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1969 Javelin Engine Swap

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Drooque View Drop Down
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    Posted: Jun/29/2020 at 10:07pm
Hello,
I have been reading posts on this forum for years, but finally posting for the first time.
My father and I are currently working on two different AMC projects. I will ask about my Gremlin in a separate post.
His 69 Javelin has a newly rebuilt 290 and automatic transmission. Ultimately he would like more power; like to be able to drive it around town, drive it to the strip about 30 miles away, take it down the track, and drive it home. He likes the idea of a 360 or 401 with the edelbrock EFI conversion in the long run.
Tomorrow, we are going to look at a 72 Jeep J4000 with a 360. Would this be a vehicle to try to swap engines and/or transmissions and then resell the Jeep?
Thanks
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1970390amx View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Jun/29/2020 at 11:00pm
71 and older V8 engines have a different crankshaft flange. Unless both vehicles have manual transmissions trying to swap outside of the correct year set is very difficult. 72 and newer engines in jeeps untell about 1980 used a turbo 400, while cars used a torqueflite. Some a 727 or 904 type automatic. Just my 2 cents  but you would be better off just buying a 360 and a 727 and rebuilding both.
1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box
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Drooque View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Drooque Quote  Post ReplyReply Direct Link To This Post Posted: Jun/30/2020 at 11:06am
Thank You,
1. What about the 290 in the Jeep? I have gathered from reading posts that the Gen 2 engines can bolt to newer trans with a spacer/adapter.
2. What about the 360 from the Jeep in the Javelin with a different 2wd TH400? We happen to have a freshly rebuilt TH400 that was bolted to a SBC. I know there are adapters for the different bell housing bolt patterns between the different TH400.
Ideally we would like to go from 2 running vehicles to 2 running vehicles, so we can sell the donor and recoup our costs and start saving for the Edelbrock EFI.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/30/2020 at 11:18am
The crank adapter you need to put the 290 in the truck isn't available. Then there's a flywheel balance issue.
These aren't SBC's.

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Post Options Post Options   Thanks (1) Thanks(1)   Quote Mopar_guy Quote  Post ReplyReply Direct Link To This Post Posted: Jun/30/2020 at 11:40am
I don't see how you can pull this off since you're crossing the 71 crank flange boundary. To do the swap you want to do you need to find a 71 360 donor vehicle in order to put the 290 back into and bolt up. Besides that, buying adapters to do what you want gets expensive. It's a good idea in theory but it's not just an easy swap as you thought.

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mramc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mramc Quote  Post ReplyReply Direct Link To This Post Posted: Jun/30/2020 at 5:18pm
Check out the NOVAK transmission adopter web site. They have a full knowledge based web site section on engine transmission swaps. They specialize in Jeep , but it all applies to the AMC cars also. The Novak adopter web site will pretty much answer all your questions and tell you what you can and can not do. And you can do just about any thing, all it takes is cash. LRDaum 
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Post Options Post Options   Thanks (1) Thanks(1)   Quote 1982AMCConcord Quote  Post ReplyReply Direct Link To This Post Posted: Jun/30/2020 at 8:03pm
Ah...  you could use this early 304 crank in a later 360 block and get a nice 360. It's on Facebook...


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Drooque View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Drooque Quote  Post ReplyReply Direct Link To This Post Posted: Jun/30/2020 at 8:07pm
Thanks to everyone that responded. It looks like the issue isn't if it can be done, but more the cost of the adapter if you can even find one any more.
We looked at the Jeep today and it is awesome. The 360 is recently rebuilt with a performance cam, head work, edelbrock intake and carb, headers, etc. It moves real nice. I really want to justify putting the engine in the Javelin. I might bring the diagram and pictures of the adapters I found on this forum to the machine shop and ask them what they could do.
Otherwise, I might look around for a different engine for the jeep. I have a 258 I would put into it, but I don't think it would be powerful enough.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote bigbad69 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/01/2020 at 9:17am
That Jeep sounds like a keeper as is. Rather than tear it apart, why not source a 360 with an early crank, or a 343, to drop in the Javelin? It would be a bolt-in solution. The money you save on adapters could go into the engine. Depending on your budget, you could go 390/early 401, but you will pay a lot more for those engines.
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1970390amx View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Jul/01/2020 at 2:00pm
In my opinion swapping to a different engine will do damage to the relatively week trans that is behind the 290. If you need a stronger trans any upgraded engine should come with an upgraded transmission
1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box
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