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I am thinking about going to an automatic, I know the case length on the 700R4 is 23.375, I cannot find out how long the adapter is to mount it to the Atlas. My atlas is a 23 spline input, will I have to swap the input out to make the conversion?

Thanks!

Yes I searched.... found plenty for the NP231!
 

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Unless I'm mistaken, the atlas should use the same adapter as the 300 case.

Novak 700r4 to 300 case.

As long as thats the case, the adapter is 3.4"
 

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been awhile since i fiddled with mine but i belive there is a 700 that will work that does not need a new output shaft. mine required one that i got from AA.
 

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I am about to do the same thing(4L60E to Atlas) there are 2 ways to do this.

1) get a 23 spline Atlas and order another output shaft($400 +/-) and get it installed($?) and the order an adapter and you are good.

2) get a 27 spline Atlas, order the adapter, order/make a spacer(3/4") and install.

this is from the tech at AA.

Good Luck,
JJ

NOTE: A 4L60E install will require a reluctor kit so it can work with the computer.
 
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