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M-12 to GM 700R4 Swap |
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6t8amxetc
AMC Addicted Joined: Mar/11/2008 Location: Washington State Status: Offline Points: 630 |
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That may be a good option. Some people may prefer the choices and selections afforded by using a very common transmission! Options are usually a good thing.
Edited by 6t8amxetc - Apr/04/2023 at 7:46am |
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Buzzman72
AMC Addicted Joined: Sep/15/2009 Location: Southern IN Status: Offline Points: 2713 |
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If you're dealing with a 290 or 343, you swap in a '72-up 304 or 360 crank and use the Novak or Advance Adapters kit to install the GM transmission. But the 390 is different because '72-up 401 cranks are already drawing premium money due to their rarity, compared to 304/360 availability.
And with a dwindling number of '68-'70 390s [and an already small number of '71-only 401s], the market simply isn't there to PROFITABLY design and sell a 390-to-THM adapter kit. It's a niche product for what's becoming a niche engine. Not a bad engine, mind you. Just an engine that was never produced in GM, Ford, or Chrysler numbers to start with.
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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RandyB
AMC Nut Joined: Aug/04/2020 Location: Florida Status: Offline Points: 458 |
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And people wonder why users leave this forum
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Randy B
68 Javelin SST 343 73 Charger Rallye 340 triple Blk |
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jblue1555
AMC Nut Joined: Sep/27/2009 Status: Offline Points: 280 |
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And the truth makes someone triggered again. He is correct in his statement which may not please some but that’s pretty common. If some had been around with no new products at all and nothing but who knows who , who might have that part no web to communicate they would be thankful
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Gadgetman1
AMC Apprentice Joined: Dec/19/2022 Location: Texas Status: Offline Points: 74 |
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I stepped away from this topic for awhile to get my engine ready for a rebuild. So, you’re saying that there may be other transmissions that will bolt up better that have an overdrive? Which ones & what make & years?
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6762 |
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All the information is posted in this thread. Just start at the beginning and work through it to make a list. Rehashing the complete thread from the beginning is likely not going to happen.
This is not meant to be sarcastic, but realistic.
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Gadgetman1
AMC Apprentice Joined: Dec/19/2022 Location: Texas Status: Offline Points: 74 |
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Never mind then - trying to make sense of this thread is like scuba diving in a mud hole!
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Thikstik
AMC Addicted Joined: Mar/20/2008 Location: Alabama Status: Offline Points: 1327 |
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So the 46RH and the 46 RE IF , from a Grand Chero 4.0, would fit a 1975 258? and would crank pilot holes and flex plates be compatable?
Regarding the designations, does the A-500/A 518 indicate that its a Chrysler trans with a non AMC bellhousing? Edited by Thikstik - Aug/18/2023 at 10:03pm |
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75 gremlin x, jeep 4.0 headed 258,
264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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No, I understand it fine. Its alot of you guys asking why it wont work. And its very simple. It all come to this. 1966 to 71 engines have a flat crankshaft flange. Which means there is no hub for the torque converter to go. The Borg Warner has a hub that is the size like a standard transmission. 1972 and later use the chrysler TF. Which uses a normal hub on the crankshaft, and the converter has a place to go in.and the flexplate is also different. Now if you dont understand what I said about this, then you have no business even working on a car then.
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Gadgetman1
AMC Apprentice Joined: Dec/19/2022 Location: Texas Status: Offline Points: 74 |
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I’m using a 401 crankshaft with a 72 Chrysler transmission, which solves my problem. It’s sad that everyone is all talk, but no one is fabricating parts to retrofit newer transmissions. It’s also sad that every reproduction part I have purchased so far is absolute crap!
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