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Unread 10-19-2011, 11:09 AM   #1
David2012
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1985 CJ7 
 
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Engine swap time

I have a 1985 cj7 with a 4speed transmission and a 4cyl engine. I was wondering what transmission and tcase i might have. Im looking to do an engine swap with a 1993 yj 6cyl with an ax15 transmission. If anyone knows what i should look out for, wether or not its a direct bolt up, if im going to need an adapter kit for the transmission or anything that might be useful I would appreciate it.

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Unread 10-19-2011, 11:13 AM   #2
CSP
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The engine is a bolt in with the right parts (six cyl motor mounts). The EFI system is a completely different story. You'll need to do a lot of research for that part. It's completely doable, but requires some education.
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Unread 10-19-2011, 11:27 AM   #3
David2012
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do you think my trans will work with no modifications with the 6cyl yj enigne? Would completely eliminating the efi by using the yj exhaust system potentially work? Thanks for your input, anything helps.
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Unread 10-19-2011, 11:53 AM   #4
CSP
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The trans you have won't work with the 6cyl.

EFI means electronic fuel injection. The YJ exhaust has little to do with it.
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Unread 10-19-2011, 08:28 PM   #5
David2012
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oh haha my bad. I was thinking EGR. My buddy says (he has a totalled yj, the doner) that all we need to do is switch out the computer and the engine and that sohuld be that. we are also going to completely redo the exhaust to remove the EGR. Do you know what the "part" is called that adapts the trans i have to the engine? Im sorry if i sound ignorant. That would be because when it comes to mechanics i somewhat am. Im new at this and im hungry for knowledge.
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Unread 10-19-2011, 09:54 PM   #6
mopar346
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Welcome to the forum, I get down to Orlando regular enough, every EGR valve I have ever seen attaches to the intake manifold, so still confused about the exhaust question. The part that attaches the engine to the trans is called the bell housing. Study the Novak site, it's a great resource for engine swaps.

http://www.novak-adapt.com/knowledge/gearing.htm
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Unread 10-19-2011, 10:09 PM   #7
Stumpbumper
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Yep Novak!
The 4.0 EFI has a crank sensor on the flywheel. You can drill he bell and install it or buy the adapter for it!
The AX15 will not bolt Directly to the D300 transfer if you decide to go that direction.
And the NP231 from the YJ is drivers drop and not passenger like the D300. Just a little info!
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Unread 10-19-2011, 10:32 PM   #8
David2012
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for as far as i can tell the trans i have, the t-4, is said to be "too weak" for an engine swap. is this true? or am i just looking at novak incorrectly?
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Unread 10-19-2011, 11:12 PM   #9
David2012
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if the engine im getting is combined with the ax15 and the ax15 has the same spline set-up as the t4 wouldnt it just be a direct bolt up? the ax15 is 23 sokine with 7-1/2inch input and 1-1/8inch x 10 splines. same as the t4. does this mean that they are interchangeable? i know the t4 is a very weak trans..
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Unread 10-19-2011, 11:45 PM   #10
RenoF250
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Quote:
Originally Posted by David2012 View Post
if the engine im getting is combined with the ax15 and the ax15 has the same spline set-up as the t4 wouldnt it just be a direct bolt up? the ax15 is 23 sokine with 7-1/2inch input and 1-1/8inch x 10 splines. same as the t4. does this mean that they are interchangeable? i know the t4 is a very weak trans..
You can and probably should use the AX15 but you will need an adapter to use the D300 in the CJ:
http://www.novak-adapt.com/catalog/kit_153.htm

I believe that since the AX15 is a different length you will probably also need to get your driveshafts lengthened/shortened.
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Unread 10-20-2011, 12:07 AM   #11
1986cj
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The AX15 has its own bellhousing and will not bolt up to a T4/T5/SR4. Your 4 cylinder bellhousing will not fit a 4.0 or a 258 6 cylinder. If you have the choice use the AX15 as it is a much stronger 5 speed transmission. Your Dana 300 will fit the AX15 with a simple clocking ring to make it a passenger side drop for a CJ. I still don't understand why anyone would ditch a egr valve.
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