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PostPosted: Thu Apr 25, 2019 9:01 am 
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Turbo Slant 6
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Joined: Mon Aug 02, 2010 7:36 am
Posts: 850
Location: Rome, GA
Car Model*: 1963 Dart 270, 1980 D150
Supposed to have been pulled from an '81 pick up. Does it being a truck transmission make it a difficult swap into an A body? Do I need to keep looking for an A body 904?
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PostPosted: Thu Apr 25, 2019 10:50 am 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 13539
Location: Blacksburg, VA
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Yes, looks like a Slant 6 904. Should be a direct swap to any A-body. Assume you know about large/small crank hub/pilot hole and converter match up...

Lou

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PostPosted: Thu Apr 25, 2019 10:53 am 
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Turbo Slant 6
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Joined: Mon Aug 02, 2010 7:36 am
Posts: 850
Location: Rome, GA
Car Model*: 1963 Dart 270, 1980 D150
Yes I am aware of the input shaft sizes and such. That is one reason for the swap. So does it matter that it came from a truck? Still a direct swap?
I have a '63 Dart with push button 904. I am not using a 63 crank.

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PostPosted: Thu Apr 25, 2019 1:06 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 12343
Location: Fircrest, WA
Car Model*: 82 Ramcharger, 76 D100
The 81 904 will likely have more clutches than a car slant, a wide-ratio gearset, and it will be lockup. None of these are really a bad thing unless you are racing and don't like the larger RPM drop between 1st and second gears.


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PostPosted: Thu Apr 25, 2019 1:14 pm 
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Turbo Slant 6
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Joined: Mon Aug 02, 2010 7:36 am
Posts: 850
Location: Rome, GA
Car Model*: 1963 Dart 270, 1980 D150
The numbers are:
4058383
http://mymopar.com/downloads/transguide.pdf

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PostPosted: Thu Apr 25, 2019 1:38 pm 
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Turbo Slant 6
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Joined: Mon Aug 02, 2010 7:36 am
Posts: 850
Location: Rome, GA
Car Model*: 1963 Dart 270, 1980 D150
Is the rpm drop that significant? I am trying to build a relatively fast car so maybe I need to keep looking.

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PostPosted: Thu Apr 25, 2019 1:55 pm 
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Turbo Slant 6
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 871
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
According to Tom Hand's Torqueflite book, 4058383 is 1981 Dodge truck, 225, 904, wide ratio gear set, lock up converter.

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PostPosted: Thu Apr 25, 2019 2:16 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 12343
Location: Fircrest, WA
Car Model*: 82 Ramcharger, 76 D100
drgonzo wrote:
Is the rpm drop that significant? I am trying to build a relatively fast car so maybe I need to keep looking.


Third gear is 1:1 in both the older narrow gear ratio and the later wide ratio gearset.

Wide ratio- 2.74, 1.54, 1
Close ratio- 2.45, 1.45, 1

Your can figure out what that means for your gearing and acceleration and what it means in relation to your power band.


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PostPosted: Thu Apr 25, 2019 3:23 pm 
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Turbo Slant 6
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Joined: Mon Aug 02, 2010 7:36 am
Posts: 850
Location: Rome, GA
Car Model*: 1963 Dart 270, 1980 D150
I'm going to keep looking.

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