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Old 04-14-2014, 10:39 PM
Arkansan Gladiator Arkansan Gladiator is offline
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'66 Gladiator (AMC) 327 w/th400 swap for 360

Hello everyone, I've scoured the internet and the forum and can't seem to find the answer I'm looking for; my 327 is locked up and I don't have the money to spare for a rebuild right now, but a friend has a later model 360. From what I've read, I don't think that motor will bolt up to my nailhead TH400 and adapter plate. My friend has a t18 with his motor and said I could take the bellhousing if I needed it, but will that even work with my TH400? Im new to these jeeps and get lost with all the different manufacturers parts on these trucks, so I was hoping someone could steer me in the right direction. Just to recap. I want to keep my TH400 and use a later model 360 in the place of my 327. Before everyone tells me how great the 327 is, I understand, but it is a pricey rebuild and the 360 only has roughly 50,000 miles on it and costs essentially no money. I plan to rebuild the 327 later on when the funds are available. Any help is appreciated.
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Old 04-14-2014, 11:27 PM
joe joe is offline
 
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If you want to keep your trans you'll need the nailhead to AMC adapter ring and a 360 flexplate. The nailhead/360 ring was used between 71-73. Weren't used for many years but there were a lot of them produced. In 74 the th400 cases were drilled with the AMC pattern.
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Old 04-15-2014, 08:24 AM
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tgreese tgreese is offline
 
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Isn't there a crank pilot bushing for the nailhead 360 setup too?

As joe described, there is an adapter ring between your current transmission and the engine. Until 1974-ish, all automatic Jeeps used this type of setup, with the adapter ring. You can get an adapter ring to fit the 360, but I expect you will have difficulty sourcing all the parts you will need. The torque convertor and flex plate is also different from the 327 and from post-74-ish applications, and there is no aftermarket source, AFAIK.

The usual solution for this is to get a 74-ish and later Jeep TH400 and use the newer transmission case. Most of the Jeeps with this case had the QUadratrac transfer case, so you'd need to use the output shaft and adapter from your current transmission with the newer case. Then it would bolt up to the 360, and you could buy a new converter and flex plate.

What's wrong with the 327? I suspect that fixing up the 327 is going to be cheaper in the long run, even with the high parts prices. Costs for a swap add up, and the 360 won't be a simple bolt-in.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
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Old 04-15-2014, 09:14 AM
joe joe is offline
 
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Quote:
Originally Posted by tgreese
Isn't there a crank pilot bushing for the nailhead 360 setup too?

Yup., all the th400/360 combos require the pilot bushing. I think oldcarparts.com still carries them? I believe it's p/n 80002
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Old 04-15-2014, 09:38 AM
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Mikel Mikel is offline
 
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Quote:
Originally Posted by tgreese
Isn't there a crank pilot bushing for the nailhead 360 setup too?

As joe described, there is an adapter ring between your current transmission and the engine. Until 1974-ish, all automatic Jeeps used this type of setup, with the adapter ring. You can get an adapter ring to fit the 360, but I expect you will have difficulty sourcing all the parts you will need. The torque convertor and flex plate is also different from the 327 and from post-74-ish applications, and there is no aftermarket source, AFAIK.

The usual solution for this is to get a 74-ish and later Jeep TH400 and use the newer transmission case. Most of the Jeeps with this case had the QUadratrac transfer case, so you'd need to use the output shaft and adapter from your current transmission with the newer case. Then it would bolt up to the 360, and you could buy a new converter and flex plate.

What's wrong with the 327? I suspect that fixing up the 327 is going to be cheaper in the long run, even with the high parts prices. Costs for a swap add up, and the 360 won't be a simple bolt-in.

I agree on fixing the 327. They are very cool motors. Sell the 360 and pour the money into the 327.
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Last edited by Mikel : 04-15-2014 at 10:09 AM.
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Old 04-15-2014, 09:23 PM
Arkansan Gladiator Arkansan Gladiator is offline
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The 327 is severely locked up. I've tried all the redneck tricks and have had marvel mystery oil sitting in the cylinders for over a month and I still can't turn the crankshaft. I'm going to keep the 327 and rebuild it later, but I suspect it will need a full rebuild kit and the prices I'm seeing are around $1300, and that doesn't include any machining or any other snags in the build. Not to mention; I've never rebuilt a motor before, so I'm just not interested in rebuilding the 327 right now.

