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Old 11-11-2011, 01:51 PM
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1987 4.2 wrangler

Hi I'm new here and couple buddies told me about this place so I'm giving this a try, I just bought an 87 with a 4.2 the guy told me it had a rod knock but it came with another motor I did the motor swap already but I have a problem the harmonic balancer and pulley separated I'm having a hard time finding one but in the mean time I plained lifting it now I'm told the trans is to weak and the transfer case is not the 231 will the 4.0 5spd and transfer case bolt up my motor please help me out thanks

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Old 11-11-2011, 04:03 PM   #2
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Punctuation is not your strong suit.

Much more info is needed.

You're never to old to have toys!
'90 YJ, 4" RC Suspension lift, 1" Shackle lift, SYE and CV, Holley Carb, 33/12.50/15 Dynapro M/T's. RIP my old friend.
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Old 11-11-2011, 04:17 PM   #3
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Much more info is needed.[/QUOTE]
Why don't you pull the harmonic balancer off of the other engine and use it? I am assuming the transfer case you have is a NP 207. Nothing wrong with that case, just not a lot of support for it. ie parts etc. What tranny do you have?
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Old 11-12-2011, 07:29 PM   #4
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What's the transfer case got to do with lifting it?
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Old 11-17-2011, 03:11 PM
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Sorry guys I was rushing when I wrote this I'm told from different people now that they do not make a skip yoke for my transfer case no because I want to do the spring over kit and than someone told me that my trans if garbage so now I'm looking at what should I do for parts? Can I use the 4.0 trans and transfer or am I wasting my time with this jeep
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Old 11-17-2011, 03:30 PM   #6
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What?? PUNCTUATION please!!

spark notes:

Can't do t-case SYE kit.
Tranny is junk.

You can do a SYE kit on an NP231J relatively easy, LOTS of kits out there. I believe all Wranglers come with NP231J's. The Puegot tranny behind your engine is a POS though, the AX-15 is a LOT more durable.

2.5L Genius of some sort.
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Old 11-17-2011, 08:22 PM   #7
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The 87 wrangler has the NP207. It is the only year that they did that. You heard correct, a SYE kit is not available for that T-case.

Anywho InsaintyII, I believe the trans and T-case from a 4.0 will work in your Jeep. I would run your current drive train until you have a problem with it. Depending on the type of abuse you are going to subject your Jeep to it may be fine the way it is.
87 YJ, 5.7/TH350/NP241, Custom 4 link/ Radius Arms, ADS Nitrogen Shocks, 35" Cooper STT
DaddyJeep build Thread:https://www.wranglerforum.com/f8/dad...ld-122601.html
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Old 11-18-2011, 09:27 AM
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Ok thankyou, I plain going to rausch creek alot with my friends so I'm trying to build it to keep up with them.do I need any brackets to put in the 4.0 trans and transfer case in?

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