300/44/44/3.54/Disc-Disc/32s/42 gallon 'burb tank
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  #20  
Old 03-04-2008, 08:21 PM
JMAC_crawler JMAC_crawler is offline
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I personally would not throw an AX-15 behind anything bigger than a 4.0/4.2 if the rig will be wheeled often. The one in my wrangler was in good shifting shape (114k street miles) when I bought it, but after wheeling it moderately on 32s six times over the span of a year it was toast. At first I couldn't downshift into third, then both second and third wouldn't go into gear. In the process of swapping a T-18a in.

But if this is a street mostly rig that doesn't hit rocky trails often you could probably baby it along for a while.
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