So there is a different adapter ring for the 360 than the 327? Or I can find a post '74 TH400 drilled from the factory for an AMC360? I'm thinking you're right about the conversion; it may cost just as much to retrofit the 360 as it would to rebuild the 327. Which leads me to my next thought; I could just swap the engine and trans out for a small block 350/th400. I'm gonna dig in the forums and see what I can find out...
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Old 04-15-2014, 09:39 PM
joe joe is offline
 
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Quote:
Originally Posted by Arkansan Gladiator
So there is a different adapter ring for the 360 than the 327? Or I can find a post '74 TH400 drilled from the factory for an AMC360?
Yes and yes. On the later plan the cases were drilled with the AMC pattern from 74-79. Prior to 74 an adapter ring was used and after 79 AMC switched to an AMC patterned Chryco 727 trans which won't work for you.
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Old 04-16-2014, 07:46 AM
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Mikel Mikel is offline
 
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How about getting another 327? If you can find one they aren't expensive and will drop right in.

There is something inherently wrong with replacing a 327 with a 360
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Old 04-16-2014, 08:54 AM
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tgreese tgreese is offline
 
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Yep, looking for another AMC 327 is a good plan. Even if you have to go a ways to get it, they are not in great demand. They are a very sturdy and durable engine, and if you can find one that wasn't run out of oil or whatever, it should do well for you.

Start with the WTB forums here and at FSJN, look at car-part.com for all the AMC and Jeep applications, maybe try on the AMC forums? (though I hear they value these engines a lot higher than us Jeep people do).

You can also go with the SBC/TH400, but you'll need to thake the Chevy TH400 completely apart and reassemble it woth your Jeep output shaft.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
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Last edited by tgreese : 04-16-2014 at 09:04 AM.
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  #10  
Old 04-16-2014, 10:26 AM
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FSJunkie FSJunkie is offline
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Rebuilding a 327 from a seized hulk can be upwards of $3000 if you have the machine shop do it as a long block. I know, I've done two of them.

I've also taken a vehicle that originally had a 327, was converted to a 360, then I converted it back to 327.

A 360 will bolt in with a different transmission adapter, flexplate, and motor mounts. Notice I said bolt in, not run. You need an external starter relay setup, different exhaust system, and of course all the accessories that go with a 360. Power steering pumps, alternators, bracketry, etc. is all different. And I'll tell you from experience, trying to piece together all the external engine brackets and accessories is what drives up the cost REALLY fast. Nuts, bolts, washers, hardware...they add up.

So...you might be able to pick up a 360 for cheap, but actually getting everything bolted up and functioning will be what drives costs, and by the time you go through all, It might have been cheaper to either rebuild your existing 327 or find another and drop it in.

Nashes, Ramblers, and Hudsons used the 327 from 1957 to 1966. There was also a 287 from 1961-1966 and a 250 from 1956-196?. All the same block and same basic parts.
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  #11  
Old 04-16-2014, 11:01 AM
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44BZ 44BZ is offline
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I was in a similar position a couple years ago. I replaced the timing set in my 327 and forgot to torque the cam gear bolt. Upon start up, the bolt backed out and bound up against the timing cover. Needless to say, the oil pan filled with metal bits and my 327 was dead. I considered a rebuild, contacted a local shop, and quoted in the neighborhood of $3k. There was no way I could do that. In 5 or 6 months time, only one 327 popped up near me and it was in a non-running Wagoneer. I went to look at it, but passed. The seller ended up giving my name and number to another guy who was looking to replace his 327 with a Chevy motor. The guy called me and $200 later I had a running AMC327 to replace my broken one and it's still goin strong.

All that to say, start watching Craigslist and post in the wanted section on the AMC forums. Be patient, they do pop up and they're cheap when they do...
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Old 04-17-2014, 07:30 PM
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Carnuck Carnuck is offline
 
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This is everything you need to get for your swap. I got them to put the 290 I have in my '68 Travelall.

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