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Old 07-15-2007, 01:56 PM
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amc 304 Bolt up

Was wondering what transmissions will bolt up to my 304 with no after market adapters just stock. Thanx

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Old 07-15-2007, 02:21 PM
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Just AMC............................the automatics were mostly Torqueflites (Chrysler) with an AMC boltpattern.
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Old 07-15-2007, 02:38 PM
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the transmission dont have to be amc. Right now i got a gm th400 turbo. I'm just wondering if anyone knew what or have hook to a 304,360, or 401, seen as the blocks are the same.
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Old 07-15-2007, 03:00 PM
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Unless you use an adapter, you are stuck with an AMC tranny...........not a bad thing. The bolt pattern has to fit and you did state no adapters. THere were some GM trannys used by AMC too, but they would have been put in a case that had the AMC pattern. One from a Chevy or BOP won't fit.
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Old 07-15-2007, 03:02 PM
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Someone told me a 727 would bolt right up. Is that true?
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Old 07-15-2007, 03:05 PM
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If its one that was in an AMC...............
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Old 07-15-2007, 03:15 PM
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it's in a old blazer or suburban with a 350 in it. The guy said for what year it is it would bolt up.
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Old 07-15-2007, 03:33 PM
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lets see if I can help clear up this;

a trans behind a 350 chevy motor will not bolt up to an AMC engine...

You need a trans with the AMC bell housing bolt pattern. It does not matter if it is a GM trans or Mopar trans , but it must have the AMC bell housing design to fit the 304 motor without an adapter.

Jeeps had t-400 trans in them years ago.... with an AMC bell housing design for the Jeep engine

Postal Jeeps used a Mopar trans with a chevy bell housing on them behind the GM engine.

You must have the bell housing design to fit the 304 AMC engine you said you have.

Do you have the AMC engine? Lok at the bell housing shape for a guide for what you need.
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Old 07-15-2007, 03:43 PM
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Thats what i have now is a th400 turbo. So it looks like i should just stay with that. What would anyone suggest for a transfer case. Right now it has the quadratrac but i really dont want to run all wheel drive 24/7. I will be driving daily and hitting the trails when ever i can.
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Old 07-15-2007, 04:26 PM
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The quadratrac (borg Warner 1339) is a good case. Mile Marker makes a part time kit for it available from 4wheel parts warehouses and even Autozone. With the PT kit, you can use regular ATF as well, no need for special quadratrac fluid (which is not the same as limited slip additive). The only downside to the QT is that all the drive energy goes through the chain, regardless of what range or mode it is in. BUT the chain is plenty strong, you'll break an output shaft before you break the chain, but since it's always working, it stretches faster than the chains in other t-cases. For the advantages the QT offers though, I think it's worth the extra maintenance of replacing the chain every 50,000 miles.

As for the automatic transmissions that will bolt up to your engine, only an AMC th400, AMC TF727, and a Buick Nailhead TH400 was original equipment. The nailhead was used in the late 60s with a factory 1" adapter plate and 1" flexplate spacer. This is because AMC used Buick "Dauntless" 350ci engines in Jeeps during the 60s, so the nailhead bolt pattern worked. When AMC switched to the GEN II AMC V-8s, they had a proprietary bellhousing bolt pattern and it took GM (still their supplier for automatic transmissions) a few years to start manufacturing transmission cases to match the AMC pattern. If you put your AMC TH400 next to one out of a GM car or truck, you will see there is a BIG difference. The AMC bellhousing is nice and round, the GM is shaped like a house.

In 1980 AMC switched Jeeps over to the TF727, since they'd already been using the TF904 in their cars for nearly a decade, these transmissions also have the proprietary AMC bellhousing bolt pattern, and even thouugh they are a Chrysler product, they will not bolt to any Chrysler engine, and vise versa.

AMCs are orphans and bastards in the car world. The culmination of the demise of Willys, Kaiser, Hudson, Packard, Nash and Rambler. They used any parts they could get their hands on to keep their product moving, and even when they were one of the "Big Four" they were still the underdog, so it's not suprising that some guy with an old blazer would figure that the trans in it would fit an AMC. However, I'm a little bothered that his (Chevy) Blazer or Suburban has a (Chrysler) TF727 in it though...
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Old 07-15-2007, 04:57 PM
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Just want to say thanks your information helped me out alot. This site is great and will help with as many peoples questions that i can. Thanks again
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Old 07-16-2007, 12:07 PM
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Assuming the AMC six pattern is the same as the Jeep 4.0 pattern, the AX4 auto (i6 XJ/MJ) should bolt up, they last almost forever behind the sixers, and should with a lower-power/stockish 304. I'd install a nice tranny cooler with a v8 up front or any trail/towing use.
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Old 08-02-2007, 06:03 PM
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AMC didn't make Jeeps before 1971. AMC bought Jeep from Kaiser Industries in mid 1970. Kaiser bought AMC 327 engines from 63-67 (not a Chevy -- anyone who's seen one would know better -- AMC made a 327 from 56-66 for their cars, continued through 67 for Kaiser) in the big Wagoneer and pickups.

All AMC engines from 72 on, with the exception of the 2.5L four, use the same transmission bolt pattern, six or V-8. The trannys can interchange, but there are some caveats to consider. The AMC 2.5L replaced the GM Iron Duke 2.5L, which was only used from 80-83 in Jeeps and AMC cars -- it was a stop-gap until the AMC engine could be brought out. Supposedly because of a contract with GM to supply transmissions, AMC cast their engine with the small Chevy V-6 bolt pattern. That way all the 84-86 Cherokees could share the same transmission. AMC bought the 2.8L V-6 those years (what a joke, only marginally stronger than the AMC four!!) from GM until they had the EFI upgrade ready for their in-line six. Again, it was a stop-gap until the AMC engine was ready. When you're a small company you only have so much money for R&D. Launching the new Jeep as soon as possible was more important than waiting on an engine.

AMC didn't "do whatever" to move product. They did buy parts from other companies, but only a limited number of parts. If they could buy it cheaper than they could build their own, they did. Auto trannys for instance, were from GM in the early 50s (well, they were the only source for a while!), Borg Warner from 56-71, Chrysler from 72-87. A few other parts were purchased from other companies, but not a lot. AMC built most of the parts for the cars themselves. They also sold plastic parts and wiring harnesses to the other manufacturers for a few models. So it was a two way street. AMC bought more highly visible parts, thats all. I can name all the parts AMC bought from "big three" manufacturers -- it's not that many.
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