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Unread 11-22-2012, 12:20 PM   #1
brandongeiger2
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Wrangler LJ NV3550 swap?

I'm sure yall have all seen this question before, can I swap a 5 speed manual NV3550 transmission into my 4.0 LJ with a 4 speed auto 42RLE transmission? I understand it can be done, but is it worth the time cash and effort?
So off the top of my head I'd need to buy:
-a flywheel to replace the flex plate
-different length drive shafts
-a clutch pedal assembly/master cylinder
-A transfer case or would the one that mates up with the 42RLE Work?
-shifter
-neutral safety switch?
-What electronic parts would I need?

EDIT: It has a 231J Transfer case I did a bit of research and it would mate up with the NV3550. (http://www.novak-adapt.com/knowledge/nv3550.htm)

I'm not 100% committed to this swap but if I can find all the parts I think it's worth a try, and I could make some $$$ on the old parts.

I'm sure I missed some stuff so feel free to correct me criticize or whatever it's all good!

Thanks for reading and Happy Thanksgiving!

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Last edited by brandongeiger2; 11-22-2012 at 12:45 PM..
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Unread 11-22-2012, 12:58 PM   #2
Unlimited04
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add the brake pedal assembly, a new starter and a crank position sensor.
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Unread 11-22-2012, 02:41 PM   #3
yamaha225
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I would think that if you could find another jeep in a junkyard with the parts needed it would be easier. I would def do the swap though. Manuals are much better than autos, esp that one haha.
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Unread 11-23-2012, 02:37 PM   #4
brandongeiger2
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Right I forgot crank position sensor i just threw a new one at the LJ for $15 haha but i remember seeing the sensor for the manual its like $120! Whats different about the break assembly? Is the clutch integrated with it?

I'll probably go to a junkyard for the parts it would be a hell of a lot cheaper and the 42RLE tranny does suck, that thing forgets when to shift!

Thanks for the help guys!
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Unread 11-23-2012, 02:46 PM   #5
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Originally Posted by brandongeiger2 View Post
Whats different about the break assembly? Is the clutch integrated with it?
pedals are different width. ever notice an auto pedal is double wide?
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Unread 11-23-2012, 05:08 PM   #6
rjbruzan
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A PCM or ECM for a stick shift as the check engine light will be stuck on. After all the parts and labor a new Jeep might be faster and cheaper?
Ron
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Unread 11-23-2012, 05:42 PM   #7
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Quote:
Originally Posted by Unlimited04

pedals are different width. ever notice an auto pedal is double wide?
Oh that makes sense now i feel stupid haha
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Unread 11-23-2012, 05:46 PM   #8
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Quote:
Originally Posted by rjbruzan
A PCM or ECM for a stick shift as the check engine light will be stuck on. After all the parts and labor a new Jeep might be faster and cheaper?
Ron
Maybe, at the moment its just an idea though i haven't looked at many of the prices for parts yet. It would be a fun project i think, if its more than 2 grand yeah its probably not worth the trouble or the cash though...
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Unread 11-23-2012, 06:39 PM   #9
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Originally Posted by brandongeiger2 View Post
Maybe, at the moment its just an idea though i haven't looked at many of the prices for parts yet. It would be a fun project i think, if its more than 2 grand yeah its probably not worth the trouble or the cash though...
back when I was looking into this swap very carefully a few years back, it was roughly break even between buying a used 2005 LJ Rubicon w/6-speed and NV3550 swap parts + selling 42RLE. Parts from Davey's Jeep alone came to around $2000+shipping.

the next time my 42RLE dies, I may do the manual swap...or an ATS Performance 42RLE w/ TransGo shift kit. The ATS 42RLE is pricey too.
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Unread 11-23-2012, 06:39 PM   #10
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Quote:
Originally Posted by rjbruzan View Post
A PCM or ECM for a stick shift as the check engine light will be stuck on. After all the parts and labor a new Jeep might be faster and cheaper?
Ron
IIRC LJs were never offered with the NV3550 as an option though. NSG370 yes.
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Unread 11-23-2012, 06:48 PM   #11
jrallen
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I feel like the NSG370 would be a much easier and cost-effective swap given that it was actually offered for your year model jeep. If you're dead set on a New Venture tranny though, I'd suggest the NV4550... it's very similar, but heavier duty. More worth your time, IMO.
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Unread 11-23-2012, 06:51 PM   #12
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Originally Posted by jrallen View Post
I feel like the NSG370 would be a much easier and cost-effective swap
its also interesting to note the NSG370 uses the same crank position sensor as the 42RLE. the NV3550 uses something else which is four times more expensive.
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Unread 11-23-2012, 06:57 PM   #13
brandongeiger2
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Quote:
Originally Posted by BYuen View Post
IIRC LJs were never offered with the NV3550 as an option though. NSG370 yes.
If I may cite this from Wikipedia:
But I'm not that jeep savvy haha

http://en.wikipedia.org/wiki/Jeep_Wr...gler_Unlimited
mxepn.jpg  
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Unread 11-23-2012, 06:58 PM   #14
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Quote:
Originally Posted by brandongeiger2 View Post
If I may cite this from Wikipedia:
But I'm not that jeep savvy haha
the LJ never came with a NV3550. in 2004 they only had 42RLE autos.
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Unread 11-23-2012, 07:03 PM   #15
brandongeiger2
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Quote:
Originally Posted by jrallen View Post
I feel like the NSG370 would be a much easier and cost-effective swap given that it was actually offered for your year model jeep. If you're dead set on a New Venture tranny though, I'd suggest the NV4550... it's very similar, but heavier duty. More worth your time, IMO.
Quote:
Originally Posted by Unlimited04 View Post
its also interesting to note the NSG370 uses the same crank position sensor as the 42RLE. the NV3550 uses something else which is four times more expensive.
So is the NSG370 a better transmission than the NV3550? I'm all about saving money but I know my T-case works with the NV would it be that much more economical to go with the NSG if I would need to buy a new one or one that was compatible? Than Id probably need to buy new driveshafts correct?
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