4r70w output spline count?

[BeefCakeScout]

My google fu is lacking today. I know its the standard 6 bolt pattern, but can't find the spline count of the tailshaft. Any help?

 

[Turdle]

Maybe this thread will answer your question, or, cut to the chase-

http://www.explorerforum.com/forums/showthread.php?t=166726&highlight=4406+expedition

 

[snoranger]

I'm going to say 31 spline.... Just like almost every other full size ford 4x4 trans.

 

[BeefCakeScout]

I'm going to say 31 spline.... Just like almost every other full size ford 4x4 trans.

Therein lies the rub. If its a 31 spline round pattern, why doesn't everyone just go to an NP205?

 

[snoranger]

Therein lies the rub. If its a 31 spline round pattern, why doesn't everyone just go to an NP205?

1) It heavy... you need to build a rear support so you dont snap the back of the trans in half.

2) Poor low range gearing... Its only 1.98:1.

3) Its over-kill for the application... It may be bullet-proof, but you're not running enough power in a heavy vehicle to really need something that strong.

4) You have to grind away part of the T-case flange to clear the shift rail.

I'm sure there are people who are using one and are happy with it.

 

[BeefCakeScout]

1) It heavy... you need to build a rear support so you dont snap the back of the trans in half.

2) Poor low range gearing... Its only 1.98:1.

3) Its over-kill for the application... It may be bullet-proof, but you're not running enough power in a heavy vehicle to really need something that strong.

4) You have to grind away part of the T-case flange to clear the shift rail.

I'm sure there are people who are using one and are happy with it.

I prefer overkill on large parts. I live within 2 hours of the 'con and fordyce, plus a yearly trip to the hammers. I would much rather have parts failures on easily "trail fixed" parts. I know the 4R70W is a beast, so I am not worried about that. Plus, when its time to upgrade, I can go with common inputs for a STAK or ATLAS application. Thanks for the help guys