1966 engine with 1981 904A

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drauhut

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I have read 1967 and older slants cannot be used with 1968 and newer 904's without some modifications to end of crankshaft, or the plate..does anyone know if it just doesnt fit or whether it just works incorrectly?

Im asking because i have a 1966 engine( modified by other with very little info(casting number-2463430-17) and a 1981 904A (PK4202662X) ..i have put 200 miles or so on it, and previous owner said he had 600 miles on it.
 
The 67 and earlier Slants have a smaller crank register. 68 up are larger. Thus a newer 904, like yours the torque converter has a larger "snout" and won't fit into the earlier crank. Now the crank may have been machined to fit the newer converter, OR a custom converter was made. I mated a 71 904 to a 67 crank by having Hughes transmissions make a converter with the smaller snout. The front pumps are different along with the input shaft starting in 68 for the 904 transmissions both in the Slant and the V8.
 
The 67 and earlier Slants have a smaller crank register. 68 up are larger. Thus a newer 904, like yours the torque converter has a larger "snout" and won't fit into the earlier crank. Now the crank may have been machined to fit the newer converter, OR a custom converter was made. I mated a 71 904 to a 67 crank by having Hughes transmissions make a converter with the smaller snout. The front pumps are different along with the input shaft starting in 68 for the 904 transmissions both in the Slant and the V8.
S
 
Thx for replying.
So if im driving it, and it runs fine( had it to 70 mph) then its probable its been modified then, correct?
 
If not it wouldn't be driveable. Someone musta' did it right before you bought it. Have fun !
 
I would be worried if it were the other way around and they used a later motor with an early trans. But your situation sounds like someone already remedied the mismatch!
 
Cosgig is right. The opposite, you need a bushing for the crank to use the early trans. I've seen it done without but the flex plate will crack after awhile along with other things.
 
I would be worried if it were the other way around and they used a later motor with an early trans. But your situation sounds like someone already remedied the mismatch!
Thank you cosig..i appreciate the info
 
Cosgig is right. The opposite, you need a bushing for the crank to use the early trans. I've seen it done without but the flex plate will crack after awhile along with other things.

Wallered out the front pump on a car I bought with a 72 motor and the original 66 trans. And, it’s the original trans for the car, and coded for a HP application, so I feel the need to rebuild it.
 
Cosgig is right. The opposite, you need a bushing for the crank to use the early trans. I've seen it done without but the flex plate will crack after awhile along with other things.
Thx Darter6. That means my 1973 904 is a suitable back up
 
I once bought a dart from some guys who used a bunch of washers to try mate up the early motor with later trans, i was very confused but for $300 bucks what could i say.
 
the previous owner probably had a custom converter made to be able to mate the 66 block to the 68 and up trans, but if you have a later motor and early trans Charlie S sells the crank adapter.
 
I would be worried if it were the other way around and they used a later motor with an early trans. But your situation sounds like someone already remedied the mismatch!
Cosig- 65 barracuda said I should PM you about parts but your mailbox is full. This is the only way I thought of reaching you. I live in Michigan as well. Pm me if you get this.
 
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