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290 to t-4 or 904 questions

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Texas275 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Texas275 Quote  Post ReplyReply Direct Link To This Post Topic: 290 to t-4 or 904 questions
    Posted: Mar/29/2021 at 2:51pm

I have a 1966 bone stock 290 to put into a 70 Javelin that was a 6 cyl/manual.  I also have a t-4 or a 904 to back it up with.  Not looking to do any racing, simply a curser.  I am using the 290 and listed transmissions because they are what I have.

I know that I will need the V-8 crossmember, and the adaptor to attach a late trans (904) to the early motor.  I know I will need a 290 flywheel or flex plate depending on which way I go.

What I don't know is what else I would need for the T-4 like which bellhousing?

What transmission crossmember would I need for either application?

Any help or guidance would be greatly appreciated, Tom

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1982AMCConcord Quote  Post ReplyReply Direct Link To This Post Posted: Mar/29/2021 at 7:41pm
904 wouldn't work behind the 290. It's got the wrong crankshaft flange. You'll have to have a machine shop modify the face of the crankshaft flange to match the later transmission.

Not sure about the T-4 though.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Mar/29/2021 at 9:50pm
This is strictly from memory - so take this as such, but a T-4 and T-5 are the same case and interchangeable IN a late 80's Jeep.
The short V8 6.5" bellhousing from a later Jeep or AMC 87-89 will bolt to the 290 and the T-4 should bolt to that bellhousing.
Clutch will be a problem for a 66 but it can be fabricated or go hydraulic.
The 904 will need a crankshaft flange adaptor, bell housing spacer and transmission mount fabrication.
Both options will need a new driveshaft. 

The 1970 I6 has the same 8" bell housing and clutch as the V8 in 1970. The 290 would be a bolt in option except for the engine cross member.

What bellhousing, if any, do you have for the 290?

Also is this a 3 on the tree or a floor shifter car? That also starts to make economic decisions.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzzman72 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2021 at 5:50am
Originally posted by Trader Trader wrote:


The 1970 I6 has the same 8" bell housing and clutch as the V8 in 1970. The 290 would be a bolt in option except for the engine cross member.


Nope-nope-nope-nope-nope.

Until the '72 models came out with the 904 as an option, the 6 and the V8 bells were different.
Sixes through '71 had the starter on the opposite [left] side of the engine from the V8.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2021 at 6:31am
You would have to match balance a 304 (or 6cyl) 904 flex plate to the 290 flex plate then buy a adapter kit.
IMG_4014 by Rick Jones, on Flickr
Then you would have to rework the Rambler transmission cross member to adapt it to the 904.


Edited by SC397 - Mar/31/2021 at 8:00am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2021 at 7:56am
My mistake, thanks for the correction Buzzman72. It was 71 that they standardized the bells and not 70.

No that's wrong again. the 1971 258 used the standardized V8 bolt pattern and the 232 used it in 1972.
You could still get the drivers side starter on the 232 in 71.

Well now I'm going in circles. The 71 258 I6 AMC cars all/maybe had the smaller bellhousing and were burning up clutches.
Some time in 71 Jeep and IH were using the 258 and they could be found with the V8 bell, but not all. I don't have a Jeep TSM but the Jeep Forums state for 71 you had to look at the starting motor location to determine if you could easily drop in a 304/360 or not.
This must have been a running year change and the heavier Jeep and IH would definitely want the larger clutch.



Edited by Trader - Mar/30/2021 at 9:41am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Texas275 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2021 at 12:53pm
Thanks for the advice. The only bell I have now is attached to the 3-speed that came in the 70 Javelin, I think it is a T-14.  I knew I would need a driveshaft made for it.  

So to go with the T-4 I would need a 72 or later bell housing.  Would I need to modify/machine the bell or the trans case?

What clutch, pp, and bearing would I need to use? 

Would the flywheel, clutch, pp, from the 232 work; as long as I get it balanced for the 290?

Sorry for all the questions, but this car is gonna need a ton of work, so I'm trying to figure out what to keep, what to sell, and what I need to build.  Thanks again, Tom




Edited by Texas275 - Mar/30/2021 at 1:35pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2021 at 5:16pm
The T4, T5 and SR4 bellhousing is 6.3" to 6.4". The can be found on late 70's - early 80's AMC I6 or Jeeps. 72 and newer, all bellhousings will fit the engine. But not all bellhousings will fit all transmissions. There is a 87 to 89/90 Jeep short bellhousing that is made for multiple transmissions.
The T10 4 speed is an 8" bellhousing, that will not work for you. A Jeep with a Peugeot 5 speed, 86-89, bell housing will not work either.

The 232 had 2x different size clutches and flywheels.
 
You will need a clutch and pressure plate that fits the 290 -401, recommend a diaphragm clutch. Clutch and PP are neutral balance.
You need a 290 flywheel for balance.
The T4 TOB is the same as the T5, I'd look at Jeep parts of the era to pull this together as they are more plentiful.
The pilot bearing for the 290 would be the same as the T5 conversions, plenty to search on the Forum.

All this, and you have the 904, you may want to go SC397's route and use that, Last I priced a 290 flywheel, it was $400 US billet. They are not that easy to find any more.

You can find running 360's for the price of the 290 flywheel. The 904 will bolt right up - may be the easiest and cheaper route. Certainly stronger then the T4.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Texas275 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/31/2021 at 9:45am
If I could find a 360 at that price point, I would be all over it. That’s what I got in my 69 Javelin. Not any around me that I can find. I have a complete 290 carb to pan I would gladly trade for a 360!!😁

The 290 flywheel or flex plate will be my biggest expense in getting this motor in. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Apr/07/2021 at 7:00am
The multi pattern six cylinder bell housing started about 1979 and was used through 86 in Jeeps and Eagles.  Easy to ID -- there are 6-8 holes in the face where the trans bolts on instead of just four. It will mount the old style T-14 as well as the newer SR4/T-4/T5. It will even mount the old late 60s T-96 and other trannys, but the bearing retainer is a different diameter, so care must be taken to line the trans up properly. I did it by modifying an old SR4 retainer to fit a T-96, but that trans didn't last long behind a bigger six. It was a temporary measure until I found a stronger trans.
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